clinicaltrialsgov-mcp-server

Previous value: -"The exact queryLocn string sent upstream (city/state/country joined). Pass as locationQuery to clinicaltrials_search_studies to reproduce the location filter beyond the maxResults cap."New value: +"The exact queryLocn string sent upstream (city/state/country, multi-word components quoted, AND-joined). Pass as locationQuery to clinicaltrials_search_studies to reproduce the location filter beyond the maxResults cap."

Previous value: -"Machine-readable failure mode. Declared by this tool: `path_not_found`: The dot-notation path does not match any node in the field tree. `rate_limited`: ClinicalTrials.gov returned 429 after retry budget exhausted. Other values are possible when a failure originates below the handler."New value: +"Machine-readable failure mode. Declared by this tool: `blank_value`: The selected mode's required argument was supplied with a whitespace-only value. `mode_mismatch`: An argument belonging to a different mode was supplied alongside the selected mode. `mode_requires`: The selected mode's required argument was omitted. `path_not_found`: The dot-notation path does not match any node in the field tree. `rate_limited`: ClinicalTrials.gov returned 429 after retry budget exhausted. Other values are possible when a failure originates below the handler."

Previous value: -[
-  "path_not_found",
-  "rate_limited"
-]New value: +[
+  "blank_value",
+  "mode_mismatch",
+  "mode_requires",
+  "path_not_found",
+  "rate_limited"
+]

Previous value: -"One entry per requested field: canonical path, PascalCase piece name, data type, missing/unique counts, and top values with study counts (or trueCount/falseCount for BOOLEAN fields)."New value: +"One entry per requested field: canonical path, PascalCase piece name, data type, and the statistics variant that type carries — top values with study counts plus unique/longest for ENUM/STRING, trueCount/falseCount for BOOLEAN, min/max/avg for INTEGER/NUMBER, min/max/formats for DATE."

Added value: +{
+  "description": "Mean of the recorded values. Present for INTEGER/NUMBER fields.",
+  "type": "number"
+}

Added value: +{
+  "description": "Date patterns this field is recorded in. Present for DATE fields; more than one means the field mixes precisions across studies.",
+  "items": {
+    "description": "A date pattern, e.g. \"yyyy-MM-dd\".",
+    "type": "string"
+  },
+  "type": "array"
+}

Added value: +{
+  "additionalProperties": false,
+  "description": "Longest recorded value with its length and a study carrying it. Present for STRING fields only.",
+  "properties": {
+    "length": {
+      "description": "Its length in characters.",
+      "type": "number"
+    },
+    "nctId": {
+      "description": "NCT ID of a study carrying it.",
+      "type": "string"
+    },
+    "value": {
+      "description": "The longest recorded value.",
+      "type": "string"
+    }
+  },
+  "required": [
+    "value",
+    "length",
+    "nctId"
+  ],
+  "type": "object"
+}

Added value: +{
+  "anyOf": [
+    {
+      "description": "Largest value of an INTEGER/NUMBER field.",
+      "type": "number"
+    },
+    {
+      "description": "Latest value of a DATE field, at the precision recorded.",
+      "type": "string"
+    }
+  ],
+  "description": "Largest recorded value — a number for INTEGER/NUMBER, a date string for DATE."
+}

Added value: +{
+  "anyOf": [
+    {
+      "description": "Smallest value of an INTEGER/NUMBER field.",
+      "type": "number"
+    },
+    {
+      "description": "Earliest value of a DATE field, at the precision recorded — a partial date such as \"1900-01\" stays partial.",
+      "type": "string"
+    }
+  ],
+  "description": "Smallest recorded value — a number for INTEGER/NUMBER, a date string for DATE."
+}

Previous value: -"True when the field is array-typed (a study can carry several values, e.g. Phase, Condition), so the per-value studiesCount buckets sum above the study total. Use to avoid computing a percentage against the corpus."New value: +"True when the field is repeated — array-typed itself (Phase, Condition) or nested under a repeated object (LocationCountry, one per site) — so a study can carry several values and the per-value studiesCount buckets sum above the study total. Use to avoid computing a percentage against the corpus."

Previous value: -"One or more NCT IDs (max 20) — an empty list is rejected. E.g., \"NCT12345678\" or [\"NCT12345678\", \"NCT87654321\"]. Use summary=true for large batches to avoid large payloads."New value: +"One or more NCT IDs (max 20) — an empty list is rejected, and a repeated ID collapses to one results entry in first-occurrence order. E.g., \"NCT12345678\" or [\"NCT12345678\", \"NCT87654321\"]. Use summary=true for large batches to avoid large payloads."

Added value: +{
+  "description": "Optional index of the first other (non-serious) adverse event to return, in upstream order. Omit or 0 to start at the first. Pages independently of seriousEventOffset and pairs with adverseEventLimit. Continue from filtersApplied.nextOtherEventOffset until that field is absent. Applied to every study in the call. Rejected with summary: true or when sections excludes adverseEvents.",
+  "maximum": 9007199254740991,
+  "minimum": 0,
+  "type": "integer"
+}

Added value: +{
+  "description": "Optional index of the first outcome measure to return, in the order ClinicalTrials.gov publishes them. Omit or 0 to start at the first. Pair with outcomeLimit to page a long list: each response reports filtersApplied.nextOutcomeOffset for the study, and the list is exhausted when that field is absent. Applied to every study in the call. An offset at or past the end returns an empty list with filtersApplied.totalOutcomes stating the upstream length, not an error. Rejected with summary: true or when sections excludes outcomes.",
+  "maximum": 9007199254740991,
+  "minimum": 0,
+  "type": "integer"
+}

Added value: +{
+  "description": "Optional index of the first serious adverse event to return, in upstream order. Omit or 0 to start at the first. Pages independently of otherEventOffset — the two lists have uncorrelated lengths — and pairs with adverseEventLimit, which bounds each list separately. Continue from filtersApplied.nextSeriousEventOffset until that field is absent. Applied to every study in the call. Rejected with summary: true or when sections excludes adverseEvents.",
+  "maximum": 9007199254740991,
+  "minimum": 0,
+  "type": "integer"
+}

Previous value: -"Return condensed summaries instead of full data. Full mode renders every row and field on both output channels, so a large results set can exceed 500KB per study; summary mode reduces that to ~5KB. Summaries include outcome titles, types, timeframes, group counts, and top-level stats — omitting individual measurements, analyses, and per-group data. For a middle ground, keep full mode and cap the two lists that carry the bulk with outcomeLimit / adverseEventLimit."New value: +"Return condensed summaries instead of full data. Full mode renders every row and field on both output channels, so a large results set can exceed 500KB per study; summary mode typically cuts that to a few KB, scaling with the measure count rather than to a fixed ceiling. An outcome summary keeps the title, type, timeframe, paramType, dispersionType, unit, group/class counts, per-group denominators, one statistical analysis, and a top-line projection of a single class/category cell — labelled with the class and category titles it came from and a count of the siblings it omits. The measurements outside that cell and the remaining analyses are dropped; re-run with summary=false to reach them. For a middle ground, keep full mode and cap the two lists that carry the bulk with outcomeLimit / adverseEventLimit."

Previous value: -"Machine-readable failure mode. Declared by this tool: `blank_value`: A parameter was supplied with a blank, whitespace-only, or empty-list value. `rate_limited`: ClinicalTrials.gov returned 429 after retry budget exhausted. Other values are possible when a failure originates below the handler."New value: +"Machine-readable failure mode. Declared by this tool: `blank_value`: A parameter was supplied with a blank, whitespace-only, or empty-list value. `offset_not_applicable`: An offset was supplied for a list this call does not return — summary mode returns a condensed projection rather than a bounded window, or the sections filter excludes the offset’s own section. `rate_limited`: ClinicalTrials.gov returned 429 after retry budget exhausted. Other values are possible when a failure originates below the handler."

Previous value: -[
-  "blank_value",
-  "rate_limited"
-]New value: +[
+  "blank_value",
+  "offset_not_applicable",
+  "rate_limited"
+]

Added value: +{
+  "description": "The canonical NCT identifier of the study that answered — present only when the requested nctId is a previous (alias) ID pointing at a different record. Absent means nctId is already canonical. Requesting an alias and its own canonical ID together returns one entry per requested ID, both carrying the same study.",
+  "type": "string"
+}

Previous value: -"What a cap trimmed on this study — present only when a cap actually reduced a list. Absent means the payload is the complete upstream set for the requested sections."New value: +"What the outcomeLimit / adverseEventLimit caps and the outcomeOffset / seriousEventOffset / otherEventOffset offsets trimmed on this study, plus the next offset for each list left short. Present only when a bound actually reduced a list — a window that started at zero and reached the end trimmed nothing. Absent means the payload is the complete upstream set for the requested sections. Offsets apply uniformly to every study in the call, so continuation is reported per study: each exhausts its lists at a different index."

Previous value: -"Echo of the adverseEventLimit input — present only when the cap trimmed a list."New value: +"Echo of the adverseEventLimit input — present only when the cap cut events off the end of a window. Which list it cut is named by that list’s own next offset."

Added value: +{
+  "description": "The otherEventOffset to request next for this study — present only when other events remain past the window. Absent means this study’s other event list is exhausted.",
+  "maximum": 9007199254740991,
+  "minimum": -9007199254740991,
+  "type": "integer"
+}

Added value: +{
+  "description": "The outcomeOffset to request next for this study — present only when measures remain past the window. Absent means this study’s outcome list is exhausted.",
+  "maximum": 9007199254740991,
+  "minimum": -9007199254740991,
+  "type": "integer"
+}

Added value: +{
+  "description": "The seriousEventOffset to request next for this study — present only when serious events remain past the window. Absent means this study’s serious event list is exhausted.",
+  "maximum": 9007199254740991,
+  "minimum": -9007199254740991,
+  "type": "integer"
+}

Added value: +{
+  "description": "Echo of the otherEventOffset input — present only when it skipped events before the window.",
+  "maximum": 9007199254740991,
+  "minimum": -9007199254740991,
+  "type": "integer"
+}

Previous value: -"Echo of the outcomeLimit input — present only when the cap trimmed the list."New value: +"Echo of the outcomeLimit input — present only when the cap cut measures off the end of the window."

