cdc-health-mcp-server

Previous value: -"Restrict to deaths in any of the listed age groups — e.g. [\"25-34\",\"35-44\"] covers both. \"1\" is the under-1-year group. \"NS\" is the group CDC puts a death in when the age was not recorded; it is not covered by any of the ten-year groups, so a filter listing all eleven of those still leaves those deaths out and returns fewer deaths than the same query unfiltered. List \"NS\" alongside them to match an unfiltered total, or on its own to count them. Omit for all ages, which includes them."New value: +"Restrict to deaths in any of the listed age groups — e.g. [\"25-34\",\"35-44\"] covers both; a repeated group counts once. \"1\" is the under-1-year group. \"NS\" is the group CDC puts a death in when the age was not recorded; it is not covered by any of the ten-year groups, so a filter listing all eleven of those still leaves those deaths out and returns fewer deaths than the same query unfiltered. List \"NS\" alongside them to match an unfiltered total, or on its own to count them. Omit for all ages, which includes them."

Previous value: -[
-  {
-    "const": "",
-    "type": "string"
-  },
-  {
-    "const": "999--999",
-    "type": "string"
-  },
-  {
-    "description": "ICD-10 underlying-cause code or chapter range. Ranges must match WONDER chapter boundaries exactly (an invalid code is rejected and named in the error) — valid examples: \"A00-B99\" (infectious), \"C00-C97\" (malignant neoplasms), \"I00-I99\" (circulatory), \"J00-J98\" (respiratory), \"V01-Y89\" (external causes), or a single code like \"I21\".",
-    "pattern": "^[A-Z][0-9]{2}(\\.[0-9]+)?(-[A-Z][0-9]{2}(\\.[0-9]+)?)?$",
-    "type": "string"
-  }
-]New value: +[
+  {
+    "const": "",
+    "type": "string"
+  },
+  {
+    "const": "999--999",
+    "type": "string"
+  },
+  {
+    "description": "ICD-10 underlying-cause code or range. WONDER takes a node of its ICD-10 tree — a chapter such as \"A00-B99\" (infectious) or \"V01-Y89\" (external causes), a block such as \"X40-X49\" (accidental poisoning) or \"C00-C97\" (malignant neoplasms), or a single code such as \"I21\" — and rejects any other span, e.g. \"X40-X44\", naming it in the error. List the codes (or blocks) to cover a span that is not a tree node.",
+    "pattern": "^[A-Z][0-9]{2}(\\.[0-9]+)?(-[A-Z][0-9]{2}(\\.[0-9]+)?)?$",
+    "type": "string"
+  },
+  {
+    "description": "A list of 1–50 entries, each in the single-value form, matched as a union: a death counts once when it matches any of them, so a code set such as X40–X44 plus X60–X64 is one series with one set of rates. Repeated entries are ignored.",
+    "items": {
+      "anyOf": [
+        {
+          "const": "999--999",
+          "type": "string"
+        },
+        {
+          "description": "ICD-10 underlying-cause code or range. WONDER takes a node of its ICD-10 tree — a chapter such as \"A00-B99\" (infectious) or \"V01-Y89\" (external causes), a block such as \"X40-X49\" (accidental poisoning) or \"C00-C97\" (malignant neoplasms), or a single code such as \"I21\" — and rejects any other span, e.g. \"X40-X44\", naming it in the error. List the codes (or blocks) to cover a span that is not a tree node.",
+          "pattern": "^[A-Z][0-9]{2}(\\.[0-9]+)?(-[A-Z][0-9]{2}(\\.[0-9]+)?)?$",
+          "type": "string"
+        }
+      ],
+      "description": "One list entry: an ICD-10 code or range, or the withheld-cause marker."
+    },
+    "maxItems": 50,
+    "minItems": 1,
+    "type": "array"
+  }
+]

Previous value: -"Filter to a specific ICD-10 underlying cause of death — the single condition CDC certified as having started the chain of events leading to death. Omit for all causes. Accepted by every database. \"999--999\" is not an ICD-10 code but CDC's own marker for deaths whose cause it is still withholding under the provisional database's six-month reporting lag; it counts that backlog, and only the \"provisional\" database offers it."New value: +"Filter to ICD-10 underlying causes of death — the single condition CDC certified as having started the chain of events leading to death. Takes one code or range, or a list of them for a cause defined as a code set, e.g. drug overdose as [\"X40\",\"X41\",\"X42\",\"X43\",\"X44\",\"X60\",\"X61\",\"X62\",\"X63\",\"X64\",\"X85\",\"Y10\",\"Y11\",\"Y12\",\"Y13\",\"Y14\"]. Omit for all causes. Accepted by every database. \"999--999\" is not an ICD-10 code but CDC's own marker for deaths whose cause it is still withholding under the provisional database's six-month reporting lag; it counts that backlog, and only the \"provisional\" database offers it."

Previous value: -"Dimensions to break results out by (1–4), in output-column order — e.g. [\"year\"], [\"year\",\"sex\"], [\"age_group\",\"race\"]. Results are always national. Cause of death is a filter (cause_icd10), not a grouping. \"race\" resolves to whichever race vocabulary the selected database uses — four bridged groups (Asian and Pacific Islander combined) on the 1999–2020 databases, six single-race groups plus a multiracial category on the others — so a race series from one family cannot be spliced onto one from the other."New value: +"Dimensions to break results out by (1–4, each at most once), in output-column order — e.g. [\"year\"], [\"year\",\"sex\"], [\"age_group\",\"race\"]. Results are always national. Cause of death is a filter (cause_icd10), not a grouping. \"race\" resolves to whichever race vocabulary the selected database uses — four bridged groups (Asian and Pacific Islander combined) on the 1999–2020 databases, six single-race categories on the others, one of them \"More than one race\" — so a race series from one family cannot be spliced onto one from the other."

Previous value: -"Rows to return from the table CDC sent (1–5000). Omit to return the whole table. WONDER's request carries no limit of its own, so this pages a table already fetched in full rather than narrowing the query: the deaths, rates, caveats and hidden-row notices are the same whichever page is read. A four-dimension grouping can run past a thousand rows, so set this and follow nextOffset to walk them."New value: +"Rows to return from the table CDC sent (1–5000). Omit to take as many as fit. Either way fewer come back when the page would carry the response past its 200,000-character budget, counted over the whole result — the rows, their cell notes, and the caveats and messages, as JSON and as the rendered table together; the response says so and gives a nextOffset to resume from. WONDER's request carries no limit of its own, so this pages a table already fetched in full rather than narrowing the query: the deaths, rates, caveats and hidden-row notices are the same whichever page is read."

