chore(task): regen golden schemas after rebase; relax semver enum lint

Rebased onto upstream/main (which merged the server-side SEP-1686 task
variants). Regenerate the `test_message_schema` golden files so they
reflect both the upstream changes and this PR's new `ServerRequest` /
`ClientResult` task variants (and drop the renamed `CancelTask*` defs).

Add `[package.metadata.cargo-semver-checks.lints] enum_variant_added =
"allow"`: the `ts_union!` protocol enums are intentionally exhaustive and
gain a variant per spec revision. Those additions are non-breaking for
downstream consumers (untagged serde + generated `From` impls), so the
default `enum_variant_added` major-break classification is noise for this
crate. The remaining semver-checks failures are the deliberate
`tasks/cancel` -> `tasks/delete` removals.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: TheUnderdev

crates/rmcp/Cargo.toml

@@ -42,6 +42,16 @@ features = [
 ]
 rustdoc-args = ["--cfg", "docsrs"]
 
+# The protocol message unions in `model.rs` (`ClientRequest`, `ServerRequest`,
+# `ClientResult`, `ServerResult`, …) are generated by `ts_union!` and are
+# intentionally `#[non_exhaustive]`-free (see the `clippy::exhaustive_enums`
+# expectation on the macro): each new spec revision adds message variants.
+# Adding a variant is non-breaking for downstream consumers — the enums are
+# `#[serde(untagged)]` and gain `From` impls — so `enum_variant_added` is
+# expected churn rather than a true semver break.
+[package.metadata.cargo-semver-checks.lints]
+enum_variant_added = "allow"
+
 [dependencies]
 async-trait = "0.1.89"
 serde = { version = "1.0", features = ["derive", "rc"] }

crates/rmcp/tests/test_message_schema/client_json_rpc_message_schema.json

@@ -224,94 +224,6 @@
         "name"
       ]
     },
-    "CancelTaskMethod": {
-      "type": "string",
-      "format": "const",
-      "const": "tasks/cancel"
-    },
-    "CancelTaskParams": {
-      "type": "object",
-      "properties": {
-        "_meta": {
-          "description": "Protocol-level metadata for this request (SEP-1319)",
-          "type": [
-            "object",
-            "null"
-          ],
-          "additionalProperties": true
-        },
-        "taskId": {
-          "type": "string"
-        }
-      },
-      "required": [
-        "taskId"
-      ]
-    },
-    "CancelTaskResult": {
-      "description": "Response to a `tasks/cancel` request.\n\nPer spec, `CancelTaskResult = allOf[Result, Task]` — same shape as `GetTaskResult`.",
-      "type": "object",
-      "properties": {
-        "_meta": {
-          "type": [
-            "object",
-            "null"
-          ],
-          "additionalProperties": true
-        },
-        "createdAt": {
-          "description": "ISO-8601 creation timestamp.",
-          "type": "string"
-        },
-        "lastUpdatedAt": {
-          "description": "ISO-8601 timestamp for the most recent status change.",
-          "type": "string"
-        },
-        "pollInterval": {
-          "description": "Suggested polling interval (milliseconds).",
-          "type": [
-            "integer",
-            "null"
-          ],
-          "format": "uint64",
-          "minimum": 0
-        },
-        "status": {
-          "description": "Current lifecycle status (see [`TaskStatus`]).",
-          "allOf": [
-            {
-              "$ref": "#/definitions/TaskStatus"
-            }
-          ]
-        },
-        "statusMessage": {
-          "description": "Optional human-readable status message for UI surfaces.",
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "taskId": {
-          "description": "Unique task identifier generated by the receiver.",
-          "type": "string"
-        },
-        "ttl": {
-          "description": "Retention window in milliseconds that the receiver agreed to honor.\n`None` (serialized as `null`) means unlimited retention.",
-          "type": [
-            "integer",
-            "null"
-          ],
-          "format": "uint64",
-          "minimum": 0
-        }
-      },
-      "required": [
-        "taskId",
-        "status",
-        "createdAt",
-        "lastUpdatedAt"
-      ]
-    },
     "CancelledNotificationMethod": {
       "type": "string",
       "format": "const",
@@ -426,7 +338,7 @@
           "$ref": "#/definitions/GetTaskPayloadResult"
         },
         {
-          "$ref": "#/definitions/CancelTaskResult"
+          "$ref": "#/definitions/DeleteTaskResult"
         },
         {
           "$ref": "#/definitions/EmptyObject"
@@ -593,6 +505,43 @@
     "CustomResult": {
       "description": "A catch-all response either side can use for custom requests."
     },
+    "DeleteTaskMethod": {
+      "type": "string",
+      "format": "const",
+      "const": "tasks/delete"
+    },
+    "DeleteTaskParams": {
+      "type": "object",
+      "properties": {
+        "_meta": {
+          "description": "Protocol-level metadata for this request (SEP-1319)",
+          "type": [
+            "object",
+            "null"
+          ],
+          "additionalProperties": true
+        },
+        "taskId": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "taskId"
+      ]
+    },
+    "DeleteTaskResult": {
+      "description": "Response to a `tasks/delete` request.\n\nPer SEP-1686 §3.6, the result carries only protocol-level metadata.",
+      "type": "object",
+      "properties": {
+        "_meta": {
+          "type": [
+            "object",
+            "null"
+          ],
+          "additionalProperties": true
+        }
+      }
+    },
     "ElicitationAction": {
       "description": "Represents the possible actions a user can take in response to an elicitation request.\n\nWhen a server requests user input through elicitation, the user can:\n- Accept: Provide the requested information and continue\n- Decline: Refuse to provide the information but continue the operation\n- Cancel: Stop the entire operation",
       "oneOf": [
@@ -1624,10 +1573,10 @@
       "type": "object",
       "properties": {
         "method": {
-          "$ref": "#/definitions/CancelTaskMethod"
+          "$ref": "#/definitions/DeleteTaskMethod"
         },
         "params": {
-          "$ref": "#/definitions/CancelTaskParams"
+          "$ref": "#/definitions/DeleteTaskParams"
         }
       },
       "required": [