Added value: +{
+  "description": "Echo of the outcomeOffset input — present only when it skipped measures before the window.",
+  "maximum": 9007199254740991,
+  "minimum": -9007199254740991,
+  "type": "integer"
+}

Added value: +{
+  "description": "Echo of the seriousEventOffset input — present only when it skipped events before the window.",
+  "maximum": 9007199254740991,
+  "minimum": -9007199254740991,
+  "type": "integer"
+}

Previous value: -"Upstream other adverse event count before adverseEventLimit trimmed the list."New value: +"Upstream other adverse event count, before the bounds trimmed the list."

Previous value: -"Upstream outcome measure count before outcomeLimit trimmed the list."New value: +"Upstream outcome measure count, before the bounds trimmed the list."

Previous value: -"Upstream serious adverse event count before adverseEventLimit trimmed the list."New value: +"Upstream serious adverse event count, before the bounds trimmed the list."

Previous value: -"NCT identifier."New value: +"The NCT identifier as requested, echoed verbatim. When it is a previous (alias) ID, ClinicalTrials.gov answers with the canonical record and canonicalNctId names it."

Previous value: -"Outcome measures with per-group statistics. Summary mode (compact): type, title, timeFrame, paramType, unitOfMeasure, group/class counts, plus topStats (per-group measurements) and topAnalysis (statisticalMethod, pValue, paramType/Value, ciPctValue/Lower/Upper, nonInferiorityType, groupIds — lifted from analyses[0]) when present. Full mode (default): adds raw groups, classes, categories, measurements, and analyses arrays."New value: +"Outcome measures with per-group statistics. Summary mode (compact): type, title, timeFrame, paramType, dispersionType, unitOfMeasure, group/class counts, denoms (per-group denominators keyed by group title), topStats (the per-group cells of one class/category — each carrying the upstream value verbatim, including an NA/NR sentinel, plus spread, lowerLimit/upperLimit, and the record’s own comment when present), topStatsFrom (classTitle / categoryTitle naming where that cell came from, with omittedClasses / omittedCategories counts and a note pointing at summary=false when siblings were dropped), and topAnalysis (statisticalMethod, pValue, paramType/Value, ciPctValue/Lower/Upper, nonInferiorityType, groupIds — lifted from analyses[0]) when present. Full mode (default): adds raw groups, classes, categories, measurements, and analyses arrays."

Previous value: -"True when a cap trimmed a list on at least one study; absent when nothing was trimmed, matching filtersApplied one level down. Which study and which list is named in that study’s filtersApplied."New value: +"True when a bound — a cap or an offset — trimmed a list on at least one study; absent when nothing was trimmed, matching filtersApplied one level down. Which study, which list, and where to resume is named in that study’s filtersApplied."

Previous value: -"Geographic proximity filter. Format: distance(lat,lon,radius), where radius carries a `mi` or `km` suffix — e.g. \"distance(47.6062,-122.3321,50mi)\" for studies within 50 miles of Seattle. Always include the suffix: a bare radius is accepted upstream but interpreted as meters, which silently matches almost nothing. When set, each study's locations are re-sorted by proximity to the center so the nearest matched site leads, annotated with its distance in miles; the full location list is preserved."New value: +"Geographic proximity filter. Format: distance(lat,lon,radius), where radius carries a `mi` or `km` suffix — e.g. \"distance(47.6062,-122.3321,50mi)\" for studies within 50 miles of Seattle. The suffix is required: a radius with no unit is rejected, as are a non-positive radius, a latitude outside [-90, 90], and a longitude outside [-180, 180]. When set, each study's locations are re-sorted by proximity to the center so the nearest matched site leads, annotated with its distance in miles; the full location list is preserved."

Previous value: -"Recovery guidance when no studies matched — echoes the constraint and suggests how to broaden. Absent on pages with results."New value: +"Recovery guidance when no studies matched — echoes the constraint and suggests how to broaden, and names nctIds as part of the unmatched criteria when an ID list was supplied. Absent on pages with results, and on an exhausted continuation page, where the cohort already matched and there is nothing to broaden."

Added value: +{
+  "description": "True when this call supplied a pageToken and the continuation page came back empty — the walk is finished and no further pages exist. Absent on every other response, including an empty first page, which is an unmatched search rather than exhausted pagination.",
+  "type": "boolean"
+}

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Added value: +false

Added value: +false

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Added value: +[
+  {
+    "not": {
+      "required": [
+        "error"
+      ]
+    },
+    "required": [
+      "studies",
+      "searchCriteria",
+      "funnel"
+    ]
+  },
+  {
+    "required": [
+      "error"
+    ]
+  }
+]

Added value: +{
+  "additionalProperties": {},
+  "description": "Present when the call failed. Absent on success.",
+  "properties": {
+    "code": {
+      "description": "JSON-RPC error code for this failure.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    },
+    "data": {
+      "additionalProperties": {},
+      "properties": {
+        "reason": {
+          "description": "Machine-readable failure mode. Declared by this tool: `blank_value`: A parameter was supplied with a blank, whitespace-only, or empty-list value. `rate_limited`: ClinicalTrials.gov returned 429 after retry budget exhausted. Other values are possible when a failure originates below the handler.",
+          "examples": [
+            "blank_value",
+            "rate_limited"
+          ],
+          "type": "string"
+        },
+        "recovery": {
+          "additionalProperties": {},
+          "description": "Actionable next step for the caller.",
+          "properties": {
+            "hint": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "hint"
+          ],
+          "type": "object"
+        },
+        "retryable": {
+          "description": "Whether retrying may succeed.",
+          "type": "boolean"
+        }
+      },
+      "type": "object"
+    },
+    "message": {
+      "description": "Human-readable description of what went wrong.",
+      "type": "string"
+    }
+  },
+  "required": [
+    "code",
+    "message"
+  ],
+  "type": "object"
+}

Removed value: -[
-  "studies",
-  "searchCriteria",
-  "funnel"
-]

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Added value: +false

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Added value: +[
+  {
+    "not": {
+      "required": [
+        "error"
+      ]
+    },
+    "required": [
+      "fields",
+      "totalFields"
+    ]
+  },
+  {
+    "required": [
+      "error"
+    ]
+  }
+]

Added value: +{
+  "additionalProperties": {},
+  "description": "Present when the call failed. Absent on success.",
+  "properties": {
+    "code": {
+      "description": "JSON-RPC error code for this failure.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    },
+    "data": {
+      "additionalProperties": {},
+      "properties": {
+        "reason": {
+          "description": "Machine-readable failure mode. Declared by this tool: `path_not_found`: The dot-notation path does not match any node in the field tree. `rate_limited`: ClinicalTrials.gov returned 429 after retry budget exhausted. Other values are possible when a failure originates below the handler.",
+          "examples": [
+            "path_not_found",
+            "rate_limited"
+          ],
+          "type": "string"
+        },
+        "recovery": {
+          "additionalProperties": {},
+          "description": "Actionable next step for the caller.",
+          "properties": {
+            "hint": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "hint"
+          ],
+          "type": "object"
+        },
+        "retryable": {
+          "description": "Whether retrying may succeed.",
+          "type": "boolean"
+        }
+      },
+      "type": "object"
+    },
+    "message": {
+      "description": "Human-readable description of what went wrong.",
+      "type": "string"
+    }
+  },
+  "required": [
+    "code",
+    "message"
+  ],
+  "type": "object"
+}

Removed value: -[
-  "fields",
-  "totalFields"
-]

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Added value: +false

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Added value: +[
+  {
+    "not": {
+      "required": [
+        "error"
+      ]
+    },
+    "required": [
+      "fieldStats"
+    ]
+  },
+  {
+    "required": [
+      "error"
+    ]
+  }
+]

Added value: +{
+  "additionalProperties": {},
+  "description": "Present when the call failed. Absent on success.",
+  "properties": {
+    "code": {
+      "description": "JSON-RPC error code for this failure.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    },
+    "data": {
+      "additionalProperties": {},
+      "properties": {
+        "reason": {
+          "description": "Machine-readable failure mode. Declared by this tool: `blank_value`: A parameter was supplied with a blank, whitespace-only, or empty-list value. `field_invalid`: A requested field name is not a valid PascalCase piece name. `rate_limited`: ClinicalTrials.gov returned 429 after retry budget exhausted. Other values are possible when a failure originates below the handler.",
+          "examples": [
+            "blank_value",
+            "field_invalid",
+            "rate_limited"
+          ],
+          "type": "string"
+        },
+        "recovery": {
+          "additionalProperties": {},
+          "description": "Actionable next step for the caller.",
+          "properties": {
+            "hint": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "hint"
+          ],
+          "type": "object"
+        },
+        "retryable": {
+          "description": "Whether retrying may succeed.",
+          "type": "boolean"
+        }
+      },
+      "type": "object"
+    },
+    "message": {
+      "description": "Human-readable description of what went wrong.",
+      "type": "string"
+    }
+  },
+  "required": [
+    "code",
+    "message"
+  ],
+  "type": "object"
+}

Removed value: -[
-  "fieldStats"
-]

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Added value: +false

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Added value: +[
+  {
+    "not": {
+      "required": [
+        "error"
+      ]
+    },
+    "required": [
+      "totalCount"
+    ]
+  },
+  {
+    "required": [
+      "error"
+    ]
+  }
+]