Previous value: -[
-  {
-    "const": "",
-    "type": "string"
-  },
-  {
-    "const": "999--999",
-    "type": "string"
-  },
-  {
-    "description": "ICD-10 code or chapter range, same form as cause_icd10 — e.g. \"J00-J98\" (respiratory), \"E00-E89\" (endocrine/metabolic), \"S00-T98\" (injury and poisoning, a chapter the underlying-cause finder does not list), or a single code like \"I21\".",
-    "pattern": "^[A-Z][0-9]{2}(\\.[0-9]+)?(-[A-Z][0-9]{2}(\\.[0-9]+)?)?$",
-    "type": "string"
-  }
-]New value: +[
+  {
+    "const": "",
+    "type": "string"
+  },
+  {
+    "const": "999--999",
+    "type": "string"
+  },
+  {
+    "description": "ICD-10 code or range, same form as cause_icd10 — a chapter such as \"S00-T98\" (injury and poisoning, a chapter the underlying-cause finder does not list), a block such as \"J09-J18\" (influenza and pneumonia), or a single code such as \"T40.1\" (heroin).",
+    "pattern": "^[A-Z][0-9]{2}(\\.[0-9]+)?(-[A-Z][0-9]{2}(\\.[0-9]+)?)?$",
+    "type": "string"
+  },
+  {
+    "description": "A list of 1–50 entries, each in the single-value form, matched as a union: a death counts once when it matches any of them, so a code set such as X40–X44 plus X60–X64 is one series with one set of rates. Repeated entries are ignored.",
+    "items": {
+      "anyOf": [
+        {
+          "const": "999--999",
+          "type": "string"
+        },
+        {
+          "description": "ICD-10 code or range, same form as cause_icd10 — a chapter such as \"S00-T98\" (injury and poisoning, a chapter the underlying-cause finder does not list), a block such as \"J09-J18\" (influenza and pneumonia), or a single code such as \"T40.1\" (heroin).",
+          "pattern": "^[A-Z][0-9]{2}(\\.[0-9]+)?(-[A-Z][0-9]{2}(\\.[0-9]+)?)?$",
+          "type": "string"
+        }
+      ],
+      "description": "One list entry: an ICD-10 code or range, or the withheld-cause marker."
+    },
+    "maxItems": 50,
+    "minItems": 1,
+    "type": "array"
+  }
+]

Previous value: -"Filter to deaths with this ICD-10 code recorded anywhere on the death certificate, whether or not it was the underlying cause — e.g. \"died with a respiratory condition listed\", a population no underlying-cause query can produce. Valid only when database is \"multiple_1999_2020\", \"multiple_2018_2024\", or \"provisional\"; the other databases record only the underlying cause and reject it. \"999--999\", the withheld-cause marker described under cause_icd10, is offered here too but only by \"provisional\". Combines with cause_icd10, which keeps meaning the underlying cause. Omit for all causes."New value: +"Filter to deaths with any of these ICD-10 codes recorded anywhere on the death certificate, whether or not it was the underlying cause — e.g. \"died with a respiratory condition listed\", a population no underlying-cause query can produce. Takes one code or range, or a list of them, e.g. opioid involvement as [\"T40.0\",\"T40.1\",\"T40.2\",\"T40.3\",\"T40.4\",\"T40.6\"]. Valid only when database is \"multiple_1999_2020\", \"multiple_2018_2024\", or \"provisional\"; the other databases record only the underlying cause and reject it. \"999--999\", the withheld-cause marker described under cause_icd10, is offered here too but only by \"provisional\". Combines with cause_icd10, which keeps meaning the underlying cause: a death must match both filters. Omit for all causes."

Previous value: -"Inclusive year range. These bounds span every database (1999–2026); the years the selected one actually holds are narrower, and a range outside them is rejected with that database's span named. Omit for all years the database holds."New value: +"Inclusive year range; from must not be later than to. These bounds span every database (1999–2026); the years the selected one actually holds are narrower, and a range outside them is rejected with that database's span named. Omit for all years the database holds."

Previous value: -"The requested limit that bounded this response."New value: +"Rows this call asked for — limit when set, otherwise every row from offset to the end of the table. A shown below it means the response budget cut the page short."

Previous value: -"CDC-provided caveats and footnotes: data revisions, population-estimate sources, suppression and rate-reliability rules. They describe the whole table CDC assembled, so they come back complete on every page rather than scoped to the rows returned."New value: +"CDC-provided caveats and footnotes: data revisions, population-estimate sources, suppression and rate-reliability rules. CDC's links to its methodology pages are kept as Markdown links, e.g. \"[More information.](https://wonder.cdc.gov/wonder/help/ucd-expanded.html#Confidence-Intervals)\". They describe the whole table CDC assembled, so they come back complete on every page rather than scoped to the rows returned."

Previous value: -"Zero-based index into rows — the rows in this response, so it is relative to the page when limit or offset is set."New value: +"Zero-based index into rows — the rows in this response, so it is relative to the page rather than to the whole table."

Previous value: -"Machine-readable failure mode. Declared by this tool: `invalid_query`: The request does not fit the selected database — a year_range outside the years it holds, mcd_icd10 against a database that records only the underlying cause, or the withheld-cause marker against one that keeps no withheld backlog — or WONDER itself rejected it, e.g. an unknown ICD-10 code or a filter/grouping combination it does not allow. `rate_limited`: A request reached WONDER less than 15 seconds after the previous response finished, and WONDER returned 429. `upstream_error`: WONDER returned an unexpected response or was unreachable. Other values are possible when a failure originates below the handler."New value: +"Machine-readable failure mode. Declared by this tool: `invalid_query`: The request contradicts itself — a year_range whose from is later than its to, or a group_by dimension listed twice — or does not fit the selected database — a year_range outside the years it holds, mcd_icd10 against a database that records only the underlying cause, or the withheld-cause marker against one that keeps no withheld backlog — or WONDER itself rejected it, e.g. an ICD-10 code or range its tree does not hold, or a filter/grouping combination it does not allow. `rate_limited`: A request reached WONDER less than 15 seconds after the previous response to the same source IP finished, and WONDER returned 429. This server queues its own calls, so the earlier request usually came from another client sharing that IP. `upstream_error`: WONDER returned an unexpected response or was unreachable. Other values are possible when a failure originates below the handler."

