Previous value: -"Maximum number of journals to return for title queries, or works when include_works is true (1–100, default 10)"New value: +"Maximum number of journals to return for title queries, or works when include_works is true (1–100 per call, default 10). A larger value, up to 1000, returns 100 and says so in notice; nextOffset and nextWorksOffset continue after the records returned."

Previous value: -100New value: +1000

Added value: +{
+  "description": "DOIs issued before the current window",
+  "type": "number"
+}

Added value: +{
+  "description": "Per-category metadata deposit coverage for this journal — each a 0–1 fraction split into current and backfile DOIs. Signals how completely the journal deposits abstracts, references, ORCIDs, funders, licenses, and similar metadata. A window with no DOIs reports every fraction as 0, so read each fraction beside currentDois and backfileDois.",
+  "items": {
+    "additionalProperties": false,
+    "description": "Metadata deposit coverage for one category",
+    "properties": {
+      "backfile": {
+        "description": "Coverage fraction (0–1) among backfile (older) DOIs",
+        "type": "number"
+      },
+      "category": {
+        "description": "Metadata deposit category, e.g. \"references\", \"abstracts\", \"orcids\", \"funders\", \"licenses\", \"affiliations\"",
+        "type": "string"
+      },
+      "current": {
+        "description": "Coverage fraction (0–1) among current (recent) DOIs",
+        "type": "number"
+      }
+    },
+    "required": [
+      "category"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

Added value: +{
+  "description": "DOIs issued in the current window — this year and the two before it",
+  "type": "number"
+}

Added value: +{
+  "description": "Registered DOIs per issued year, ascending by year; a year with no DOIs has no entry. Returned on an issn lookup only — title-query results omit it.",
+  "items": {
+    "additionalProperties": false,
+    "description": "DOI count for one issued year",
+    "properties": {
+      "count": {
+        "description": "DOIs issued that year",
+        "type": "number"
+      },
+      "year": {
+        "description": "Issued year",
+        "type": "number"
+      }
+    },
+    "required": [
+      "year",
+      "count"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

Previous value: -"Linking ISSN (ISSN-L). Absent when the journal has no linking ISSN registered — Crossref reports that as an explicit null rather than an omitted key."New value: +"Linking ISSN (ISSN-L). Crossref journal records do not carry one, so this is normally absent; issnTypes says which ISSN is print and which electronic."

Added value: +{
+  "description": "Each ISSN with its form — print or electronic",
+  "items": {
+    "additionalProperties": false,
+    "description": "One ISSN and its form",
+    "properties": {
+      "type": {
+        "description": "ISSN form, e.g. \"print\" or \"electronic\". Absent when Crossref records no form for this ISSN.",
+        "type": "string"
+      },
+      "value": {
+        "description": "ISSN",
+        "type": "string"
+      }
+    },
+    "required": [
+      "value"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

Previous value: -"Guidance on a page that needs a caveat: a query nothing matched, an offset or works_offset past the end of a list that did match, a page that stops at one of the route offset ceilings with records still unretrieved, an include_works request that was skipped because the matched journal has no registered ISSN to address its works list by, or a query or issn supplied blank with nothing else to search by, so the page lists every journal unfiltered. Absent otherwise. A page needing more than one caveat carries them all in this one string."New value: +"Guidance on a page that needs a caveat: a query nothing matched, an offset or works_offset past the end of a list that did match, a page that stops at one of the route offset ceilings with records still unretrieved (naming the offset and smaller rows that reach the last records below the ceiling, when any remain), an include_works request that was skipped because the matched journal has no registered ISSN to address its works list by, a query or issn supplied blank with nothing else to search by, so the page lists every journal unfiltered, or a rows value above its per-call cap, naming the value requested and the cap applied. Absent otherwise. A page needing more than one caveat carries them all in this one string."

Previous value: -"When true, also return a page of the journal's most recent works by publication date. Requires an unambiguous journal — pass issn when a title query matches more than one. A journal with no ISSN registered has no addressable works list; the works lookup is then skipped and the notice enrichment says so."New value: +"When true, also return a page of the journal's most recent works — newest published first on an offset page, newest registered first on a works_cursor walk. Requires an unambiguous journal — pass issn when a title query matches more than one. A journal with no ISSN registered has no addressable works list; the works lookup is then skipped and the notice enrichment says so."