Added value: +{
+  "additionalProperties": {},
+  "description": "Present when the call failed. Absent on success.",
+  "properties": {
+    "code": {
+      "description": "JSON-RPC error code for this failure.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    },
+    "data": {
+      "additionalProperties": {},
+      "properties": {
+        "reason": {
+          "description": "Machine-readable failure mode. Declared by this tool: `blank_value`: A parameter was supplied with a blank, whitespace-only, or empty-list value. `field_invalid`: A field name in the advanced filter or AREA[] expression is invalid (often a module name instead of a piece name). `enum_invalid`: statusFilter or phaseFilter contains a value ClinicalTrials.gov does not accept. `query_parse_error`: A free-text query or advancedFilter expression uses syntax the upstream Essie parser rejects — typically a `[` or `]` outside an AREA[…] / RANGE[…] expression, an unmatched `(` / `)`, or an unterminated quote in a query/conditionQuery/etc. value. `rate_limited`: ClinicalTrials.gov returned 429 after retry budget exhausted. Other values are possible when a failure originates below the handler.",
+          "examples": [
+            "blank_value",
+            "field_invalid",
+            "enum_invalid",
+            "query_parse_error",
+            "rate_limited"
+          ],
+          "type": "string"
+        },
+        "recovery": {
+          "additionalProperties": {},
+          "description": "Actionable next step for the caller.",
+          "properties": {
+            "hint": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "hint"
+          ],
+          "type": "object"
+        },
+        "retryable": {
+          "description": "Whether retrying may succeed.",
+          "type": "boolean"
+        }
+      },
+      "type": "object"
+    },
+    "message": {
+      "description": "Human-readable description of what went wrong.",
+      "type": "string"
+    }
+  },
+  "required": [
+    "code",
+    "message"
+  ],
+  "type": "object"
+}

Removed value: -[
-  "totalCount"
-]

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Added value: +false

Added value: +false

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Added value: +[
+  {
+    "not": {
+      "required": [
+        "error"
+      ]
+    },
+    "required": [
+      "study",
+      "filtersApplied"
+    ]
+  },
+  {
+    "required": [
+      "error"
+    ]
+  }
+]

Added value: +{
+  "additionalProperties": {},
+  "description": "Present when the call failed. Absent on success.",
+  "properties": {
+    "code": {
+      "description": "JSON-RPC error code for this failure.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    },
+    "data": {
+      "additionalProperties": {},
+      "properties": {
+        "reason": {
+          "description": "Machine-readable failure mode. Declared by this tool: `study_not_found`: The provided NCT ID does not match any study at ClinicalTrials.gov. `rate_limited`: ClinicalTrials.gov returned 429 after retry budget exhausted. Other values are possible when a failure originates below the handler.",
+          "examples": [
+            "study_not_found",
+            "rate_limited"
+          ],
+          "type": "string"
+        },
+        "recovery": {
+          "additionalProperties": {},
+          "description": "Actionable next step for the caller.",
+          "properties": {
+            "hint": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "hint"
+          ],
+          "type": "object"
+        },
+        "retryable": {
+          "description": "Whether retrying may succeed.",
+          "type": "boolean"
+        }
+      },
+      "type": "object"
+    },
+    "message": {
+      "description": "Human-readable description of what went wrong.",
+      "type": "string"
+    }
+  },
+  "required": [
+    "code",
+    "message"
+  ],
+  "type": "object"
+}

Removed value: -[
-  "study",
-  "filtersApplied"
-]

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Added value: +false

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Added value: +[
+  {
+    "not": {
+      "required": [
+        "error"
+      ]
+    },
+    "required": [
+      "results"
+    ]
+  },
+  {
+    "required": [
+      "error"
+    ]
+  }
+]

Added value: +{
+  "additionalProperties": {},
+  "description": "Present when the call failed. Absent on success.",
+  "properties": {
+    "code": {
+      "description": "JSON-RPC error code for this failure.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    },
+    "data": {
+      "additionalProperties": {},
+      "properties": {
+        "reason": {
+          "description": "Machine-readable failure mode. Declared by this tool: `blank_value`: A parameter was supplied with a blank, whitespace-only, or empty-list value. `rate_limited`: ClinicalTrials.gov returned 429 after retry budget exhausted. Other values are possible when a failure originates below the handler.",
+          "examples": [
+            "blank_value",
+            "rate_limited"
+          ],
+          "type": "string"
+        },
+        "recovery": {
+          "additionalProperties": {},
+          "description": "Actionable next step for the caller.",
+          "properties": {
+            "hint": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "hint"
+          ],
+          "type": "object"
+        },
+        "retryable": {
+          "description": "Whether retrying may succeed.",
+          "type": "boolean"
+        }
+      },
+      "type": "object"
+    },
+    "message": {
+      "description": "Human-readable description of what went wrong.",
+      "type": "string"
+    }
+  },
+  "required": [
+    "code",
+    "message"
+  ],
+  "type": "object"
+}

Removed value: -[
-  "results"
-]

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Added value: +false

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Added value: +[
+  {
+    "not": {
+      "required": [
+        "error"
+      ]
+    },
+    "required": [
+      "studies"
+    ]
+  },
+  {
+    "required": [
+      "error"
+    ]
+  }
+]

Added value: +{
+  "additionalProperties": {},
+  "description": "Present when the call failed. Absent on success.",
+  "properties": {
+    "code": {
+      "description": "JSON-RPC error code for this failure.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    },
+    "data": {
+      "additionalProperties": {},
+      "properties": {
+        "reason": {
+          "description": "Machine-readable failure mode. Declared by this tool: `blank_value`: A parameter was supplied with a blank, whitespace-only, or empty-list value. `ids_not_found`: One or more NCT IDs in the nctIds filter are not present at ClinicalTrials.gov. `field_invalid`: A field name in the fields parameter or AREA[] expression is invalid (often a module name instead of a piece name). `enum_invalid`: statusFilter or phaseFilter contains a value ClinicalTrials.gov does not accept. `query_parse_error`: A free-text query or advancedFilter expression uses syntax the upstream Essie parser rejects — typically a `[` or `]` outside an AREA[…] / RANGE[…] expression, an unmatched `(` / `)`, or an unterminated quote in a query/conditionQuery/etc. value. `geo_invalid`: geoFilter is not a well-formed distance(lat,lon,radius) expression. `sort_invalid`: sort is not FieldName:asc / FieldName:desc, or names more than 2 fields. `rate_limited`: ClinicalTrials.gov returned 429 after retry budget exhausted. Other values are possible when a failure originates below the handler.",
+          "examples": [
+            "blank_value",
+            "ids_not_found",
+            "field_invalid",
+            "enum_invalid",
+            "query_parse_error",
+            "geo_invalid",
+            "sort_invalid",
+            "rate_limited"
+          ],
+          "type": "string"
+        },
+        "recovery": {
+          "additionalProperties": {},
+          "description": "Actionable next step for the caller.",
+          "properties": {
+            "hint": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "hint"
+          ],
+          "type": "object"
+        },
+        "retryable": {
+          "description": "Whether retrying may succeed.",
+          "type": "boolean"
+        }
+      },
+      "type": "object"
+    },
+    "message": {
+      "description": "Human-readable description of what went wrong.",
+      "type": "string"
+    }
+  },
+  "required": [
+    "code",
+    "message"
+  ],
+  "type": "object"
+}

Removed value: -[
-  "studies"
-]

Removed value: -1

Added value: +{
+  "default": 10,
+  "description": "Cap on the sites returned per candidate. Each candidate keeps only the sites matching the requested location at the narrowest level that matched (city, else state, else country), capped at this many; the rest of the study's registered sites are omitted. The cap governs those matched sites — when none of them is recruiting, the candidate's nearest recruiting site is added on top of it, so a candidate can carry one site more than this. Raise it to see more nearby sites, or fetch the complete site list with clinicaltrials_get_study_record. Each candidate reports totalLocations / matchedLocations / locationsTruncated / nearestRecruitingSiteAdded in locationSummary only when the bound actually dropped sites.",
+  "maximum": 500,
+  "minimum": 1,
+  "type": "integer"
+}

Previous value: -"Matching studies with eligibility and location fields."New value: +"Matching studies with eligibility and location fields. Each candidate's protocolSection.contactsLocationsModule.locations is BOUNDED to the sites matching the requested location (capped at locationLimit) plus, when none of those is recruiting, the candidate's nearest recruiting site — not the study's full registered site list. A candidate whose sites were bounded also carries a top-level locationSummary object — { totalLocations, matchedLocations, locationsTruncated, nearestRecruitingSiteAdded?, retrieveFullStudyWith } — absent when nothing was dropped; nearestRecruitingSiteAdded is present only when that extra site was added. Fetch a study's complete record and site list with clinicaltrials_get_study_record."

Added value: +{
+  "description": "Total fields matching the query before the limit cap was applied (search mode only). Compare against `shown` to size a follow-up limit, or to see that a capped result set is barely over the cap rather than hundreds deep.",
+  "type": "number"
+}

Previous value: -[
-  {
-    "description": "A single PascalCase field name.",
-    "type": "string"
-  },
-  {
-    "description": "Multiple PascalCase field names (at least one required).",
-    "items": {
-      "type": "string"
-    },
-    "minItems": 1,
-    "type": "array"
-  }
-]New value: +[
+  {
+    "description": "A single PascalCase field name.",
+    "type": "string"
+  },
+  {
+    "description": "Multiple PascalCase field names (at least one required).",
+    "items": {
+      "type": "string"
+    },
+    "type": "array"
+  }
+]

Previous value: -"PascalCase field name(s) to get value statistics for. Examples: OverallStatus, Phase, StudyType, Sex, LeadSponsorClass. Use clinicaltrials_get_field_definitions with a query to find more field names."New value: +"PascalCase field name(s) to get value statistics for — an empty list is rejected, not treated as \"every field\". Examples: OverallStatus, Phase, StudyType, Sex, LeadSponsorClass. Use clinicaltrials_get_field_definitions with a query to find more field names."

