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

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SEP-2164: Standardize resource not found error code (-32602) - #2164

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May 18, 2026
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SEP-2164: Standardize resource not found error code (-32602)#2164
mcp-commander[bot] merged 9 commits into
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sep/resource-not-found-error

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pja-ant commented Jan 28, 2026

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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.

pja-ant force-pushed the sep/resource-not-found-error branch from 5faa2ee to 348d8e7 Compare January 28, 2026 17:42
pja-ant force-pushed the sep/resource-not-found-error branch from 348d8e7 to 310784e Compare January 28, 2026 17:45
pja-ant changed the title SEP: Standardize resource not found error code (-32602) SEP-2164: Standardize resource not found error code (-32602) Jan 28, 2026
pja-ant marked this pull request as ready for review January 28, 2026 17:48
pja-ant requested a review from a team as a code owner January 28, 2026 17:48

maxisbey commented Jan 28, 2026

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related: modelcontextprotocol/python-sdk#1821

maxisbey mentioned this pull request Jan 28, 2026
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localden added proposal SEP proposal without a sponsor. SEP labels Jan 29, 2026
localden moved this to Draft in SEP Review Pipeline Jan 29, 2026

jonathanhefner commented Jan 30, 2026

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Previous discussion (for reference): #1545.

pja-ant commented Jan 30, 2026

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Previous discussion (for reference): #1545.

yeah I remember this, but didn't realize it was already so inconsistent. Any client has to handle various values anyway to work with real servers out there, so we might as well just trying and get all servers to converge.

jonathanhefner mentioned this pull request Feb 5, 2026
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pja-ant force-pushed the sep/resource-not-found-error branch from da439aa to 8e938f2 Compare February 9, 2026 15:00
pja-ant added in-review SEP proposal ready for review. and removed proposal SEP proposal without a sponsor. labels Feb 25, 2026
pja-ant self-assigned this Feb 25, 2026
localden mentioned this pull request Mar 11, 2026
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3 of 9 tasks

sep-automation-bot Bot commented Mar 16, 2026

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Maintainer Activity Check

Hi @pja-ant!

You're assigned to this SEP but there hasn't been any activity from you in 18 days.

Please provide an update on:

  • Current status of your review/work
  • Any blockers or concerns
  • Expected timeline for next steps

If you're no longer able to sponsor this SEP, please let us know so we can find another maintainer.

This is an automated message from the SEP lifecycle bot.

pja-ant force-pushed the sep/resource-not-found-error branch from 0125e6c to a2ef384 Compare March 17, 2026 13:47
pja-ant requested a review from a team as a code owner March 17, 2026 13:47
pja-ant force-pushed the sep/resource-not-found-error branch from a2ef384 to 9d8520d Compare March 18, 2026 10:34
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Reviewers

pcarleton pcarleton left review comments
mcp-commander[bot] mcp-commander[bot] approved these changes
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halter73 halter73 left review comments
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pja-ant

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final SEP finalized. SEP

Projects

2026-07-28 Spec Implementation
Status: Done
SEP Review Pipeline
Status: Final

Milestone

2026-07-28-RC

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