Previous value: -"Notices CDC attached to this table, verbatim. The ones that matter say rows were withheld before the table was sent — \"Rows with zero Deaths are hidden.\" and \"Rows with suppressed Deaths are hidden.\" A withheld row is absent from rows entirely, with nothing in the table marking the gap, so while this array is non-empty a stratum missing from rows may have been dropped rather than unobserved, and any count, ranking, or completeness claim drawn from rows is partial. These describe the whole table, so they come back complete on every page. Empty when CDC withheld no rows."New value: +"Notices CDC attached to this table, verbatim apart from links, which are kept as Markdown links. The ones that matter say rows were withheld before the table was sent — \"Rows with zero Deaths are hidden.\" and \"Rows with suppressed Deaths are hidden.\" A withheld row is absent from rows entirely, with nothing in the table marking the gap, so while this array is non-empty a stratum missing from rows may have been dropped rather than unobserved, and any count, ranking, or completeness claim drawn from rows is partial. These describe the whole table, so they come back complete on every page. Empty when CDC withheld no rows."

Previous value: -"Guidance when no rows matched, when the returned rows are a page of a larger table or the offset ran past it, and a note when CDC returned a status token in place of a measure value."New value: +"Guidance when no rows matched, when the returned rows are a page of a larger table — naming whether limit or the response budget ended it — or the offset ran past it, and a note when CDC returned a status token in place of a measure value."

Previous value: -"Number of rows returned in this response — the page size when limit or offset is set."New value: +"Number of rows returned in this response — the page size whenever it falls short of totalCount."

Previous value: -"Result rows. Each carries the requested group-by dimensions plus deaths, population, crude_rate, and age_adjusted_rate (per 100,000) when age standardization is possible — it is omitted when age_group is a grouping dimension or age_groups selects a single group. Dimension values are CDC's own labels with only surrounding whitespace removed, so the same year keys identically across databases; nothing inside a label is changed, and on the provisional database a year reads \"2025 (provisional)\" or \"2026 (provisional and partial)\" rather than a bare year. A measure cell CDC returned as a status token instead of a number is null here; cellNotes names the cell and the token. When limit or offset is set these are one page of the table CDC sent, in its order; totalCount says how many rows the whole table holds."New value: +"Result rows. Each carries the requested group-by dimensions plus deaths, population, crude_rate, and age_adjusted_rate (per 100,000) when age standardization is possible — it is omitted when age_group is a grouping dimension or age_groups selects a single group. Dimension values are CDC's own labels with only surrounding whitespace removed, so the same year keys identically across databases; nothing inside a label is changed, and on the provisional database a year reads \"2025 (provisional)\" or \"2026 (provisional and partial)\" rather than a bare year. A measure cell CDC returned as a status token instead of a number is null here; cellNotes names the cell and the token. These are one page of the table CDC sent, in its order, bounded by limit and by the response budget; totalCount says how many rows the whole table holds."

Previous value: -"Rows in the whole table CDC returned, before limit/offset. Exact rather than estimated — the table is parsed in full before a page is taken from it."New value: +"Rows in the whole table CDC returned, before any page was taken. Exact rather than estimated — the table is parsed in full before a page is taken from it."

Previous value: -"Max rows to return (default 100, max 5000). Fewer come back when the page would cross the 200,000-character response budget; the response says so and gives a nextOffset to resume from."New value: +"Max rows to return (default 100, max 5000). Fewer come back when the page would carry the response past its 200,000-character budget, counted over the whole result — the rows as JSON and as the rendered table together; the response says so and gives a nextOffset to resume from."

Previous value: -"Guidance when no rows matched, when further rows remain, or when the response budget cut the page short — how to verify filters, resume paging, or broaden the query."New value: +"Guidance when no rows matched, when offset ran past the end of the result set, when further rows remain, or when the response budget cut the page short — how to verify filters, lower offset, resume paging, or broaden the query."

Previous value: -"Filter by domain category (e.g., \"NNDSS\", \"Vaccinations\", \"Behavioral Risk Factors\")."New value: +"Filter by domain category (e.g., \"NNDSS\", \"Vaccinations\", \"Behavioral Risk Factors\"). Values come from the catalog's own vocabulary and are matched exactly, including case — \"Vaccinations\" matches 89 entries while \"Vaccination\" matches none. Call cdc_list_catalog_vocabulary for every value with its entry count rather than guessing at one."

Previous value: -"Filter by domain tags (e.g., [\"covid19\", \"surveillance\"]). Tags widen the search instead of narrowing it — a dataset matches when it carries any one of them, so every tag added returns more results, and an unrecognized tag matches nothing and leaves the result set unchanged. Values match the catalog's own tag vocabulary, case-insensitively; the tags field on each result shows which values are in use. To narrow, combine tags with query or category, which intersect with the tag set."New value: +"Filter by domain tags (e.g., [\"covid19\", \"surveillance\"]). Tags widen the search instead of narrowing it — a dataset matches when it carries any one of them, so every tag added returns more results, and an unrecognized tag matches nothing and leaves the result set unchanged. Values match the catalog's own tag vocabulary, case-insensitively; call cdc_list_catalog_vocabulary for the values in use with their entry counts, or read the tags field on any result. To narrow, combine tags with query or category, which intersect with the tag set."

Previous value: -"Dataset description when provided by the catalog, truncated to 300 characters. Fetch the full text via cdc_get_dataset_schema."New value: +"Dataset description when provided by the catalog, as plain text — markup stripped and entity references decoded — then truncated to 300 characters, so the limit bounds visible text. Fetch the full text via cdc_get_dataset_schema."

Previous value: -"Guidance when the page came back empty — how to broaden a search that matched nothing, where to check tag values when a tag filter was applied, or the size of the result set when the offset ran past its end."New value: +"Guidance when the page came back empty — the catalog values closest to a category or tag filter that matched nothing, each with its entry count; how to broaden a search when no value is close; or the size of the result set when the offset ran past its end."

Previous value: -"Dataset description when provided."New value: +"Dataset description when provided, in full as plain text — markup stripped and entity references decoded. Never truncated here; cdc_discover_datasets is the surface that shortens it."

Previous value: -"Total number of rows when reported by upstream; omitted when unknown."New value: +"Total rows in the dataset; omitted when neither a live nor a cached figure is available. Read rowCountSource before sizing a pagination walk against it — the cached figure can understate an actively-updated dataset by a third or more."

