Added value: +{
+  "description": "Submission IDs in this window whose fetch failed after retries. They are not deleted or missing and may load on a later call: retry with the same submissionOffset, or pass an ID to hn_get_thread to fetch that item alone. Absent when every submission in the window loaded.",
+  "items": {
+    "type": "number"
+  },
+  "type": "array"
+}

Previous value: -"Pagination context — which window of the history this page covers and the submissionOffset to send next, or a warning that the offset is past the end. Absent when the page reaches the end of the history, or when no submissions were resolved."New value: +"Pagination context — which window of the history this page covers and the submissionOffset to send next, the submission IDs that failed to load and how to retry them, or a warning that the offset is past the end. Absent when the page reaches the end of the history with no failed IDs, or when no submissions were resolved."

Previous value: -"One page of submissions, most recent first, starting at submissionOffset. Absent when includeSubmissions is false or the user has never submitted. Empty when the page holds no live items — either the offset is past the end, or every item in the window was deleted or flagged."New value: +"One page of submissions, most recent first, starting at submissionOffset. Absent when includeSubmissions is false or the user has never submitted. Empty when the page holds no live items — either the offset is past the end, or every item in the window was deleted, flagged, or failed to load (failedIds lists the failures)."

Previous value: -"A single submission by the user (story, comment, job, or poll)."New value: +"A single submission by the user (story, comment, job, poll, or poll option)."

Added value: +{
+  "description": "For a comment, the ID of the story or comment it replied to — pass it to hn_get_thread for the context.",
+  "type": "number"
+}

Added value: +{
+  "description": "For a poll option, the ID of its poll.",
+  "type": "number"
+}

Previous value: -"Item type (story, comment, job, poll)."New value: +"Item type (story, comment, job, poll, pollopt)."

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": [
+      "user"
+    ]
+  },
+  {
+    "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: `user_not_found`: HN reports no user account exists for the given username. `upstream_rejected`: The HN API answered with a 4xx status other than 429 — it rejected the request as built, which a username outside HN’s charset can cause. `upstream_rate_limited`: The HN API answered with HTTP 429. `upstream_unavailable`: The HN API answered with a 5xx status. `upstream_html`: The HN API served an HTML error page with a 200 status, which it does under rate limiting or maintenance. `upstream_malformed`: The HN API answered with a 200 status and a body that is not JSON. Other values are possible when a failure originates below the handler.",
+          "examples": [
+            "user_not_found",
+            "upstream_rejected",
+            "upstream_rate_limited",
+            "upstream_unavailable",
+            "upstream_html",
+            "upstream_malformed"
+          ],
+          "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: -[
-  "user"
-]

Previous value: -"Number of recent submissions to resolve. Only used when includeSubmissions is true."New value: +"Page size — how many submissions to resolve per call. Only used when includeSubmissions is true."

Added value: +{
+  "default": 0,
+  "description": "How many submissions to skip before resolving, counting back from the most recent. Use with submissionCount to page through a long history: request offset 0, then offset submissionCount, and so on. The enrichment block echoes submissionOffset and, when more remain, the offset to send next. Only used when includeSubmissions is true.",
+  "maximum": 9007199254740991,
+  "minimum": 0,
+  "type": "integer"
+}

Previous value: -"Pagination caveat when submissions were truncated. Absent when all submissions fit within the requested count or includeSubmissions is false."New value: +"Pagination context — which window of the history this page covers and the submissionOffset to send next, or a warning that the offset is past the end. Absent when the page reaches the end of the history, or when no submissions were resolved."

Added value: +{
+  "description": "The offset this page started at. Absent when includeSubmissions is false or the user has never submitted.",
+  "type": "number"
+}

Previous value: -"Recent submissions, most recent first. Only present when includeSubmissions is true."New value: +"One page of submissions, most recent first, starting at submissionOffset. Absent when includeSubmissions is false or the user has never submitted. Empty when the page holds no live items — either the offset is past the end, or every item in the window was deleted or flagged."

Previous value: -"True when submissions were capped by submissionCount."New value: +"True when submissions remain beyond this page."

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

Previous value: -"HN username. Case-sensitive."New value: +"HN username. Case-sensitive. Trimmed; blank or whitespace-only input is rejected."

Added value: +{
+  "description": "The submissionCount cap that was applied.",
+  "type": "number"
+}

Added value: +{
+  "description": "Number of submissions returned.",
+  "type": "number"
+}

Added value: +{
+  "description": "True when submissions were capped by submissionCount.",
+  "type": "boolean"
+}

Added value: +{
+  "description": "Pagination caveat when submissions were truncated. Absent when all submissions fit within the requested count or includeSubmissions is false.",
+  "type": "string"
+}

Added value: +"A single submission by the user (story, comment, job, or poll)."