feat: make _meta required in RequestParams and update examples

kurtisvg · kurtisvg · commit d6b27640210e · 2026-05-08T20:50:18.000-06:00
diff --git a/docs/specification/draft/schema.mdx b/docs/specification/draft/schema.mdx
diff --git a/schema/draft/examples/CallToolRequest/call-tool-request.json b/schema/draft/examples/CallToolRequest/call-tool-request.json
@@ -3,6 +3,14 @@
   "id": "call-tool-example",
   "method": "tools/call",
   "params": {
+    "_meta": {
+      "io.modelcontextprotocol/protocolVersion": "DRAFT-2026-v1",
+      "io.modelcontextprotocol/clientInfo": {
+        "name": "ExampleClient",
+        "version": "1.0.0"
+      },
+      "io.modelcontextprotocol/clientCapabilities": {}
+    },
     "name": "get_weather",
     "arguments": {
       "location": "New York"
diff --git a/schema/draft/examples/CallToolRequestParams/get-weather-tool-call-params.json b/schema/draft/examples/CallToolRequestParams/get-weather-tool-call-params.json
@@ -1,4 +1,12 @@
 {
+  "_meta": {
+    "io.modelcontextprotocol/protocolVersion": "DRAFT-2026-v1",
+    "io.modelcontextprotocol/clientInfo": {
+      "name": "ExampleClient",
+      "version": "1.0.0"
+    },
+    "io.modelcontextprotocol/clientCapabilities": {}
+  },
   "name": "get_weather",
   "arguments": {
     "location": "New York"
diff --git a/schema/draft/examples/CompleteRequest/completion-request.json b/schema/draft/examples/CompleteRequest/completion-request.json
@@ -3,6 +3,14 @@
   "id": "completion-example",
   "method": "completion/complete",
   "params": {
+    "_meta": {
+      "io.modelcontextprotocol/protocolVersion": "DRAFT-2026-v1",
+      "io.modelcontextprotocol/clientInfo": {
+        "name": "ExampleClient",
+        "version": "1.0.0"
+      },
+      "io.modelcontextprotocol/clientCapabilities": {}
+    },
     "ref": {
       "type": "ref/prompt",
       "name": "code_review"
diff --git a/schema/draft/examples/CompleteRequestParams/prompt-argument-completion-with-context.json b/schema/draft/examples/CompleteRequestParams/prompt-argument-completion-with-context.json
@@ -1,4 +1,12 @@
 {
+  "_meta": {
+    "io.modelcontextprotocol/protocolVersion": "DRAFT-2026-v1",
+    "io.modelcontextprotocol/clientInfo": {
+      "name": "ExampleClient",
+      "version": "1.0.0"
+    },
+    "io.modelcontextprotocol/clientCapabilities": {}
+  },
   "ref": {
     "type": "ref/prompt",
     "name": "code_review"
diff --git a/schema/draft/examples/CompleteRequestParams/prompt-argument-completion.json b/schema/draft/examples/CompleteRequestParams/prompt-argument-completion.json
@@ -1,4 +1,12 @@
 {
+  "_meta": {
+    "io.modelcontextprotocol/protocolVersion": "DRAFT-2026-v1",
+    "io.modelcontextprotocol/clientInfo": {
+      "name": "ExampleClient",
+      "version": "1.0.0"
+    },
+    "io.modelcontextprotocol/clientCapabilities": {}
+  },
   "ref": {
     "type": "ref/prompt",
     "name": "code_review"
diff --git a/schema/draft/examples/GetPromptRequest/get-prompt-request.json b/schema/draft/examples/GetPromptRequest/get-prompt-request.json
@@ -3,6 +3,14 @@
   "id": "get-prompt-example",
   "method": "prompts/get",
   "params": {
+    "_meta": {
+      "io.modelcontextprotocol/protocolVersion": "DRAFT-2026-v1",
+      "io.modelcontextprotocol/clientInfo": {
+        "name": "ExampleClient",
+        "version": "1.0.0"
+      },
+      "io.modelcontextprotocol/clientCapabilities": {}
+    },
     "name": "code_review",
     "arguments": {
       "code": "def hello():\n    print('world')"
diff --git a/schema/draft/examples/GetPromptRequestParams/get-code-review-prompt.json b/schema/draft/examples/GetPromptRequestParams/get-code-review-prompt.json
@@ -1,4 +1,12 @@
 {
+  "_meta": {
+    "io.modelcontextprotocol/protocolVersion": "DRAFT-2026-v1",
+    "io.modelcontextprotocol/clientInfo": {
+      "name": "ExampleClient",
+      "version": "1.0.0"
+    },
+    "io.modelcontextprotocol/clientCapabilities": {}
+  },
   "name": "code_review",
   "arguments": {
     "code": "def hello():\n    print('world')"
diff --git a/schema/draft/examples/PaginatedRequestParams/list-with-cursor.json b/schema/draft/examples/PaginatedRequestParams/list-with-cursor.json
@@ -1,3 +1,11 @@
 {
+  "_meta": {
+    "io.modelcontextprotocol/protocolVersion": "DRAFT-2026-v1",
+    "io.modelcontextprotocol/clientInfo": {
+      "name": "ExampleClient",
+      "version": "1.0.0"
+    },
+    "io.modelcontextprotocol/clientCapabilities": {}
+  },
   "cursor": "eyJwYWdlIjogMn0="
 }
diff --git a/schema/draft/examples/ReadResourceRequest/read-resource-request.json b/schema/draft/examples/ReadResourceRequest/read-resource-request.json
@@ -3,6 +3,14 @@
   "id": "read-resource-example",
   "method": "resources/read",
   "params": {
+    "_meta": {
+      "io.modelcontextprotocol/protocolVersion": "DRAFT-2026-v1",
+      "io.modelcontextprotocol/clientInfo": {
+        "name": "ExampleClient",
+        "version": "1.0.0"
+      },
+      "io.modelcontextprotocol/clientCapabilities": {}
+    },
     "uri": "file:///project/src/main.rs"
   }
 }
diff --git a/schema/draft/schema.json b/schema/draft/schema.json
diff --git a/schema/draft/schema.ts b/schema/draft/schema.ts
@@ -142,7 +142,7 @@ export interface TaskAugmentedRequestParams extends RequestParams {
  * @category Common Types
  */
 export interface RequestParams {
-  _meta?: RequestMetaObject;
+  _meta: RequestMetaObject;
 }
 
 /** @internal */
@@ -1215,12 +1215,6 @@ export interface SubscriptionFilter {
  * @category `subscriptions/listen`
  */
 export interface SubscriptionsListenRequestParams extends RequestParams {
-  /**
-   * `_meta` is required because `protocolVersion`, `clientInfo`, and
-   * `clientCapabilities` are required for every request. (Overrides the
-   * optional `_meta` from the base {@link RequestParams}.)
-   */
-  _meta: RequestMetaObject;
   /**
    * The notifications the client opts in to on this stream. The server
    * **MUST NOT** send notification types the client has not explicitly

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,11 @@`
`1`	`1`	`{`
	`2`	`+ "_meta": {`
	`3`	`+ "io.modelcontextprotocol/protocolVersion": "DRAFT-2026-v1",`
	`4`	`+ "io.modelcontextprotocol/clientInfo": {`
	`5`	`+ "name": "ExampleClient",`
	`6`	`+ "version": "1.0.0"`
	`7`	`+ },`
	`8`	`+ "io.modelcontextprotocol/clientCapabilities": {}`
	`9`	`+ },`
`2`	`10`	`"cursor": "eyJwYWdlIjogMn0="`
`3`	`11`	`}`