Added value: +{
+  "description": "Provenance of rowCount. \"live\" is a count(*) run against the dataset for this call. \"cached\" is the figure Socrata stored when it last built its column cache, returned when the count request did not succeed; Socrata does not refresh it as rows land. Absent exactly when rowCount is absent.",
+  "enum": [
+    "live",
+    "cached"
+  ],
+  "type": "string"
+}

Previous value: -"Machine-readable failure mode. Declared by this tool: `dataset_not_found`: Dataset ID does not exist or has been retired. `no_such_column`: WHERE/SELECT/GROUP/ORDER references a column that does not exist on this dataset. `type_mismatch`: Filter value type does not match the column data type (e.g., quoting a number). `invalid_query`: Socrata rejected the SoQL query for other syntax or semantic reasons. `access_denied`: Socrata returned 403 — typically an ID naming a chart, map, story, file, or external link rather than a tabular dataset. `rate_limited`: Socrata API returns 429 Too Many Requests. `upstream_error`: Socrata data API returned a 5xx server error. Other values are possible when a failure originates below the handler."New value: +"Machine-readable failure mode. Declared by this tool: `dataset_not_found`: Dataset ID does not exist or has been retired. `no_such_column`: WHERE/SELECT/GROUP/ORDER references a column that does not exist on this dataset. `type_mismatch`: Filter value type does not match the column data type (e.g., quoting a number). `invalid_query`: Socrata rejected the SoQL query for other syntax or semantic reasons. `not_queryable`: The ID names a non-tabular asset: the data endpoint answered with rows carrying no fields, and the asset reports no columns. `access_denied`: Socrata returned 403 — typically an ID naming a story, file, or external link rather than a tabular dataset. `rate_limited`: Socrata API returns 429 Too Many Requests. `upstream_error`: Socrata data API returned a 5xx server error. Other values are possible when a failure originates below the handler."

Previous value: -[
-  "dataset_not_found",
-  "no_such_column",
-  "type_mismatch",
-  "invalid_query",
-  "access_denied",
-  "rate_limited",
-  "upstream_error"
-]New value: +[
+  "dataset_not_found",
+  "no_such_column",
+  "type_mismatch",
+  "invalid_query",
+  "not_queryable",
+  "access_denied",
+  "rate_limited",
+  "upstream_error"
+]

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]

Added value: +[
+  "string",
+  "number",
+  "null"
+]

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": [
+      "datasets",
+      "totalCount",
+      "appliedFilters"
+    ]
+  },
+  {
+    "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: `rate_limited`: Socrata API returns 429 Too Many Requests. `dataset_not_found`: Socrata returned 404 for the catalog endpoint itself — the Discovery API address is wrong or the service moved. `access_denied`: Socrata returned 403 — the catalog refused this request rather than failing to serve it. `upstream_error`: Socrata catalog API returned a 5xx server error. `page_out_of_range`: offset plus limit exceeds 10000, which Socrata's catalog rejects outright. `invalid_query`: Catalog API returned 400 — typically a malformed query or invalid filter value. Other values are possible when a failure originates below the handler.",
+          "examples": [
+            "rate_limited",
+            "dataset_not_found",
+            "access_denied",
+            "upstream_error",
+            "page_out_of_range",
+            "invalid_query"
+          ],
+          "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: -[
-  "datasets",
-  "totalCount",
-  "appliedFilters"
-]

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": [
+      "name",
+      "columns",
+      "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: `dataset_not_found`: Dataset ID does not exist or has been retired. `not_queryable`: The ID names a catalog asset with no columns — a chart, map, story, file, or external link rather than a tabular dataset. `access_denied`: Socrata returned 403 — the asset is not readable through this endpoint or access is restricted. `invalid_query`: Socrata rejected the metadata request with a 400. `rate_limited`: Socrata API returns 429 Too Many Requests. `upstream_error`: Socrata metadata API returned a 5xx server error. Other values are possible when a failure originates below the handler.",
+          "examples": [
+            "dataset_not_found",
+            "not_queryable",
+            "access_denied",
+            "invalid_query",
+            "rate_limited",
+            "upstream_error"
+          ],
+          "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: -[
-  "name",
-  "columns",
-  "totalCount"
-]

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": [
+      "rows",
+      "rowCount",
+      "effectiveQuery"
+    ]
+  },
+  {
+    "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: `dataset_not_found`: Dataset ID does not exist or has been retired. `no_such_column`: WHERE/SELECT/GROUP/ORDER references a column that does not exist on this dataset. `type_mismatch`: Filter value type does not match the column data type (e.g., quoting a number). `invalid_query`: Socrata rejected the SoQL query for other syntax or semantic reasons. `access_denied`: Socrata returned 403 — typically an ID naming a chart, map, story, file, or external link rather than a tabular dataset. `rate_limited`: Socrata API returns 429 Too Many Requests. `upstream_error`: Socrata data API returned a 5xx server error. Other values are possible when a failure originates below the handler.",
+          "examples": [
+            "dataset_not_found",
+            "no_such_column",
+            "type_mismatch",
+            "invalid_query",
+            "access_denied",
+            "rate_limited",
+            "upstream_error"
+          ],
+          "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: -[
-  "rows",
-  "rowCount",
-  "effectiveQuery"
-]

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": [
+      "rows",
+      "rowCount",
+      "database",
+      "databaseTitle",
+      "caveats",
+      "cellNotes",
+      "messages",
+      "suppressedCount",
+      "effectiveQuery",
+      "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: `invalid_query`: The request does not fit the selected database — a year_range outside the years it holds, mcd_icd10 against a database that records only the underlying cause, or the withheld-cause marker against one that keeps no withheld backlog — or WONDER itself rejected it, e.g. an unknown ICD-10 code or a filter/grouping combination it does not allow. `rate_limited`: A request reached WONDER less than 15 seconds after the previous response finished, and WONDER returned 429. `upstream_error`: WONDER returned an unexpected response or was unreachable. Other values are possible when a failure originates below the handler.",
+          "examples": [
+            "invalid_query",
+            "rate_limited",
+            "upstream_error"
+          ],
+          "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: -[
-  "rows",
-  "rowCount",
-  "database",
-  "databaseTitle",
-  "caveats",
-  "cellNotes",
-  "messages",
-  "suppressedCount",
-  "effectiveQuery",
-  "totalCount"
-]

Added value: +{
+  "default": 100,
+  "description": "Columns to return in this call (default 100, max 500). Every dataset under the default arrives whole; past it the response reports totalCount and a nextOffset to pass back as column_offset. Raise this to pull a wide schema in one call.",
+  "maximum": 500,
+  "minimum": 1,
+  "type": "integer"
+}

Added value: +{
+  "default": 0,
+  "description": "Index of the first column to return, for continuing past a previous call (default 0). Columns keep the order the dataset declares, so column_offset plus column_limit walks the schema without gaps or repeats. An offset at or past the column count returns an empty window rather than an error.",
+  "maximum": 10000,
+  "minimum": 0,
+  "type": "integer"
+}

Added value: +{
+  "description": "The column_limit that bounded this response.",
+  "type": "number"
+}

Previous value: -"Dataset columns with types and descriptions."New value: +"The requested window of dataset columns, with full types and descriptions. Bounded by column_limit/column_offset; the enrichment fields say how the window sits in the whole schema."