crates/rmcp/tests/test_message_schema/client_json_rpc_message_schema_current.json

@@ -224,94 +224,6 @@
         "name"
       ]
     },
-    "CancelTaskMethod": {
-      "type": "string",
-      "format": "const",
-      "const": "tasks/cancel"
-    },
-    "CancelTaskParams": {
-      "type": "object",
-      "properties": {
-        "_meta": {
-          "description": "Protocol-level metadata for this request (SEP-1319)",
-          "type": [
-            "object",
-            "null"
-          ],
-          "additionalProperties": true
-        },
-        "taskId": {
-          "type": "string"
-        }
-      },
-      "required": [
-        "taskId"
-      ]
-    },
-    "CancelTaskResult": {
-      "description": "Response to a `tasks/cancel` request.\n\nPer spec, `CancelTaskResult = allOf[Result, Task]` — same shape as `GetTaskResult`.",
-      "type": "object",
-      "properties": {
-        "_meta": {
-          "type": [
-            "object",
-            "null"
-          ],
-          "additionalProperties": true
-        },
-        "createdAt": {
-          "description": "ISO-8601 creation timestamp.",
-          "type": "string"
-        },
-        "lastUpdatedAt": {
-          "description": "ISO-8601 timestamp for the most recent status change.",
-          "type": "string"
-        },
-        "pollInterval": {
-          "description": "Suggested polling interval (milliseconds).",
-          "type": [
-            "integer",
-            "null"
-          ],
-          "format": "uint64",
-          "minimum": 0
-        },
-        "status": {
-          "description": "Current lifecycle status (see [`TaskStatus`]).",
-          "allOf": [
-            {
-              "$ref": "#/definitions/TaskStatus"
-            }
-          ]
-        },
-        "statusMessage": {
-          "description": "Optional human-readable status message for UI surfaces.",
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "taskId": {
-          "description": "Unique task identifier generated by the receiver.",
-          "type": "string"
-        },
-        "ttl": {
-          "description": "Retention window in milliseconds that the receiver agreed to honor.\n`None` (serialized as `null`) means unlimited retention.",
-          "type": [
-            "integer",
-            "null"
-          ],
-          "format": "uint64",
-          "minimum": 0
-        }
-      },
-      "required": [
-        "taskId",
-        "status",
-        "createdAt",
-        "lastUpdatedAt"
-      ]
-    },
     "CancelledNotificationMethod": {
       "type": "string",
       "format": "const",
@@ -426,7 +338,7 @@
           "$ref": "#/definitions/GetTaskPayloadResult"
         },
         {
-          "$ref": "#/definitions/CancelTaskResult"
+          "$ref": "#/definitions/DeleteTaskResult"
         },
         {
           "$ref": "#/definitions/EmptyObject"
@@ -593,6 +505,43 @@
     "CustomResult": {
       "description": "A catch-all response either side can use for custom requests."
     },
+    "DeleteTaskMethod": {
+      "type": "string",
+      "format": "const",
+      "const": "tasks/delete"
+    },
+    "DeleteTaskParams": {
+      "type": "object",
+      "properties": {
+        "_meta": {
+          "description": "Protocol-level metadata for this request (SEP-1319)",
+          "type": [
+            "object",
+            "null"
+          ],
+          "additionalProperties": true
+        },
+        "taskId": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "taskId"
+      ]
+    },
+    "DeleteTaskResult": {
+      "description": "Response to a `tasks/delete` request.\n\nPer SEP-1686 §3.6, the result carries only protocol-level metadata.",
+      "type": "object",
+      "properties": {
+        "_meta": {
+          "type": [
+            "object",
+            "null"
+          ],
+          "additionalProperties": true
+        }
+      }
+    },
     "ElicitationAction": {
       "description": "Represents the possible actions a user can take in response to an elicitation request.\n\nWhen a server requests user input through elicitation, the user can:\n- Accept: Provide the requested information and continue\n- Decline: Refuse to provide the information but continue the operation\n- Cancel: Stop the entire operation",
       "oneOf": [
@@ -1624,10 +1573,10 @@
       "type": "object",
       "properties": {
         "method": {
-          "$ref": "#/definitions/CancelTaskMethod"
+          "$ref": "#/definitions/DeleteTaskMethod"
         },
         "params": {
-          "$ref": "#/definitions/CancelTaskParams"
+          "$ref": "#/definitions/DeleteTaskParams"
         }
       },
       "required": [