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MCP registration fail on tool annotations #8503

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opened 2026-02-16 18:10:08 -05:00 by yindo · 1 comment
yindo commented 2026-02-16 18:10:08 -05:00
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Originally created by @Solido on GitHub (Feb 4, 2026).

Originally assigned to: @thdxr on GitHub.

Description

MCP specs support annotations. Branching an MCP server with annoted tools with silently fail. Good luck to find out ;)

https://modelcontextprotocol.io/specification/2025-11-25/schema#toolannotations

Plugins

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OpenCode version

Latest

Steps to reproduce

Put an annotation on a registered tool.
MCP status will put the server offline. No logs, no hint.

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Terminal

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Originally created by @Solido on GitHub (Feb 4, 2026). Originally assigned to: @thdxr on GitHub. ### Description MCP specs support annotations. Branching an MCP server with annoted tools with silently fail. Good luck to find out ;) https://modelcontextprotocol.io/specification/2025-11-25/schema#toolannotations ### Plugins _No response_ ### OpenCode version Latest ### Steps to reproduce Put an annotation on a registered tool. MCP status will put the server offline. No logs, no hint. ### Screenshot and/or share link _No response_ ### Operating System _No response_ ### Terminal _No response_
yindo added the bug label 2026-02-16 18:10:08 -05:00
yindo commented 2026-02-16 18:10:08 -05:00
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@github-actions[bot] commented on GitHub (Feb 4, 2026):

This issue might be a duplicate of existing issues. Please check:

  • #9425: Remote MCP type shows 'connected' but silently fails to register tools - describes a similar silent failure where MCP servers appear connected but tools don't get registered with no error messages

Feel free to ignore if this doesn't address your specific case.

@github-actions[bot] commented on GitHub (Feb 4, 2026): This issue might be a duplicate of existing issues. Please check: - #9425: Remote MCP type shows 'connected' but silently fails to register tools - describes a similar silent failure where MCP servers appear connected but tools don't get registered with no error messages Feel free to ignore if this doesn't address your specific case.
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Reference: anomalyco/opencode#8503
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