Previous value: -"Condition/disease-specific search. E.g., \"Type 2 Diabetes\", \"non-small cell lung cancer\". Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."New value: +"Condition/disease-specific search. E.g., \"Type 2 Diabetes\", \"non-small cell lung cancer\". Matches Condition, BriefTitle, OfficialTitle, ConditionMeshTerm, ConditionAncestorTerm, Keyword, and NCTId. ConditionAncestorTerm is the MeSH umbrella above the conditions a study itself lists, so results run broader than those lists — a study can match a parent term it never names. Plain words plus AND/OR/NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression, which this parameter accepts; a stray bracket fails. `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"Intervention/treatment search. E.g., \"pembrolizumab\", \"cognitive behavioral therapy\". Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."New value: +"Intervention/treatment search. E.g., \"pembrolizumab\", \"cognitive behavioral therapy\". Matches InterventionName, InterventionType, ArmGroupType, InterventionOtherName, BriefTitle, OfficialTitle, ArmGroupLabel, InterventionMeshTerm, Keyword, InterventionAncestorTerm, InterventionDescription, and ArmGroupDescription. InterventionAncestorTerm is the MeSH umbrella above the interventions a study itself lists, so results run broader than those lists. Plain words plus AND/OR/NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression, which this parameter accepts; a stray bracket fails. `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"Location search — city, state, country, or facility name. Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."New value: +"Location search — city, state, country, or facility name. Matches LocationCity, LocationState, LocationCountry, LocationFacility, and LocationZip; a study matches when any of its sites does. Plain words plus AND/OR/NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression, which this parameter accepts; a stray bracket fails. `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"Search within outcome measure fields. Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."New value: +"Search within outcome measure fields. Matches PrimaryOutcomeMeasure, SecondaryOutcomeMeasure, OtherOutcomeMeasure, and OutcomeMeasureTitle, plus their description counterparts PrimaryOutcomeDescription, SecondaryOutcomeDescription, OtherOutcomeDescription, OutcomeMeasureDescription, and OutcomeMeasurePopulationDescription — so a term appearing only in outcome prose still matches. Plain words plus AND/OR/NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression, which this parameter accepts; a stray bracket fails. `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"Filter by trial phase. Values: EARLY_PHASE1, PHASE1, PHASE2, PHASE3, PHASE4, NA."New value: +"Filter by trial phase. Omit to count all phases — an empty list is rejected, not treated as \"no filter\". Values: EARLY_PHASE1, PHASE1, PHASE2, PHASE3, PHASE4, NA."

Previous value: -"General free-text search across all fields. Plain words plus AND, OR, NOT. `[ ]` are reserved (advancedFilter AREA[] only); `( )` group sub-expressions and work when matched; `,` acts as AND. For field-scoped searches, use the dedicated *Query parameters (conditionQuery, interventionQuery, etc.) or advancedFilter with AREA[FieldName]value."New value: +"General free-text search across all fields. Runs the 57-field relevance search ClinicalTrials.gov publishes for this parameter — NCTId, NCTIdAlias, OrgStudyId, SecondaryId, Acronym, BriefTitle, OfficialTitle, Condition, InterventionName, InterventionOtherName, Phase, StdAge, StudyType, BriefSummary, outcome measures and their descriptions, LeadSponsorName, CollaboratorName, the Location* fields, the Design* fields, and the ConditionAncestorTerm/InterventionAncestorTerm MeSH umbrellas — so a hit need not carry your term in the field you had in mind. Plain words plus AND, OR, NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression — those work here as well as in advancedFilter, so AREA[Phase]PHASE2 is accepted in this parameter; a stray bracket fails. `( )` group sub-expressions and work when matched; `,` acts as AND. The dedicated *Query parameters (conditionQuery, interventionQuery, etc.) scope a search to one field."

Previous value: -"Sponsor/collaborator name search. Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."New value: +"Sponsor/collaborator name search. Matches LeadSponsorName, CollaboratorName, and OrgFullName. Plain words plus AND/OR/NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression, which this parameter accepts; a stray bracket fails. `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"Filter by study status. Values: RECRUITING, COMPLETED, ACTIVE_NOT_RECRUITING, NOT_YET_RECRUITING, ENROLLING_BY_INVITATION, SUSPENDED, TERMINATED, WITHDRAWN, UNKNOWN, WITHHELD, NO_LONGER_AVAILABLE, AVAILABLE, APPROVED_FOR_MARKETING, TEMPORARILY_NOT_AVAILABLE."New value: +"Filter by study status. Omit to count all statuses — an empty list is rejected, not treated as \"no filter\". Values: RECRUITING, COMPLETED, ACTIVE_NOT_RECRUITING, NOT_YET_RECRUITING, ENROLLING_BY_INVITATION, SUSPENDED, TERMINATED, WITHDRAWN, UNKNOWN, WITHHELD, NO_LONGER_AVAILABLE, AVAILABLE, APPROVED_FOR_MARKETING, TEMPORARILY_NOT_AVAILABLE."

Previous value: -"Search within study titles and acronyms only. Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."New value: +"Search within study titles and acronyms only. Matches Acronym, BriefTitle, and OfficialTitle. Plain words plus AND/OR/NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression, which this parameter accepts; a stray bracket fails. `( )` group sub-expressions when matched; `,` acts as AND."

Added value: +{
+  "description": "Optional cap on the number of serious and other adverse events returned per study, applied to each list separately in upstream order. Omit for no cap (every event). Applies to full mode only — summary mode already ranks the top 20 by participants affected. Event groups are never capped. Upstream totals preserved in filtersApplied.totalSeriousEvents / totalOtherEvents only when the cap trims a list.",
+  "maximum": 500,
+  "minimum": 1,
+  "type": "integer"
+}

Previous value: -[
-  {
-    "description": "A single NCT ID.",
-    "pattern": "^NCT\\d{8}$",
-    "type": "string"
-  },
-  {
-    "description": "Multiple NCT IDs (max 20).",
-    "items": {
-      "pattern": "^NCT\\d{8}$",
-      "type": "string"
-    },
-    "maxItems": 20,
-    "minItems": 1,
-    "type": "array"
-  }
-]New value: +[
+  {
+    "description": "A single NCT ID.",
+    "pattern": "^NCT\\d{8}$",
+    "type": "string"
+  },
+  {
+    "description": "Multiple NCT IDs (max 20).",
+    "items": {
+      "pattern": "^NCT\\d{8}$",
+      "type": "string"
+    },
+    "maxItems": 20,
+    "type": "array"
+  }
+]

Previous value: -"One or more NCT IDs (max 20). E.g., \"NCT12345678\" or [\"NCT12345678\", \"NCT87654321\"]. Use summary=true for large batches to avoid large payloads."New value: +"One or more NCT IDs (max 20) — an empty list is rejected. E.g., \"NCT12345678\" or [\"NCT12345678\", \"NCT87654321\"]. Use summary=true for large batches to avoid large payloads."

Added value: +{
+  "description": "Optional cap on the number of outcome measures returned per study, taken in the order ClinicalTrials.gov publishes them. Omit for no cap (every measure). Applies to full mode only — summary mode is already condensed. Each surviving measure keeps its complete groups/classes/measurements/analyses tree. Upstream total preserved in filtersApplied.totalOutcomes only when the cap trims the list.",
+  "maximum": 100,
+  "minimum": 1,
+  "type": "integer"
+}

Previous value: -"Filter which sections to return. Values: outcomes, adverseEvents, participantFlow, baseline, moreInfo. Omit for all sections."New value: +"Filter which sections to return. Values: outcomes, adverseEvents, participantFlow, baseline, moreInfo. Omit for all sections — an empty list is rejected, not treated as omission."

Previous value: -"Return condensed summaries instead of full data. Reduces payload from ~200KB to ~5KB per study. Summaries include outcome titles, types, timeframes, group counts, and top-level stats — omitting individual measurements, analyses, and per-group data."New value: +"Return condensed summaries instead of full data. Full mode renders every row and field on both output channels, so a large results set can exceed 500KB per study; summary mode reduces that to ~5KB. Summaries include outcome titles, types, timeframes, group counts, and top-level stats — omitting individual measurements, analyses, and per-group data. For a middle ground, keep full mode and cap the two lists that carry the bulk with outcomeLimit / adverseEventLimit."

Added value: +{
+  "additionalProperties": false,
+  "description": "What a cap trimmed on this study — present only when a cap actually reduced a list. Absent means the payload is the complete upstream set for the requested sections.",
+  "properties": {
+    "adverseEventLimit": {
+      "description": "Echo of the adverseEventLimit input — present only when the cap trimmed a list.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    },
+    "outcomeLimit": {
+      "description": "Echo of the outcomeLimit input — present only when the cap trimmed the list.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    },
+    "totalOtherEvents": {
+      "description": "Upstream other adverse event count before adverseEventLimit trimmed the list.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    },
+    "totalOutcomes": {
+      "description": "Upstream outcome measure count before outcomeLimit trimmed the list.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    },
+    "totalSeriousEvents": {
+      "description": "Upstream serious adverse event count before adverseEventLimit trimmed the list.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    }
+  },
+  "type": "object"
+}

Added value: +{
+  "description": "True when a cap trimmed a list on at least one study; absent when nothing was trimmed, matching filtersApplied one level down. Which study and which list is named in that study’s filtersApplied.",
+  "type": "boolean"
+}

Previous value: -"Condition/disease-specific search. E.g., \"Type 2 Diabetes\", \"non-small cell lung cancer\". Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."New value: +"Condition/disease-specific search. E.g., \"Type 2 Diabetes\", \"non-small cell lung cancer\". Matches Condition, BriefTitle, OfficialTitle, ConditionMeshTerm, ConditionAncestorTerm, Keyword, and NCTId. ConditionAncestorTerm is the MeSH umbrella above the conditions a study itself lists, so results run broader than those lists — a study can match a parent term it never names. Plain words plus AND/OR/NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression, which this parameter accepts; a stray bracket fails. `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"PascalCase leaf names to return; strongly recommended since full records are ~70KB. Common leaves: NCTId, BriefTitle, BriefSummary, OverallStatus, Phase, LeadSponsorName, Condition. Call clinicaltrials_get_field_definitions with a concept query (e.g., \"adverse events\", \"eligibility\") to find the exact leaf for any concept."New value: +"PascalCase leaf names to return; strongly recommended since full records are ~70KB. Omit for the compact index projection — an empty list is rejected, not treated as omission. Common leaves: NCTId, BriefTitle, BriefSummary, OverallStatus, Phase, LeadSponsorName, Condition. Call clinicaltrials_get_field_definitions with a concept query (e.g., \"adverse events\", \"eligibility\") to find the exact leaf for any concept."

