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Title: SEP-2164: Standardize resource not found error code (-32602) by pja-ant · Pull Request #2164 · modelcontextprotocol/modelcontextprotocol · GitHub

Open Graph Title: SEP-2164: Standardize resource not found error code (-32602) by pja-ant · Pull Request #2164 · modelcontextprotocol/modelcontextprotocol

X Title: SEP-2164: Standardize resource not found error code (-32602) by pja-ant · Pull Request #2164 · modelcontextprotocol/modelcontextprotocol

Description: Specification and documentation for the Model Context Protocol - SEP-2164: Standardize resource not found error code (-32602) by pja-ant · Pull Request #2164 · modelcontextprotocol/modelcontextprotocol

Open Graph Description: This SEP standardizes the error code for resource not found from -32002 to -32602 (Invalid Params), aligning with the JSON-RPC specification. Includes the draft spec change.

X Description: This SEP standardizes the error code for resource not found from -32002 to -32602 (Invalid Params), aligning with the JSON-RPC specification. Includes the draft spec change.

Opengraph URL: https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2164

X: @github

direct link

Domain: github.com

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og:image:altThis SEP standardizes the error code for resource not found from -32002 to -32602 (Invalid Params), aligning with the JSON-RPC specification. Includes the draft spec change.
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[2026-07-28] Schema modernization & error code standardization modelcontextprotocol/php-sdk#337 https://github.com/modelcontextprotocol/php-sdk/issues/337
[Schema] SEP-2164: Switch resource-not-found error code to -32602 with protocol-version-aware fallback modelcontextprotocol/php-sdk#359 https://github.com/modelcontextprotocol/php-sdk/issues/359
fix(router): use -32602 for resource not found per SEP-2164 joshrotenberg/tower-mcp#819 https://github.com/joshrotenberg/tower-mcp/issues/819
fix(types): reconcile McpErrorCode against SEP-2575 + spec-current code assignments joshrotenberg/tower-mcp#832 https://github.com/joshrotenberg/tower-mcp/issues/832
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May 29, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2164#ref-issue-4547539361
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Jun 2, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2164#ref-issue-4572993472
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Implement SEP-2164: Standardize resource not found error code (-32602) modelcontextprotocol/go-sdk#992 https://github.com/modelcontextprotocol/go-sdk/issues/992
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feat: standardize resource-not-found error code (SEP-2164) modelcontextprotocol/rust-sdk#899 https://github.com/modelcontextprotocol/rust-sdk/pull/899
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Jun 13, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2164#ref-pullrequest-4656095132
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