Added value: +{
+  "description": "Value to pass as column_offset on the next call to continue after the last column returned. Present only when columns remain beyond this window.",
+  "type": "number"
+}

Added value: +{
+  "description": "Guidance when the response is a subset of the schema — which columns it covers, how to reach the rest, or that column_offset ran past the end.",
+  "type": "string"
+}

Added value: +{
+  "description": "Number of columns returned in this response.",
+  "type": "number"
+}

Added value: +{
+  "description": "Total columns in the dataset schema, before column_limit/column_offset.",
+  "type": "number"
+}

Added value: +{
+  "description": "True when the returned columns are a subset of the schema. Absent means every column of the dataset is in this response.",
+  "type": "boolean"
+}

Previous value: -[
-  "name",
-  "columns"
-]New value: +[
+  "name",
+  "columns",
+  "totalCount"
+]

Previous value: -"Max rows to return (default 100, max 5000)."New value: +"Max rows to return (default 100, max 5000). Fewer come back when the page would cross the 200,000-character response budget; the response says so and gives a nextOffset to resume from."

Previous value: -"Row offset for pagination (max 1,000,000)."New value: +"Row offset for pagination (max 1,000,000). Pair with a deterministic order clause — an offset walk over unordered results can skip or repeat rows."

Previous value: -"SoQL ORDER BY clause. Field name with optional ASC/DESC: \"total_deaths DESC\"."New value: +"SoQL ORDER BY clause. Field name with optional ASC/DESC: \"total_deaths DESC\". Set one whenever paging with offset: SODA does not order results implicitly, so consecutive offsets without a deterministic order can skip or repeat rows. When the dataset has no natural unique column, Socrata's documented minimum tie-breaker is the system field `:id`, present on every dataset — order=\":id\"."

Added value: +{
+  "description": "Offset to pass on the next call to resume immediately after the last row returned. Present only when further rows exist and the resume point is within the offset ceiling; a deterministic order clause is what makes the walk gap-free.",
+  "type": "number"
+}

Previous value: -"Guidance when no rows matched or results were truncated — how to verify filters, paginate, or broaden the query."New value: +"Guidance when no rows matched, when further rows remain, or when the response budget cut the page short — how to verify filters, resume paging, or broaden the query."

Previous value: -"True when the result row count hit the requested limit and may be incomplete."New value: +"True when rows exist beyond the ones returned, established by fetching one row more than the limit rather than inferred from the row count. Absent means this response is the complete remainder of the result set."

Added value: +{
+  "description": "Rows to return from the table CDC sent (1–5000). Omit to return the whole table. WONDER's request carries no limit of its own, so this pages a table already fetched in full rather than narrowing the query: the deaths, rates, caveats and hidden-row notices are the same whichever page is read. A four-dimension grouping can run past a thousand rows, so set this and follow nextOffset to walk them.",
+  "maximum": 5000,
+  "minimum": 1,
+  "type": "integer"
+}

Added value: +{
+  "default": 0,
+  "description": "Index of the first row to return, for continuing past a previous call (default 0, max 10,000). Rows keep the order CDC returned them in, which is stable for a given query, so offset plus limit walks the table without gaps or repeats. An offset at or past the row total returns an empty page rather than an error.",
+  "maximum": 10000,
+  "minimum": 0,
+  "type": "integer"
+}

Added value: +{
+  "description": "The requested limit that bounded this response.",
+  "type": "number"
+}

Previous value: -"CDC-provided caveats and footnotes: data revisions, population-estimate sources, suppression and rate-reliability rules."New value: +"CDC-provided caveats and footnotes: data revisions, population-estimate sources, suppression and rate-reliability rules. They describe the whole table CDC assembled, so they come back complete on every page rather than scoped to the rows returned."

Previous value: -"One entry per measure cell CDC returned as a status token rather than a number. Those cells read null in rows, so this is what tells a withheld value apart from an unreliable one or a genuinely absent one."New value: +"One entry per measure cell CDC returned as a status token rather than a number, covering the rows in this response only. Those cells read null in rows, so this is what tells a withheld value apart from an unreliable one or a genuinely absent one."

Previous value: -"Zero-based index into rows."New value: +"Zero-based index into rows — the rows in this response, so it is relative to the page when limit or offset is set."

Previous value: -"Notices CDC attached to this table, verbatim. The ones that matter say rows were withheld before the table was sent — \"Rows with zero Deaths are hidden.\" and \"Rows with suppressed Deaths are hidden.\" A withheld row is absent from rows entirely, with nothing in the table marking the gap, so while this array is non-empty a stratum missing from rows may have been dropped rather than unobserved, and any count, ranking, or completeness claim drawn from rows is partial. Empty when CDC withheld no rows."New value: +"Notices CDC attached to this table, verbatim. The ones that matter say rows were withheld before the table was sent — \"Rows with zero Deaths are hidden.\" and \"Rows with suppressed Deaths are hidden.\" A withheld row is absent from rows entirely, with nothing in the table marking the gap, so while this array is non-empty a stratum missing from rows may have been dropped rather than unobserved, and any count, ranking, or completeness claim drawn from rows is partial. These describe the whole table, so they come back complete on every page. Empty when CDC withheld no rows."

Added value: +{
+  "description": "Offset to pass on the next call to resume immediately after the last row returned. Present only when further rows remain.",
+  "type": "number"
+}

Previous value: -"Guidance when no rows matched, and a note when CDC returned a status token in place of a measure value."New value: +"Guidance when no rows matched, when the returned rows are a page of a larger table or the offset ran past it, and a note when CDC returned a status token in place of a measure value."

Previous value: -"Number of rows returned."New value: +"Number of rows returned in this response — the page size when limit or offset is set."

Previous value: -"Result rows. Each carries the requested group-by dimensions plus deaths, population, crude_rate, and age_adjusted_rate (per 100,000) when age standardization is possible — it is omitted when age_group is a grouping dimension or age_groups selects a single group. Dimension values are CDC's own labels with only surrounding whitespace removed, so the same year keys identically across databases; nothing inside a label is changed, and on the provisional database a year reads \"2025 (provisional)\" or \"2026 (provisional and partial)\" rather than a bare year. A measure cell CDC returned as a status token instead of a number is null here; cellNotes names the cell and the token."New value: +"Result rows. Each carries the requested group-by dimensions plus deaths, population, crude_rate, and age_adjusted_rate (per 100,000) when age standardization is possible — it is omitted when age_group is a grouping dimension or age_groups selects a single group. Dimension values are CDC's own labels with only surrounding whitespace removed, so the same year keys identically across databases; nothing inside a label is changed, and on the provisional database a year reads \"2025 (provisional)\" or \"2026 (provisional and partial)\" rather than a bare year. A measure cell CDC returned as a status token instead of a number is null here; cellNotes names the cell and the token. When limit or offset is set these are one page of the table CDC sent, in its order; totalCount says how many rows the whole table holds."