Previous value: -"Geographic proximity filter. Format: distance(lat,lon,radius). E.g., \"distance(47.6062,-122.3321,50mi)\" for studies within 50 miles of Seattle. When set, each study's locations are re-sorted by proximity to the center so the nearest matched site leads, annotated with its distance in miles; the full location list is preserved."New value: +"Geographic proximity filter. Format: distance(lat,lon,radius), where radius carries a `mi` or `km` suffix — e.g. \"distance(47.6062,-122.3321,50mi)\" for studies within 50 miles of Seattle. Always include the suffix: a bare radius is accepted upstream but interpreted as meters, which silently matches almost nothing. When set, each study's locations are re-sorted by proximity to the center so the nearest matched site leads, annotated with its distance in miles; the full location list is preserved."

Previous value: -"Intervention/treatment search. E.g., \"pembrolizumab\", \"cognitive behavioral therapy\". Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."New value: +"Intervention/treatment search. E.g., \"pembrolizumab\", \"cognitive behavioral therapy\". Matches InterventionName, InterventionType, ArmGroupType, InterventionOtherName, BriefTitle, OfficialTitle, ArmGroupLabel, InterventionMeshTerm, Keyword, InterventionAncestorTerm, InterventionDescription, and ArmGroupDescription. InterventionAncestorTerm is the MeSH umbrella above the interventions a study itself lists, so results run broader than those lists. Plain words plus AND/OR/NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression, which this parameter accepts; a stray bracket fails. `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"Location search — city, state, country, or facility name. Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."New value: +"Location search — city, state, country, or facility name. Matches LocationCity, LocationState, LocationCountry, LocationFacility, and LocationZip; a study matches when any of its sites does. Plain words plus AND/OR/NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression, which this parameter accepts; a stray bracket fails. `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"Filter to specific NCT IDs for batch lookups."New value: +"Filter to specific NCT IDs for batch lookups. Omit to search every study — an empty list is rejected, not treated as \"no filter\". Supplying this lifts the default unknown-enrollment exclusion, so an ID you name is never filtered out of its own lookup."

Previous value: -"Search within outcome measure fields. Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."New value: +"Search within outcome measure fields. Matches PrimaryOutcomeMeasure, SecondaryOutcomeMeasure, OtherOutcomeMeasure, and OutcomeMeasureTitle, plus their description counterparts PrimaryOutcomeDescription, SecondaryOutcomeDescription, OtherOutcomeDescription, OutcomeMeasureDescription, and OutcomeMeasurePopulationDescription — so a term appearing only in outcome prose still matches. Plain words plus AND/OR/NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression, which this parameter accepts; a stray bracket fails. `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"Filter by trial phase. Values: EARLY_PHASE1, PHASE1, PHASE2, PHASE3, PHASE4, NA."New value: +"Filter by trial phase. Omit to search all phases — an empty list is rejected, not treated as \"no filter\". Values: EARLY_PHASE1, PHASE1, PHASE2, PHASE3, PHASE4, NA."

Previous value: -"General free-text search across all fields. Plain words plus AND, OR, NOT. `[ ]` are reserved (advancedFilter AREA[] only); `( )` group sub-expressions and work when matched; `,` acts as AND. For field-scoped searches, use the dedicated *Query parameters (conditionQuery, interventionQuery, etc.) or advancedFilter with AREA[FieldName]value."New value: +"General free-text search across all fields. Runs the 57-field relevance search ClinicalTrials.gov publishes for this parameter — NCTId, NCTIdAlias, OrgStudyId, SecondaryId, Acronym, BriefTitle, OfficialTitle, Condition, InterventionName, InterventionOtherName, Phase, StdAge, StudyType, BriefSummary, outcome measures and their descriptions, LeadSponsorName, CollaboratorName, the Location* fields, the Design* fields, and the ConditionAncestorTerm/InterventionAncestorTerm MeSH umbrellas — so a hit need not carry your term in the field you had in mind. Plain words plus AND, OR, NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression — those work here as well as in advancedFilter, so AREA[Phase]PHASE2 is accepted in this parameter; a stray bracket fails. `( )` group sub-expressions and work when matched; `,` acts as AND. The dedicated *Query parameters (conditionQuery, interventionQuery, etc.) scope a search to one field."

Previous value: -"Sponsor/collaborator name search. Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."New value: +"Sponsor/collaborator name search. Matches LeadSponsorName, CollaboratorName, and OrgFullName. Plain words plus AND/OR/NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression, which this parameter accepts; a stray bracket fails. `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"Filter by study status. Values: RECRUITING, COMPLETED, ACTIVE_NOT_RECRUITING, NOT_YET_RECRUITING, ENROLLING_BY_INVITATION, SUSPENDED, TERMINATED, WITHDRAWN, UNKNOWN, WITHHELD, NO_LONGER_AVAILABLE, AVAILABLE, APPROVED_FOR_MARKETING, TEMPORARILY_NOT_AVAILABLE."New value: +"Filter by study status. Omit to search all statuses — an empty list is rejected, not treated as \"no filter\". Values: RECRUITING, COMPLETED, ACTIVE_NOT_RECRUITING, NOT_YET_RECRUITING, ENROLLING_BY_INVITATION, SUSPENDED, TERMINATED, WITHDRAWN, UNKNOWN, WITHHELD, NO_LONGER_AVAILABLE, AVAILABLE, APPROVED_FOR_MARKETING, TEMPORARILY_NOT_AVAILABLE."

Previous value: -"Search within study titles and acronyms only. Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."New value: +"Search within study titles and acronyms only. Matches Acronym, BriefTitle, and OfficialTitle. Plain words plus AND/OR/NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression, which this parameter accepts; a stray bracket fails. `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"Token for the next page. Absent on last page."New value: +"Token for the next page. Absent when this response already carries every matching study; otherwise it mirrors the upstream cursor, which ClinicalTrials.gov emits whenever a page fills to pageSize — so on a continuation page a token can still lead to an empty page."

Previous value: -"Normalized search criteria applied to this eligibility query."New value: +"Normalized search criteria applied to this eligibility query, including the exact upstream query strings needed to reproduce the full match set via clinicaltrials_search_studies (replay with includeUnknownEnrollment=true, which find_eligible always sets)."

Added value: +{
+  "description": "The exact AREA[] advancedFilter (age range, plus sex/healthy-volunteer when constrained) sent upstream. Pass as advancedFilter to clinicaltrials_search_studies to reproduce the demographic constraints.",
+  "type": "string"
+}

Added value: +{
+  "description": "The exact queryCond string sent upstream (multi-word terms quoted, OR-joined). Pass as conditionQuery to clinicaltrials_search_studies to reproduce the full match set beyond the maxResults cap.",
+  "type": "string"
+}

Previous value: -"Location searched."New value: +"The exact queryLocn string sent upstream (city/state/country joined). Pass as locationQuery to clinicaltrials_search_studies to reproduce the location filter beyond the maxResults cap."

Added value: +{
+  "description": "The status filter applied ([\"RECRUITING\"] when recruitingOnly). Pass as statusFilter to clinicaltrials_search_studies. Absent when recruitingOnly is false.",
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}

Previous value: -"Echo of the explicit fields parameter — present only when the caller passed fields. Lifts the default truncation cap so all requested leaves render in full."New value: +"Echo of the explicit fields parameter — present only when the caller passed fields. Signals that studies carry the requested leaves at full fidelity (not the default compact index) and that the rendered truncation cap is lifted so all of them appear."

Previous value: -"Matching studies. Each entry is a nested ClinicalTrials.gov study record — top-level keys: protocolSection, derivedSection, hasResults, resultsSection, documentSection. Use clinicaltrials_get_field_definitions to explore the schema."New value: +"Matching studies. By default each entry is a COMPACT index projection — nctId, briefTitle, overallStatus, phases, enrollmentCount, leadSponsor, conditions, and a bounded locations summary ({ total, nearest }) — mirroring the rendered result, NOT the full ~70KB record. Pass the fields parameter to receive exactly the requested leaves at full fidelity instead (e.g. all locations). Fetch a full single record with clinicaltrials_get_study_record."

Previous value: -[
-  {
-    "description": "A single PascalCase field name.",
-    "type": "string"
-  },
-  {
-    "description": "Multiple PascalCase field names.",
-    "items": {
-      "type": "string"
-    },
-    "type": "array"
-  }
-]New value: +[
+  {
+    "description": "A single PascalCase field name.",
+    "type": "string"
+  },
+  {
+    "description": "Multiple PascalCase field names (at least one required).",
+    "items": {
+      "type": "string"
+    },
+    "minItems": 1,
+    "type": "array"
+  }
+]

Added value: +{
+  "description": "True when the field is array-typed (a study can carry several values, e.g. Phase, Condition), so the per-value studiesCount buckets sum above the study total. Use to avoid computing a percentage against the corpus.",
+  "type": "boolean"
+}

Previous value: -"Values ranked by frequency (capped at 250 by the API). Present for ENUM/STRING fields."New value: +"Values ranked by frequency (capped at 250 by the API). Present for ENUM/STRING fields. When multiValued is true, studiesCount sums can exceed the study total."

Previous value: -"Echo of active query/filter criteria applied to this count."New value: +"Echo of active query/filter criteria applied to this count, including sentinelFilterActive when the default unknown-enrollment exclusion is in effect."

Previous value: -"Optional cap on the number of locations returned. Omit for no cap (full upstream list). Pairs naturally with nearLocation for narrowing a large multi-site trial. Original total preserved in filtersApplied.totalLocations whenever a cap is applied."New value: +"Optional cap on the number of locations returned. Omit for no cap (full upstream list). Pairs naturally with nearLocation for narrowing a large multi-site trial. Original total preserved in filtersApplied.totalLocations only when the cap trims the list."

Previous value: -"Filter returned locations to those within radius of (lat, lon) and sort by distance. Adds distanceMi to each location. Locations without published coordinates are dropped — most US sites carry them; international sites less reliably so. For broader geographic filtering across studies, use clinicaltrials_search_studies with geoFilter."New value: +"Filter returned locations to those within radius of (lat, lon) and sort by distance. Adds distanceMi to each location. Locations without published coordinates are dropped — most US sites carry them; international sites less reliably so. Distances reflect ClinicalTrials.gov geocoding granularity — typically city-centroid, not facility-level — so multiple sites in the same city resolve to near-identical distances. For broader geographic filtering across studies, use clinicaltrials_search_studies with geoFilter."