Added value: +[
+  {
+    "const": "",
+    "type": "string"
+  },
+  {
+    "description": "ISSN, e.g. \"1234-5678\"",
+    "pattern": "^\\d{4}-?\\d{3}[\\dX]$",
+    "type": "string"
+  }
+]

Removed value: -"^\\d{4}-?\\d{3}[\\dX]$"

Removed value: -"string"

Previous value: -"number"New value: +"integer"

Previous value: -"Cursor token for deep paging of the journal works list when include_works is true. Pass \"*\" to start the walk at the newest work, then pass the nextWorksCursor value from each response. Has no offset ceiling and cannot be combined with works_offset. Each token runs about 1500 characters and is returned on both result surfaces, a fixed cost per page — raise rows to spread it across more works on a long walk."New value: +"Cursor token for deep paging of the journal works list when include_works is true. Pass \"*\" to start the walk at the most recently registered work, then pass the nextWorksCursor value from each response. A walk runs by the date each DOI was registered with Crossref, newest first, not by publication date — Crossref does not walk a publication-date sort by cursor. Has no offset ceiling and cannot be combined with works_offset."

Previous value: -"Machine-readable failure mode. Declared by this tool: `rate_limited`: Crossref answered HTTP 429 and the limit did not clear inside the retry budget. `upstream_unavailable`: Crossref was unreachable, returned a 5xx status, or served an HTML error page instead of JSON. `malformed_response`: Crossref returned HTTP 200 with a body that is not valid JSON. `request_timeout`: Crossref did not respond within CROSSREF_TIMEOUT_MS, or answered HTTP 408/504. `issn_not_found`: ISSN lookup returned 404 — ISSN is not registered in Crossref. `ambiguous_journal`: include_works is true but the title query matched more than one journal, making the target ambiguous. `offset_too_large`: offset + rows exceeds the 100000-record ceiling Crossref allows on journal title search. `works_offset_too_large`: works_offset + rows exceeds the 10000-record ceiling Crossref allows on a journal works list. `works_cursor_offset_conflict`: include_works is true and works_cursor was supplied alongside a works_offset above zero. Other values are possible when a failure originates below the handler."New value: +"Machine-readable failure mode. Declared by this tool: `rate_limited`: Crossref answered HTTP 429 and the limit did not clear inside the retry budget. `upstream_unavailable`: Crossref was unreachable, returned a 5xx status, or served an HTML error page instead of JSON. `malformed_response`: Crossref returned HTTP 200 with a body that is not valid JSON. `request_timeout`: Crossref did not respond within CROSSREF_TIMEOUT_MS, or answered HTTP 408/504. `invalid_cursor`: Crossref did not recognize the cursor token (HTTP 404 cursor-invalid). `invalid_parameter`: Crossref rejected a parameter value (a filter value of the wrong type or form), or answered HTTP 400 with a body that did not parse. `issn_not_found`: ISSN lookup returned 404 — ISSN is not registered in Crossref. `ambiguous_journal`: include_works is true but the title query matched more than one journal, making the target ambiguous. `offset_too_large`: offset + rows exceeds the 100000-record ceiling Crossref allows on journal title search. `works_offset_too_large`: works_offset + rows exceeds the 10000-record ceiling Crossref allows on a journal works list. `works_cursor_offset_conflict`: include_works is true and works_cursor was supplied alongside a works_offset above zero. Other values are possible when a failure originates below the handler."

Previous value: -[
-  "rate_limited",
-  "upstream_unavailable",
-  "malformed_response",
-  "request_timeout",
-  "issn_not_found",
-  "ambiguous_journal",
-  "offset_too_large",
-  "works_offset_too_large",
-  "works_cursor_offset_conflict"
-]New value: +[
+  "rate_limited",
+  "upstream_unavailable",
+  "malformed_response",
+  "request_timeout",
+  "invalid_cursor",
+  "invalid_parameter",
+  "issn_not_found",
+  "ambiguous_journal",
+  "offset_too_large",
+  "works_offset_too_large",
+  "works_cursor_offset_conflict"
+]

Previous value: -"Guidance on a page that needs a caveat: a query nothing matched, an offset past the end of a list that did match, a page that stops at one of the route offset ceilings with records still unretrieved, or an include_works request that was skipped because the matched journal has no registered ISSN to address its works list by. Absent otherwise."New value: +"Guidance on a page that needs a caveat: a query nothing matched, an offset or works_offset past the end of a list that did match, a page that stops at one of the route offset ceilings with records still unretrieved, an include_works request that was skipped because the matched journal has no registered ISSN to address its works list by, or a query or issn supplied blank with nothing else to search by, so the page lists every journal unfiltered. Absent otherwise. A page needing more than one caveat carries them all in this one string."

Previous value: -"Page of works from the matched journal, ordered by publication date (newest first). Requires include_works, and absent even then when the matched journal has no registered ISSN — the works list is addressable by ISSN alone, and the notice enrichment says so."New value: +"Page of works from the matched journal, newest first — by publication date on an offset page, by Crossref registration date on a works_cursor page. Requires include_works, and absent even then when the matched journal has no registered ISSN — the works list is addressable by ISSN alone, and the notice enrichment says so."