Added value: +{
+  "description": "Number of rows returned in this response.",
+  "type": "number"
+}

Previous value: -"How many cellNotes carry the \"Suppressed\" token — cells CDC withheld for confidentiality."New value: +"How many cellNotes carry the \"Suppressed\" token — cells CDC withheld for confidentiality. Counted over the rows in this response, so it tracks the page rather than the whole table."

Added value: +{
+  "description": "Rows in the whole table CDC returned, before limit/offset. Exact rather than estimated — the table is parsed in full before a page is taken from it.",
+  "type": "number"
+}

Added value: +{
+  "description": "True when rows remain past the ones returned. Absent means this response runs to the end of the table, which is also the case for an offset past it.",
+  "type": "boolean"
+}

Previous value: -[
-  "rows",
-  "rowCount",
-  "database",
-  "databaseTitle",
-  "caveats",
-  "cellNotes",
-  "messages",
-  "suppressedCount",
-  "effectiveQuery"
-]New value: +[
+  "rows",
+  "rowCount",
+  "database",
+  "databaseTitle",
+  "caveats",
+  "cellNotes",
+  "messages",
+  "suppressedCount",
+  "effectiveQuery",
+  "totalCount"
+]

Previous value: -"CDC Socrata portal to search. \"data.cdc.gov\" (default) is the main CDC catalog; \"chronicdata.cdc.gov\" hosts chronic-disease and small-area datasets (PLACES, the Heart Disease & Stroke Atlas, Environmental Public Health Tracking)."New value: +"CDC Socrata host to search. \"data.cdc.gov\" (default) and \"chronicdata.cdc.gov\" front the same catalog and return the same entries, so switching hosts neither widens nor narrows a search — chronic-disease and small-area collections such as PLACES, the Heart Disease & Stroke Atlas, and Environmental Public Health Tracking are found from either."

Previous value: -"Results to return (default 10, max 100)."New value: +"Results to return (default 10, max 100). offset plus limit must not exceed 10000."

Previous value: -"Pagination offset for browsing beyond first page (max 9999)."New value: +"Pagination offset for browsing beyond first page (max 9999). offset plus limit must not exceed 10000; both CDC portals hold well under two thousand entries, so offsets near that ceiling page past the end of the catalog."

Previous value: -"Filter by domain tags (e.g., [\"covid19\", \"surveillance\"])."New value: +"Filter by domain tags (e.g., [\"covid19\", \"surveillance\"]). Tags widen the search instead of narrowing it — a dataset matches when it carries any one of them, so every tag added returns more results, and an unrecognized tag matches nothing and leaves the result set unchanged. Values match the catalog's own tag vocabulary, case-insensitively; the tags field on each result shows which values are in use. To narrow, combine tags with query or category, which intersect with the tag set."

Previous value: -"Filters applied to this query; absent fields indicate no filter on that dimension."New value: +"Filters applied to this query; absent fields indicate no filter on that dimension. Query, category, and tags intersect with each other, but multiple tags union."

Previous value: -"Tag filters used."New value: +"Tag filters used — a dataset matched when it carried any one of them."

Added value: +{
+  "description": "Catalog asset type as Socrata reports it — \"dataset\", \"filter\", \"chart\", \"map\", \"story\", \"file\", or \"href\". Descriptive only: \"filter\" entries carry real columns and query normally, while \"chart\" and \"map\" entries do not. Read columnCount, not this field, to decide whether an entry is queryable.",
+  "type": "string"
+}

Previous value: -"Number of columns in the dataset when reported by the catalog."New value: +"Number of columns in the dataset when reported by the catalog. A count of 0 means the entry is not tabular — cdc_get_dataset_schema and cdc_query_dataset return no usable data for it."

Previous value: -"Guidance when no datasets matched — echoes the applied filters and suggests how to broaden the search."New value: +"Guidance when the page came back empty — how to broaden a search that matched nothing, where to check tag values when a tag filter was applied, or the size of the result set when the offset ran past its end."

Previous value: -"CDC Socrata portal hosting the dataset. Use the same portal you found the dataset on via cdc_discover_datasets: \"data.cdc.gov\" (default) or \"chronicdata.cdc.gov\"."New value: +"CDC Socrata host to fetch the dataset from. \"data.cdc.gov\" (default) and \"chronicdata.cdc.gov\" front the same catalog, so a four-by-four ID resolves on either and the default works whichever host the dataset was found on."

Previous value: -"CDC Socrata portal hosting the dataset. Must match the portal the dataset lives on: \"data.cdc.gov\" (default) or \"chronicdata.cdc.gov\" (PLACES and other chronic-disease/small-area datasets)."New value: +"CDC Socrata host to query. \"data.cdc.gov\" (default) and \"chronicdata.cdc.gov\" front the same catalog, so a four-by-four ID returns the same rows from either and the default works whichever host the dataset was found on."

Previous value: -"Assembled SoQL query string sent to the Socrata API."New value: +"The SoQL clauses sent to Socrata, as `$clause=value` pairs joined by \"&\". Values read exactly as they were supplied — not URL-encoded — so a clause can be copied back into the matching parameter of another call."

Previous value: -"Restrict to specific ten-year age groups — e.g. [\"25-34\",\"35-44\"]. \"1\" is the under-1-year group. Omit for all ages."New value: +"Restrict to deaths in any of the listed age groups — e.g. [\"25-34\",\"35-44\"] covers both. \"1\" is the under-1-year group. \"NS\" is the group CDC puts a death in when the age was not recorded; it is not covered by any of the ten-year groups, so a filter listing all eleven of those still leaves those deaths out and returns fewer deaths than the same query unfiltered. List \"NS\" alongside them to match an unfiltered total, or on its own to count them. Omit for all ages, which includes them."

