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fix: correct MISSING_REQUIRED_CLIENT_CAPABILITY error code to -32021 (#10)

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Rich Smith 2026-08-19 22:30:36 -04:00 • committed by GitHub
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seps/2663-tasks-extension.md
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@ -86,7 +86,7 @@ A server that has negotiated this extension **MAY** return `CreateTaskResult` in
A server **MUST NOT** return `CreateTaskResult` to a client that did not include the extension capability on its request, regardless of prior declarations. A client that has negotiated this extension **MUST** be prepared to handle either `CallToolResult` or `CreateTaskResult` in response to any supported request it issues. A client that receives `CreateTaskResult` in response to an unsupported request type **MUST** interpret this as an invalid response to the request. A server **MUST NOT** return `CreateTaskResult` to a client that did not include the extension capability on its request, regardless of prior declarations. A client that has negotiated this extension **MUST** be prepared to handle either `CallToolResult` or `CreateTaskResult` in response to any supported request it issues. A client that receives `CreateTaskResult` in response to an unsupported request type **MUST** interpret this as an invalid response to the request.
If a server is unable to service a request to a client that does not declare this extension capability without returning `CreateTaskResult`, the server **MUST** return an error with the code `-32003` (Missing Required Client Capability), indicating the required extension in the error response: If a server is unable to service a request to a client that does not declare this extension capability without returning `CreateTaskResult`, the server **MUST** return an error with the code `-32021` (Missing Required Client Capability), indicating the required extension in the error response:
```jsonl ```jsonl
{ {
@ -94,7 +94,7 @@ If a server is unable to service a request to a client that does not declare thi
"id": 1, "id": 1,
"error": { "error": {
// MISSING_REQUIRED_CLIENT_CAPABILITY // MISSING_REQUIRED_CLIENT_CAPABILITY
"code": -32003, "code": -32021,
// Message provided for example purposes only. The content of this example message is non-normative. // Message provided for example purposes only. The content of this example message is non-normative.
"message": "Missing required client capability", "message": "Missing required client capability",
"data": { "data": {
@ -468,7 +468,7 @@ If a client requests task status notifications but does not declare the `io.mode
"id": 12, "id": 12,
"error": { "error": {
// MISSING_REQUIRED_CLIENT_CAPABILITY // MISSING_REQUIRED_CLIENT_CAPABILITY
"code": -32003, "code": -32021,
// Message provided for example purposes only. The content of this example message is non-normative. // Message provided for example purposes only. The content of this example message is non-normative.
"message": "Missing required client capability", "message": "Missing required client capability",
"data": { "data": {
@ -798,7 +798,7 @@ Servers **MUST** return standard JSON-RPC errors for the following protocol erro
- Servers **MUST** return this error for `tasks/get`. - Servers **MUST** return this error for `tasks/get`.
- Servers **SHOULD** return this error for `tasks/update` and `tasks/cancel`. - Servers **SHOULD** return this error for `tasks/update` and `tasks/cancel`.
- Internal errors: `-32603` (Internal error) - Internal errors: `-32603` (Internal error)
- Missing required client capabilities: `-32003` (Missing Required Client Capability) - Missing required client capabilities: `-32021` (Missing Required Client Capability)
- Servers **MUST** return this error for non-declaring clients requesting task notifications on `subscriptions/listen`. - Servers **MUST** return this error for non-declaring clients requesting task notifications on `subscriptions/listen`.
- Servers **MUST** return this error for non-declaring clients issuing `tasks/get`, `tasks/update`, and `tasks/cancel` requests. - Servers **MUST** return this error for non-declaring clients issuing `tasks/get`, `tasks/update`, and `tasks/cancel` requests.