Previous value: -"Optional cap on the number of secondary and other outcomes returned. Omit for no cap (full upstream lists). Primary outcomes are never capped. Original totals preserved in filtersApplied.totalSecondaryOutcomes / totalOtherOutcomes whenever a cap is applied."New value: +"Optional cap on the number of secondary and other outcomes returned. Omit for no cap (full upstream lists). Primary outcomes are never capped. Original totals preserved in filtersApplied.totalSecondaryOutcomes / totalOtherOutcomes only when the cap trims a list."

Previous value: -"Optional cap on the number of references returned. Omit for no cap (full upstream list). Original total preserved in filtersApplied.totalReferences whenever a cap is applied. seeAlsoLinks are never capped."New value: +"Optional cap on the number of references returned. Omit for no cap (full upstream list). Original total preserved in filtersApplied.totalReferences only when the cap trims the list. seeAlsoLinks are never capped."

Previous value: -"Echo of the locationLimit input."New value: +"Echo of the locationLimit input — present only when the cap trimmed the list."

Previous value: -"Echo of the outcomeLimit input."New value: +"Echo of the outcomeLimit input — present only when the cap trimmed a list."

Previous value: -"Echo of the referenceLimit input."New value: +"Echo of the referenceLimit input — present only when the cap trimmed the list."

Previous value: -"Geographic proximity filter. Format: distance(lat,lon,radius). E.g., \"distance(47.6062,-122.3321,50mi)\" for studies within 50 miles of Seattle."New value: +"Geographic proximity filter. Format: distance(lat,lon,radius). E.g., \"distance(47.6062,-122.3321,50mi)\" for studies within 50 miles of Seattle. When set, each study's locations are re-sorted by proximity to the center so the nearest matched site leads, annotated with its distance in miles; the full location list is preserved."

Previous value: -"Medical conditions or diagnoses. E.g., [\"Type 2 Diabetes\", \"Hypertension\"]. Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."New value: +"Medical conditions or diagnoses, e.g. [\"Type 2 Diabetes\", \"Hypertension\"]. Each entry is matched as a condition (multi-word entries match as a phrase); multiple entries are combined with OR, so studies for any listed condition qualify. Returned studies are re-ranked so those whose own condition list names a requested condition rank above tangential matches the upstream fuzzy search pulls in via the MeSH umbrella."

Added value: +{
+  "description": "The limit cap applied to this search (search mode only).",
+  "type": "number"
+}

Previous value: -"Recovery guidance when search mode returns no matches — suggests alternative keywords."New value: +"Recovery guidance when search mode returns no matches, or a truncation note when results are capped."

Added value: +{
+  "description": "Number of fields returned (search mode only).",
+  "type": "number"
+}

Added value: +{
+  "description": "True when the field list was capped by the limit parameter (search mode only).",
+  "type": "boolean"
+}

Added value: +{
+  "description": "Optional cap on the number of references returned. Omit for no cap (full upstream list). Original total preserved in filtersApplied.totalReferences whenever a cap is applied. seeAlsoLinks are never capped.",
+  "maximum": 100,
+  "minimum": 1,
+  "type": "integer"
+}

Added value: +{
+  "description": "Echo of the referenceLimit input.",
+  "maximum": 9007199254740991,
+  "minimum": -9007199254740991,
+  "type": "integer"
+}

Added value: +{
+  "description": "Upstream reference count before referenceLimit was applied.",
+  "maximum": 9007199254740991,
+  "minimum": -9007199254740991,
+  "type": "integer"
+}

Previous value: -"Sort order. Format: FieldName:asc or FieldName:desc. E.g., \"LastUpdatePostDate:desc\", \"EnrollmentCount:desc\". Max 2 fields comma-separated. Use clinicaltrials_get_field_definitions to find sortable field names."New value: +"Sort order. Format: FieldName:asc or FieldName:desc. E.g., \"LastUpdatePostDate:desc\", \"EnrollmentCount:desc\". Max 2 fields comma-separated. For \"largest trials\" queries, pair EnrollmentCount:desc with advancedFilter \"AREA[StudyType]INTERVENTIONAL\" — the top enrollment counts are observational registry/claims studies enrolling tens of millions. Enrollment counts are sponsor-reported and not validated upstream beyond the unknown-enrollment sentinel exclusion. Use clinicaltrials_get_field_definitions to find sortable field names."

Previous value: -"Medical conditions or diagnoses. E.g., [\"Type 2 Diabetes\", \"Hypertension\"]. Plain words only — reserved chars `[ ] ( ) ,` inside an entry will fail."New value: +"Medical conditions or diagnoses. E.g., [\"Type 2 Diabetes\", \"Hypertension\"]. Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"Condition/disease-specific search. E.g., \"Type 2 Diabetes\", \"non-small cell lung cancer\". Plain words plus AND/OR/NOT only — reserved chars: [ ] ( ) ,"New value: +"Condition/disease-specific search. E.g., \"Type 2 Diabetes\", \"non-small cell lung cancer\". Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"Intervention/treatment search. E.g., \"pembrolizumab\", \"cognitive behavioral therapy\". Plain words plus AND/OR/NOT only — reserved chars: [ ] ( ) ,"New value: +"Intervention/treatment search. E.g., \"pembrolizumab\", \"cognitive behavioral therapy\". Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"Location search — city, state, country, or facility name. Plain words plus AND/OR/NOT only — reserved chars: [ ] ( ) ,"New value: +"Location search — city, state, country, or facility name. Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"Search within outcome measure fields. Plain words plus AND/OR/NOT only — reserved chars: [ ] ( ) ,"New value: +"Search within outcome measure fields. Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"General free-text search across all fields. Plain words plus AND, OR, NOT only — reserved chars `[ ] ( ) ,` will fail. For field-scoped searches, use the dedicated *Query parameters (conditionQuery, interventionQuery, etc.) or advancedFilter with AREA[FieldName]value."New value: +"General free-text search across all fields. Plain words plus AND, OR, NOT. `[ ]` are reserved (advancedFilter AREA[] only); `( )` group sub-expressions and work when matched; `,` acts as AND. For field-scoped searches, use the dedicated *Query parameters (conditionQuery, interventionQuery, etc.) or advancedFilter with AREA[FieldName]value."

Previous value: -"Sponsor/collaborator name search. Plain words plus AND/OR/NOT only — reserved chars: [ ] ( ) ,"New value: +"Sponsor/collaborator name search. Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"Search within study titles and acronyms only. Plain words plus AND/OR/NOT only — reserved chars: [ ] ( ) ,"New value: +"Search within study titles and acronyms only. Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"Condition/disease-specific search. E.g., \"Type 2 Diabetes\", \"non-small cell lung cancer\". Plain words plus AND/OR/NOT only — reserved chars: [ ] ( ) ,"New value: +"Condition/disease-specific search. E.g., \"Type 2 Diabetes\", \"non-small cell lung cancer\". Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"Intervention/treatment search. E.g., \"pembrolizumab\", \"cognitive behavioral therapy\". Plain words plus AND/OR/NOT only — reserved chars: [ ] ( ) ,"New value: +"Intervention/treatment search. E.g., \"pembrolizumab\", \"cognitive behavioral therapy\". Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"Location search — city, state, country, or facility name. Plain words plus AND/OR/NOT only — reserved chars: [ ] ( ) ,"New value: +"Location search — city, state, country, or facility name. Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"Search within outcome measure fields. Plain words plus AND/OR/NOT only — reserved chars: [ ] ( ) ,"New value: +"Search within outcome measure fields. Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"General free-text search across all fields. Plain words plus AND, OR, NOT only — reserved chars `[ ] ( ) ,` will fail. For field-scoped searches, use the dedicated *Query parameters (conditionQuery, interventionQuery, etc.) or advancedFilter with AREA[FieldName]value."New value: +"General free-text search across all fields. Plain words plus AND, OR, NOT. `[ ]` are reserved (advancedFilter AREA[] only); `( )` group sub-expressions and work when matched; `,` acts as AND. For field-scoped searches, use the dedicated *Query parameters (conditionQuery, interventionQuery, etc.) or advancedFilter with AREA[FieldName]value."

Previous value: -"Sponsor/collaborator name search. Plain words plus AND/OR/NOT only — reserved chars: [ ] ( ) ,"New value: +"Sponsor/collaborator name search. Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."

Previous value: -"Search within study titles and acronyms only. Plain words plus AND/OR/NOT only — reserved chars: [ ] ( ) ,"New value: +"Search within study titles and acronyms only. Plain words plus AND/OR/NOT. `[ ]` are reserved; `( )` group sub-expressions when matched; `,` acts as AND."

Added value: +{
+  "description": "Location search — city, state, country, or facility name. Plain words plus AND/OR/NOT only — reserved chars: [ ] ( ) ,",
+  "type": "string"
+}

Added value: +{
+  "description": "Search within outcome measure fields. Plain words plus AND/OR/NOT only — reserved chars: [ ] ( ) ,",
+  "type": "string"
+}

Added value: +{
+  "description": "Search within study titles and acronyms only. Plain words plus AND/OR/NOT only — reserved chars: [ ] ( ) ,",
+  "type": "string"
+}

Added value: +{
+  "additionalProperties": false,
+  "description": "Compact counts of posted results, present when hasResults is true. The full resultsSection is intentionally omitted from this record-level tool — fetch it via clinicaltrials_get_study_results or the clinicaltrials://{nctId} resource.",
+  "properties": {
+    "baselineMeasures": {
+      "description": "Baseline characteristic measures.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    },
+    "otherAdverseEvents": {
+      "description": "Distinct other (non-serious) adverse-event terms.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    },
+    "outcomeMeasures": {
+      "description": "Posted outcome measures.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    },
+    "participantFlowPeriods": {
+      "description": "Participant-flow periods.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    },
+    "seriousAdverseEvents": {
+      "description": "Distinct serious adverse-event terms.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    }
+  },
+  "type": "object"
+}

Previous value: -"Full study record with caller-requested filters already applied to locations and outcomes. Top-level keys: protocolSection (identification, status, sponsor, conditions, design, arms/interventions, outcomes, eligibility, contacts/locations), derivedSection (MeSH-normalized terms), hasResults, resultsSection, documentSection. Use clinicaltrials_get_field_definitions to explore the schema."New value: +"Full study record with caller-requested filters already applied to locations and outcomes. Top-level keys: protocolSection (identification, status, sponsor, conditions, design, arms/interventions, outcomes, eligibility, contacts/locations), derivedSection (MeSH-normalized terms), hasResults, documentSection. The heavy resultsSection is omitted — see resultsSummary for counts and clinicaltrials_get_study_results for full results data. Use clinicaltrials_get_field_definitions to explore the schema."