Previous value: -[
-  "1",
-  "1-4",
-  "5-14",
-  "15-24",
-  "25-34",
-  "35-44",
-  "45-54",
-  "55-64",
-  "65-74",
-  "75-84",
-  "85+"
-]New value: +[
+  "1",
+  "1-4",
+  "5-14",
+  "15-24",
+  "25-34",
+  "35-44",
+  "45-54",
+  "55-64",
+  "65-74",
+  "75-84",
+  "85+",
+  "NS"
+]

Previous value: -[
-  {
-    "const": "",
-    "type": "string"
-  },
-  {
-    "description": "ICD-10 underlying-cause code or chapter range. Ranges must match WONDER chapter boundaries exactly (an invalid code is rejected and named in the error) — valid examples: \"A00-B99\" (infectious), \"C00-C97\" (malignant neoplasms), \"I00-I99\" (circulatory), \"J00-J98\" (respiratory), \"V01-Y89\" (external causes), or a single code like \"I21\".",
-    "pattern": "^[A-Z][0-9]{2}(\\.[0-9]+)?(-[A-Z][0-9]{2}(\\.[0-9]+)?)?$",
-    "type": "string"
-  }
-]New value: +[
+  {
+    "const": "",
+    "type": "string"
+  },
+  {
+    "const": "999--999",
+    "type": "string"
+  },
+  {
+    "description": "ICD-10 underlying-cause code or chapter range. Ranges must match WONDER chapter boundaries exactly (an invalid code is rejected and named in the error) — valid examples: \"A00-B99\" (infectious), \"C00-C97\" (malignant neoplasms), \"I00-I99\" (circulatory), \"J00-J98\" (respiratory), \"V01-Y89\" (external causes), or a single code like \"I21\".",
+    "pattern": "^[A-Z][0-9]{2}(\\.[0-9]+)?(-[A-Z][0-9]{2}(\\.[0-9]+)?)?$",
+    "type": "string"
+  }
+]

Previous value: -"Filter to a specific ICD-10 underlying cause of death. Omit for all causes."New value: +"Filter to a specific ICD-10 underlying cause of death — the single condition CDC certified as having started the chain of events leading to death. Omit for all causes. Accepted by every database. \"999--999\" is not an ICD-10 code but CDC's own marker for deaths whose cause it is still withholding under the provisional database's six-month reporting lag; it counts that backlog, and only the \"provisional\" database offers it."

Added value: +{
+  "default": "underlying_1999_2020",
+  "description": "Which WONDER mortality database to query. \"underlying_1999_2020\" (D76) is final data for 1999–2020 and the default. \"provisional\" (D176) runs 2018 through the current year, updated weekly, and returns the most recent years labelled e.g. \"2025 (provisional)\". \"underlying_2018_2024\" (D158) is settled — not provisional — data for 2018–2024. \"multiple_1999_2020\" (D77) and \"multiple_2018_2024\" (D157) record every cause listed on the death certificate; without an mcd_icd10 filter they return the same figures as the underlying-cause database for the same era, so pick one only to use that filter. The two 1999–2020 databases report race in CDC's four bridged groups; the other three use the six single-race groups — figures broken out by race are not comparable between the two families.",
+  "enum": [
+    "underlying_1999_2020",
+    "provisional",
+    "underlying_2018_2024",
+    "multiple_1999_2020",
+    "multiple_2018_2024"
+  ],
+  "type": "string"
+}

Previous value: -"Dimensions to break results out by (1–4), in output-column order — e.g. [\"year\"], [\"year\",\"sex\"], [\"age_group\",\"race\"]. Results are always national. Cause of death is a filter (cause_icd10), not a grouping."New value: +"Dimensions to break results out by (1–4), in output-column order — e.g. [\"year\"], [\"year\",\"sex\"], [\"age_group\",\"race\"]. Results are always national. Cause of death is a filter (cause_icd10), not a grouping. \"race\" resolves to whichever race vocabulary the selected database uses — four bridged groups (Asian and Pacific Islander combined) on the 1999–2020 databases, six single-race groups plus a multiracial category on the others — so a race series from one family cannot be spliced onto one from the other."

Added value: +{
+  "anyOf": [
+    {
+      "const": "",
+      "type": "string"
+    },
+    {
+      "const": "999--999",
+      "type": "string"
+    },
+    {
+      "description": "ICD-10 code or chapter range, same form as cause_icd10 — e.g. \"J00-J98\" (respiratory), \"E00-E89\" (endocrine/metabolic), \"S00-T98\" (injury and poisoning, a chapter the underlying-cause finder does not list), or a single code like \"I21\".",
+      "pattern": "^[A-Z][0-9]{2}(\\.[0-9]+)?(-[A-Z][0-9]{2}(\\.[0-9]+)?)?$",
+      "type": "string"
+    }
+  ],
+  "description": "Filter to deaths with this ICD-10 code recorded anywhere on the death certificate, whether or not it was the underlying cause — e.g. \"died with a respiratory condition listed\", a population no underlying-cause query can produce. Valid only when database is \"multiple_1999_2020\", \"multiple_2018_2024\", or \"provisional\"; the other databases record only the underlying cause and reject it. \"999--999\", the withheld-cause marker described under cause_icd10, is offered here too but only by \"provisional\". Combines with cause_icd10, which keeps meaning the underlying cause. Omit for all causes."
+}

Previous value: -"Inclusive year range within 1999–2020. Omit for all years."New value: +"Inclusive year range. These bounds span every database (1999–2026); the years the selected one actually holds are narrower, and a range outside them is rejected with that database's span named. Omit for all years the database holds."

Previous value: -"First year (1999–2020)."New value: +"First year (1999–2026 across all databases; the selected one holds a narrower span)."

Previous value: -2020New value: +2026

Previous value: -"Last year (1999–2020)."New value: +"Last year (1999–2026 across all databases; the selected one holds a narrower span)."

Previous value: -2020New value: +2026

Added value: +{
+  "description": "One entry per measure cell CDC returned as a status token rather than a number. Those cells read null in rows, so this is what tells a withheld value apart from an unreliable one or a genuinely absent one.",
+  "items": {
+    "additionalProperties": false,
+    "description": "One flagged measure cell: where it is and what CDC put there.",
+    "properties": {
+      "column": {
+        "description": "Measure column whose numeric value the token replaced.",
+        "type": "string"
+      },
+      "row": {
+        "description": "Zero-based index into rows.",
+        "type": "number"
+      },
+      "token": {
+        "description": "Token CDC returned in place of a number: \"Suppressed\" (withheld for confidentiality, fewer than 10 persons), \"Unreliable\" (rate from fewer than 20 deaths — published, not withheld), or \"Not Applicable\" (no population denominator).",
+        "type": "string"
+      }
+    },
+    "required": [
+      "row",
+      "column",
+      "token"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

Previous value: -"WONDER database queried (D76 — Underlying Cause of Death, 1999–2020)."New value: +"WONDER dataset code the rows came from — e.g. \"D76\", \"D176\", \"D157\"."

