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mcp: align resource not found error code with sep-2164 (#931)

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Change the error code returned by ResourceNotFoundError from -32002 to
-32602 (jsonrpc.CodeInvalidParams), aligning with
[SEP-2164](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2164).

* Not gated with a protocol version check, because the previous error
code was never formally specified and the behaviour varied across SDKs.
* In case clients which rely on the old error code exist, the previous
behaviour can be restored with `MCPGODEBUG=customresnotfounderrcode=1`.
* `CodeResourceNotFound` deprecated since its only purpose going forward
is backward compatibility. The new code should use
`jsonrpc.CodeInvalidParams` directly.
* `CodeResourceNotFound` changed to `var` so it can stay in sync with
`ResourceNotFoundError` and existing code doing `code ==
mcp.CodeResourceNotFound` keeps working in both the default and compat
modes.
This commit is contained in:
Yaroslav 2026-05-05 16:20:02 +02:00 • committed by GitHub
commit 2b7c9937e6
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9
docs/mcpgodebug.md
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@ -18,6 +18,15 @@
## `MCPGODEBUG` history
### 1.7.0
Options listed below were added and will be removed in the 1.9.0 version of the SDK.
- `customresnotfounderrcode` added. If set to `1`, `ResourceNotFoundError` will
use the custom error code `-32002` instead of the standard `-32602` (Invalid
Params), restoring the previous behavior. The default behavior was changed to
align with SEP-2164 and the JSON-RPC specification.
### 1.6.0
Options listed below were added and will be removed in the 1.8.0 version of the SDK.