Previous value: -[
-  {
-    "description": "A single section name.",
-    "enum": [
-      "outcomes",
-      "adverseEvents",
-      "participantFlow",
-      "baseline"
-    ],
-    "type": "string"
-  },
-  {
-    "description": "Multiple section names.",
-    "items": {
-      "enum": [
-        "outcomes",
-        "adverseEvents",
-        "participantFlow",
-        "baseline"
-      ],
-      "type": "string"
-    },
-    "type": "array"
-  }
-]New value: +[
+  {
+    "description": "A single section name.",
+    "enum": [
+      "outcomes",
+      "adverseEvents",
+      "participantFlow",
+      "baseline",
+      "moreInfo"
+    ],
+    "type": "string"
+  },
+  {
+    "description": "Multiple section names.",
+    "items": {
+      "enum": [
+        "outcomes",
+        "adverseEvents",
+        "participantFlow",
+        "baseline",
+        "moreInfo"
+      ],
+      "type": "string"
+    },
+    "type": "array"
+  }
+]

Previous value: -"Filter which sections to return. Values: outcomes, adverseEvents, participantFlow, baseline. Omit for all sections."New value: +"Filter which sections to return. Values: outcomes, adverseEvents, participantFlow, baseline, moreInfo. Omit for all sections."

Previous value: -"Adverse events. Summary mode: timeFrame, groupCount, seriousEventCount, otherEventCount. Full mode: adds eventGroups, seriousEvents, otherEvents with per-event term and per-group affected/at-risk stats."New value: +"Adverse events. Summary mode: timeFrame, groupCount, seriousEventCount, otherEventCount, plus topEvents — the most frequent events ranked by participants affected, aggregated across arms (term, organSystem, kind, numAffected, numAtRisk). Full mode: adds eventGroups, seriousEvents, otherEvents with per-event term and per-group affected/at-risk stats."

Added value: +{
+  "additionalProperties": {},
+  "description": "Results metadata from moreInfoModule. Summary mode: limitationsAndCaveats, certainAgreement flags (piSponsorEmployee, restrictiveAgreement, restrictionType), and pointOfContact. Full mode: adds certainAgreement.otherDetails.",
+  "propertyNames": {
+    "type": "string"
+  },
+  "type": "object"
+}

Previous value: -"Echo of active query/filter criteria. Present when results are empty."New value: +"Echo of active query/filter criteria applied to this search, including sentinelFilterActive when the default unknown-enrollment exclusion is in effect. Present on every response."

Previous value: -"Match counts at each filter stage. Diagnoses where the funnel collapsed on sparse results — e.g., conditionMatched=298 but demographicsMatched=2 means age/sex/status are the constraint."New value: +"Match counts at each filter stage. Shows where the funnel collapsed — e.g., conditionMatched=298 but demographicsMatched=2 means age/sex/status are the constraint."

Removed value: -{
-  "description": "Hints when no studies match, with suggestions to broaden the search.",
-  "items": {
-    "type": "string"
-  },
-  "type": "array"
-}

Added value: +{
+  "description": "Recovery guidance when no studies matched — identifies which filter stage collapsed and suggests how to broaden. Absent when results are returned.",
+  "type": "string"
+}

Previous value: -"Search criteria used."New value: +"Normalized search criteria applied to this eligibility query."

Added value: +{
+  "description": "Recovery guidance when search mode returns no matches — suggests alternative keywords.",
+  "type": "string"
+}

Previous value: -"Echo of the keyword when mode is \"search\"."New value: +"Echo of the keyword used in search mode. Absent for drill and overview."

Removed value: -{
-  "description": "Suggestions when no studies match (totalCount is 0).",
-  "items": {
-    "type": "string"
-  },
-  "type": "array"
-}

Added value: +{
+  "description": "Recovery guidance when totalCount is 0 — suggests how to broaden the query or filters.",
+  "type": "string"
+}

Previous value: -"Echo of query/filter criteria used."New value: +"Echo of active query/filter criteria applied to this count."

Removed value: -{
-  "description": "Suggestions for broadening the search when no results are found.",
-  "items": {
-    "type": "string"
-  },
-  "type": "array"
-}

Added value: +{
+  "description": "Recovery guidance when no studies matched — echoes the constraint and suggests how to broaden. Absent on pages with results.",
+  "type": "string"
+}

Previous value: -"Echo of query/filter criteria used. Present when results are empty."New value: +"Echo of active query/filter criteria. Present when results are empty."

Removed value: -false

Added value: +{
+  "description": "Advanced filter using AREA[] Essie syntax. E.g., \"AREA[StudyType]INTERVENTIONAL\", \"AREA[EnrollmentCount]RANGE[100, 1000]\". Combine with AND/OR/NOT and parentheses.",
+  "type": "string"
+}

Added value: +{
+  "description": "Condition/disease-specific search. E.g., \"Type 2 Diabetes\", \"non-small cell lung cancer\".",
+  "type": "string"
+}

Added value: +{
+  "default": true,
+  "description": "Include total study count in response. Only computed on the first page.",
+  "type": "boolean"
+}

Previous value: -"A list of specific top-level fields to include in the response."New value: +"Fields to return (PascalCase piece names). Strongly recommended to reduce payload. Common: NCTId, BriefTitle, OverallStatus, Phase, LeadSponsorName, Condition, InterventionName, BriefSummary, EnrollmentCount, StartDate."

Removed value: -{
-  "additionalProperties": false,
-  "description": "A set of filters that narrow the search results without affecting ranking.",
-  "properties": {
-    "advanced": {
-      "description": "Apply an advanced filter using Essie expression syntax.",
-      "type": "string"
-    },
-    "geo": {
-      "additionalProperties": false,
-      "description": "Filter results to a geographic area by providing a point and radius.",
-      "properties": {
-        "latitude": {
-          "maximum": 90,
-          "minimum": -90,
-          "type": "number"
-        },
-        "longitude": {
-          "maximum": 180,
-          "minimum": -180,
-          "type": "number"
-        },
-        "radius": {
-          "exclusiveMinimum": 0,
-          "type": "number"
-        },
-        "unit": {
-          "default": "km",
-          "enum": [
-            "km",
-            "mi"
-          ],
-          "type": "string"
-        }
-      },
-      "required": [
-        "latitude",
-        "longitude",
-        "radius"
-      ],
-      "type": "object"
-    },
-    "ids": {
-      "description": "Return only studies with the specified NCT IDs.",
-      "items": {
-        "type": "string"
-      },
-      "type": "array"
-    },
-    "overallStatus": {
-      "description": "Filter results by one or more study statuses.",
-      "items": {
-        "enum": [
-          "ACTIVE_NOT_RECRUITING",
-          "COMPLETED",
-          "ENROLLING_BY_INVITATION",
-          "NOT_YET_RECRUITING",
-          "RECRUITING",
-          "SUSPENDED",
-          "TERMINATED",
-          "WITHDRAWN",
-          "UNKNOWN"
-        ],
-        "type": "string"
-      },
-      "type": "array"
-    }
-  },
-  "type": "object"
-}

Added value: +{
+  "description": "Geographic proximity filter. Format: distance(lat,lon,radius). E.g., \"distance(47.6062,-122.3321,50mi)\" for studies within 50 miles of Seattle.",
+  "type": "string"
+}

Added value: +{
+  "description": "Intervention/treatment search. E.g., \"pembrolizumab\", \"cognitive behavioral therapy\".",
+  "type": "string"
+}

Added value: +{
+  "description": "Location search — city, state, country, or facility name.",
+  "type": "string"
+}

Added value: +{
+  "anyOf": [
+    {
+      "pattern": "^NCT\\d{8}$",
+      "type": "string"
+    },
+    {
+      "items": {
+        "pattern": "^NCT\\d{8}$",
+        "type": "string"
+      },
+      "type": "array"
+    }
+  ],
+  "description": "Filter to specific NCT IDs for batch lookups."
+}

Added value: +{
+  "description": "Search within outcome measure fields.",
+  "type": "string"
+}

Previous value: -"The number of studies to return per page (1-200). Defaults to 10."New value: +"Results per page, 1–200."

Previous value: -"A token used to retrieve the next page of results."New value: +"Pagination cursor from a previous response."

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    }
+  ],
+  "description": "Filter by trial phase. Values: EARLY_PHASE1, PHASE1, PHASE2, PHASE3, PHASE4, NA."
+}

Removed value: -false

Previous value: -"A set of search terms that influence result ranking."New value: +"General full-text search across all fields."

Removed value: -{
-  "cond": {
-    "description": "Search for conditions or diseases.",
-    "type": "string"
-  },
-  "id": {
-    "description": "Search for study identifiers (e.g., NCT ID).",
-    "type": "string"
-  },
-  "intr": {
-    "description": "Search for specific interventions or treatments.",
-    "type": "string"
-  },
-  "locn": {
-    "description": "Search for study locations.",
-    "type": "string"
-  },
-  "outc": {
-    "description": "Search for specific outcome measures.",
-    "type": "string"
-  },
-  "spons": {
-    "description": "Search for sponsors or collaborators.",
-    "type": "string"
-  },
-  "term": {
-    "description": "Search for other terms like interventions, outcomes, or sponsors.",
-    "type": "string"
-  },
-  "titles": {
-    "description": "Search within study titles or acronyms.",
-    "type": "string"
-  }
-}

Previous value: -"object"New value: +"string"

Previous value: -"Specify the sort order for the results."New value: +"Sort order. Format: FieldName:asc or FieldName:desc. E.g., \"LastUpdatePostDate:desc\", \"EnrollmentCount:desc\". Max 2 fields comma-separated."