Added value: +{
+  "description": "CDC's own title for that database, e.g. \"Underlying Cause of Death, 1999-2020\". Names the era and record type the rows describe, so a result read on its own is self-describing.",
+  "type": "string"
+}

Added value: +{
+  "description": "Notices CDC attached to this table, verbatim. The ones that matter say rows were withheld before the table was sent — \"Rows with zero Deaths are hidden.\" and \"Rows with suppressed Deaths are hidden.\" A withheld row is absent from rows entirely, with nothing in the table marking the gap, so while this array is non-empty a stratum missing from rows may have been dropped rather than unobserved, and any count, ranking, or completeness claim drawn from rows is partial. Empty when CDC withheld no rows.",
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}

Previous value: -"Guidance when no rows matched, or a note that CDC suppressed some cells."New value: +"Guidance when no rows matched, and a note when CDC returned a status token in place of a measure value."

Previous value: -"Result rows. Each carries the requested group-by dimensions plus deaths, population, crude_rate, and — unless grouped by age_group — age_adjusted_rate (per 100,000). Suppressed measure cells (< 10 deaths) are null."New value: +"Result rows. Each carries the requested group-by dimensions plus deaths, population, crude_rate, and age_adjusted_rate (per 100,000) when age standardization is possible — it is omitted when age_group is a grouping dimension or age_groups selects a single group. Dimension values are CDC's own labels with only surrounding whitespace removed, so the same year keys identically across databases; nothing inside a label is changed, and on the provisional database a year reads \"2025 (provisional)\" or \"2026 (provisional and partial)\" rather than a bare year. A measure cell CDC returned as a status token instead of a number is null here; cellNotes names the cell and the token."

Previous value: -"Number of measure cells CDC suppressed (< 10 deaths), returned as null."New value: +"How many cellNotes carry the \"Suppressed\" token — cells CDC withheld for confidentiality."

Previous value: -[
-  "rows",
-  "rowCount",
-  "database",
-  "caveats",
-  "suppressedCount",
-  "effectiveQuery"
-]New value: +[
+  "rows",
+  "rowCount",
+  "database",
+  "databaseTitle",
+  "caveats",
+  "cellNotes",
+  "messages",
+  "suppressedCount",
+  "effectiveQuery"
+]

Added value: +{
+  "default": "dataset_id",
+  "description": "Result ordering. \"dataset_id\" (default) sorts deterministically by each dataset's unique catalog ID — required for stable offset pagination, since consecutive pages form a gap-free, duplicate-free traversal. \"relevance\" returns best-match ranking for keyword search but is not stably paginable across pages, so walking offsets can skip or repeat datasets.",
+  "enum": [
+    "dataset_id",
+    "relevance"
+  ],
+  "type": "string"
+}

Previous value: -"Row offset for pagination."New value: +"Row offset for pagination (max 1,000,000)."

Previous value: -9007199254740991New value: +1000000

Added value: +{
+  "default": "data.cdc.gov",
+  "description": "CDC Socrata portal to search. \"data.cdc.gov\" (default) is the main CDC catalog; \"chronicdata.cdc.gov\" hosts chronic-disease and small-area datasets (PLACES, the Heart Disease & Stroke Atlas, Environmental Public Health Tracking).",
+  "enum": [
+    "data.cdc.gov",
+    "chronicdata.cdc.gov"
+  ],
+  "type": "string"
+}

Added value: +{
+  "description": "Number of columns in the dataset when reported by the catalog.",
+  "type": "number"
+}

Removed value: -{
-  "description": "Available column field names when provided.",
-  "items": {
-    "type": "string"
-  },
-  "type": "array"
-}

Added value: +{
+  "description": "First 8 column field names as a preview. Call cdc_get_dataset_schema for the full column list with data types.",
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}

Removed value: -{
-  "description": "Column data types (parallel to columnNames) when provided.",
-  "items": {
-    "type": "string"
-  },
-  "type": "array"
-}

Previous value: -"Dataset description when provided by the catalog."New value: +"Dataset description when provided by the catalog, truncated to 300 characters. Fetch the full text via cdc_get_dataset_schema."

Added value: +{
+  "default": "data.cdc.gov",
+  "description": "CDC Socrata portal hosting the dataset. Use the same portal you found the dataset on via cdc_discover_datasets: \"data.cdc.gov\" (default) or \"chronicdata.cdc.gov\".",
+  "enum": [
+    "data.cdc.gov",
+    "chronicdata.cdc.gov"
+  ],
+  "type": "string"
+}

Added value: +{
+  "default": "data.cdc.gov",
+  "description": "CDC Socrata portal hosting the dataset. Must match the portal the dataset lives on: \"data.cdc.gov\" (default) or \"chronicdata.cdc.gov\" (PLACES and other chronic-disease/small-area datasets).",
+  "enum": [
+    "data.cdc.gov",
+    "chronicdata.cdc.gov"
+  ],
+  "type": "string"
+}

Previous value: -"SoQL WHERE clause. Strings must be single-quoted: \"state='California' AND year=2020\"."New value: +"SoQL WHERE clause. Strings must be single-quoted: \"state='California' AND year=2020\". If a column name matches a SoQL keyword (group, select, where, order, limit, offset, having, search), wrap it in backticks: \"`group`='By Year'\"."

Added value: +{
+  "description": "The requested limit that bounded this response.",
+  "type": "number"
+}

Previous value: -"Guidance when no rows matched — suggests how to verify filter values or broaden the WHERE clause."New value: +"Guidance when no rows matched or results were truncated — how to verify filters, paginate, or broaden the query."

Added value: +{
+  "description": "Number of rows returned in this response.",
+  "type": "number"
+}

Added value: +{
+  "description": "True when the result row count hit the requested limit and may be incomplete.",
+  "type": "boolean"
+}

Previous value: -"Four-by-four dataset identifier (e.g., \"bi63-dtpu\")."New value: +"Four-by-four dataset identifier (e.g., \"bi63-dtpu\"). Obtain from cdc_discover_datasets."

Previous value: -"Filters that were applied to this query; absent fields indicate no filter on that dimension."New value: +"Filters applied to this query; absent fields indicate no filter on that dimension."

Added value: +{
+  "description": "Guidance when no datasets matched — echoes the applied filters and suggests how to broaden the search.",
+  "type": "string"
+}

Previous value: -"Total matching datasets (for pagination)."New value: +"Total matching datasets in the catalog (for pagination)."

Added value: +{
+  "description": "Assembled SoQL query string sent to the Socrata API.",
+  "type": "string"
+}

Added value: +{
+  "description": "Guidance when no rows matched — suggests how to verify filter values or broaden the WHERE clause.",
+  "type": "string"
+}

Removed value: -{
-  "description": "Assembled SoQL query string sent to Socrata.",
-  "type": "string"
-}

Previous value: -[
-  "rows",
-  "rowCount",
-  "query"
-]New value: +[
+  "rows",
+  "rowCount",
+  "effectiveQuery"
+]