Removed value: -{
-  "type": "string"
-}

Previous value: -"array"New value: +"string"

Added value: +{
+  "description": "Sponsor/collaborator name search.",
+  "type": "string"
+}

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    }
+  ],
+  "description": "Filter by study status. Values: RECRUITING, COMPLETED, ACTIVE_NOT_RECRUITING, NOT_YET_RECRUITING, ENROLLING_BY_INVITATION, SUSPENDED, TERMINATED, WITHDRAWN, UNKNOWN, WITHHELD, NO_LONGER_AVAILABLE, AVAILABLE, APPROVED_FOR_MARKETING, TEMPORARILY_NOT_AVAILABLE."
+}

Added value: +{
+  "description": "Search within study titles and acronyms only.",
+  "type": "string"
+}

Added value: +"Token for the next page. Absent on last page."

Added value: +{
+  "description": "Suggestions for broadening the search when no results are found.",
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}

Added value: +{
+  "additionalProperties": {},
+  "description": "Echo of query/filter criteria used. Present when results are empty.",
+  "propertyNames": {
+    "type": "string"
+  },
+  "type": "object"
+}

Added value: +"Matching studies."

Previous value: -trueNew value: +{}

Removed value: -{
-  "derivedSection": {
-    "additionalProperties": true,
-    "properties": {
-      "conditionBrowseModule": {
-        "additionalProperties": true,
-        "properties": {
-          "ancestors": {
-            "items": {
-              "additionalProperties": true,
-              "properties": {
-                "id": {
-                  "type": "string"
-                },
-                "term": {
-                  "type": "string"
-                }
-              },
-              "type": "object"
-            },
-            "type": "array"
-          },
-          "browseBranches": {
-            "items": {
-              "additionalProperties": true,
-              "properties": {
-                "abbrev": {
-                  "type": "string"
-                },
-                "name": {
-                  "type": "string"
-                }
-              },
-              "type": "object"
-            },
-            "type": "array"
-          },
-          "browseLeaves": {
-            "items": {
-              "additionalProperties": true,
-              "properties": {
-                "asFound": {
-                  "type": "string"
-                },
-                "id": {
-                  "type": "string"
-                },
-                "name": {
-                  "type": "string"
-                },
-                "relevance": {
-                  "type": "string"
-                }
-              },
-              "type": "object"
-            },
-            "type": "array"
-          },
-          "meshes": {
-            "items": {
-              "additionalProperties": true,
-              "properties": {
-                "id": {
-                  "type": "string"
-                },
-                "term": {
-                  "type": "string"
-                }
-              },
-              "type": "object"
-            },
-            "type": "array"
-          }
-        },
-        "type": "object"
-      },
-      "interventionBrowseModule": {
-        "additionalProperties": true,
-        "properties": {
-          "ancestors": {
-            "items": {
-              "additionalProperties": true,
-              "properties": {
-                "id": {
-                  "type": "string"
-                },
-                "term": {
-                  "type": "string"
-                }
-              },
-              "type": "object"
-            },
-            "type": "array"
-          },
-          "browseBranches": {
-            "items": {
-              "additionalProperties": true,
-              "properties": {
-                "abbrev": {
-                  "type": "string"
-                },
-                "name": {
-                  "type": "string"
-                }
-              },
-              "type": "object"
-            },
-            "type": "array"
-          },
-          "browseLeaves": {
-            "items": {
-              "additionalProperties": true,
-              "properties": {
-                "id": {
-                  "type": "string"
-                },
-                "name": {
-                  "type": "string"
-                },
-                "relevance": {
-                  "type": "string"
-                }
-              },
-              "type": "object"
-            },
-            "type": "array"
-          },
-          "meshes": {
-            "items": {
-              "additionalProperties": true,
-              "properties": {
-                "id": {
-                  "type": "string"
-                },
-                "term": {
-                  "type": "string"
-                }
-              },
-              "type": "object"
-            },
-            "type": "array"
-          }
-        },
-        "type": "object"
-      },
-      "miscInfoModule": {
-        "additionalProperties": true,
-        "properties": {
-          "versionHolder": {
-            "type": "string"
-          }
-        },
-        "type": "object"
-      }
-    },
-    "type": "object"
-  },
-  "hasResults": {
-    "type": "boolean"
-  },
-  "protocolSection": {
-    "additionalProperties": true,
-    "properties": {
-      "armsInterventionsModule": {
-        "additionalProperties": true,
-        "properties": {
-          "arms": {
-            "items": {
-              "additionalProperties": true,
-              "properties": {
-                "description": {
-                  "type": "string"
-                },
-                "name": {
-                  "type": "string"
-                },
-                "type": {
-                  "type": "string"
-                }
-              },
-              "type": "object"
-            },
-            "type": "array"
-          },
-          "interventions": {
-            "items": {
-              "additionalProperties": true,
-              "properties": {
-                "armNames": {
-                  "items": {
-                    "type": "string"
-                  },
-                  "type": "array"
-                },
-                "description": {
-                  "type": "string"
-                },
-                "name": {
-                  "type": "string"
-                },
-                "type": {
-                  "type": "string"
-                }
-              },
-              "type": "object"
-            },
-            "type": "array"
-          }
-        },
-        "type": "object"
-      },
-      "conditionsModule": {
-        "additionalProperties": true,
-        "properties": {
-          "conditions": {
-            "items": {
-              "type": "string"
-            },
-            "type": "array"
-          },
-          "keywords": {
-            "items": {
-              "type": "string"
-            },
-            "type": "array"
-          }
-        },
-        "type": "object"
-      },
-      "contactsLocationsModule": {
-        "additionalProperties": true,
-        "properties": {
-          "locations": {
-            "items": {
-              "additionalProperties": true,
-              "properties": {
-                "city": {
-                  "type": "string"
-                },
-                "country": {
-                  "type": "string"
-                },
-                "state": {
-                  "type": "string"
-                }
-              },
-              "type": "object"
-            },
-            "type": "array"
-          }
-        },
-        "type": "object"
-      },
-      "descriptionModule": {
-        "additionalProperties": true,
-        "properties": {
-          "briefSummary": {
-            "type": "string"
-          },
-          "detailedDescription": {
-            "type": "string"
-          }
-        },
-        "type": "object"
-      },
-      "designModule": {
-        "additionalProperties": true,
-        "properties": {
-          "designInfo": {
-            "additionalProperties": true,
-            "properties": {
-              "allocation": {
-                "type": "string"
-              },
-              "interventionModel": {
-                "type": "string"
-              },
-              "maskingInfo": {
-                "additionalProperties": true,
-                "properties": {
-                  "masking": {
-                    "type": "string"
-                  }
-                },
-                "type": "object"
-              },
-              "primaryPurpose": {
-                "type": "string"
-              }
-            },
-            "type": "object"
-          },
-          "phases": {
-            "items": {
-              "type": "string"
-            },
-            "type": "array"
-          },
-          "studyType": {
-            "type": "string"
-          }
-        },
-        "type": "object"
-      },
-      "eligibilityModule": {
-        "additionalProperties": true,
-        "properties": {
-          "eligibilityCriteria": {
-            "type": "string"
-          },
-          "healthyVolunteers": {
-            "type": "boolean"
-          },
-          "minimumAge": {
-            "type": "string"
-          },
-          "sex": {
-            "type": "string"
-          },
-          "stdAges": {
-            "items": {
-              "type": "string"
-            },
-            "type": "array"
-          }
-        },
-        "type": "object"
-      },
-      "identificationModule": {
-        "additionalProperties": true,
-        "properties": {
-          "acronym": {
-            "type": "string"
-          },
-          "briefTitle": {
-            "type": "string"
-          },
-          "nctId": {
-            "type": "string"
-          },
-          "officialTitle": {
-            "type": "string"
-          },
-          "orgStudyIdInfo": {
-            "additionalProperties": true,
-            "properties": {
-              "id": {
-                "type": "string"
-              }
-            },
-            "type": "object"
-          },
-          "organization": {
-            "additionalProperties": true,
-            "properties": {
-              "class": {
-                "type": "string"
-              },
-              "fullName": {
-                "type": "string"
-              }
-            },
-            "type": "object"
-          }
-        },
-        "required": [
-          "nctId"
-        ],
-        "type": "object"
-      },
-      "sponsorCollaboratorsModule": {
-        "additionalProperties": true,
-        "properties": {
-          "collaborators": {
-            "items": {
-              "additionalProperties": true,
-              "properties": {
-                "class": {
-                  "type": "string"
-                },
-                "name": {
-                  "type": "string"
-                }
-              },
-              "type": "object"
-            },
-            "type": "array"
-          },
-          "leadSponsor": {
-            "additionalProperties": true,
-            "properties": {
-              "class": {
-                "type": "string"
-              },
-              "name": {
-                "type": "string"
-              }
-            },
-            "type": "object"
-          },
-          "responsibleParty": {
-            "additionalProperties": true,
-            "properties": {
-              "type": {
-                "type": "string"
-              }
-            },
-            "type": "object"
-          }
-        },
-        "type": "object"
-      },
-      "statusModule": {
-        "additionalProperties": true,
-        "properties": {
-          "completionDateStruct": {
-            "additionalProperties": true,
-            "properties": {
-              "date": {
-                "type": "string"
-              },
-              "type": {
-                "type": "string"
-              }
-            },
-            "type": "object"
-          },
-          "lastKnownStatus": {
-            "type": "string"
-          },
-          "overallStatus": {
-            "type": "string"
-          },
-          "primaryCompletionDateStruct": {
-            "additionalProperties": true,
-            "properties": {
-              "date": {
-                "type": "string"
-              },
-              "type": {
-                "type": "string"
-              }
-            },
-            "type": "object"
-          },
-          "startDateStruct": {
-            "additionalProperties": true,
-            "properties": {
-              "date": {
-                "type": "string"
-              },
-              "type": {
-                "type": "string"
-              }
-            },
-            "type": "object"
-          }
-        },
-        "type": "object"
-      }
-    },
-    "type": "object"
-  }
-}

Added value: +{
+  "type": "string"
+}

Added value: +"Total matching studies (first page only when countTotal=true)."