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fix(mcp): tolerate invalid output schema patterns - #35662

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fengjikui wants to merge 1 commit into
anomalyco:devfrom
fengjikui:codex/mcp-tolerate-pattern
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fengjikui wants to merge 1 commit into
anomalyco:devfrom
fengjikui:codex/mcp-tolerate-pattern

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@fengjikui

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Issue for this PR

Closes #35624

Type of change

  • Bug fix
  • New feature
  • Refactor / code improvement
  • Documentation

What does this PR do?

client.listTools() can throw while the MCP SDK precompiles outputSchema validators when a tool declares a non-ECMAScript pattern, for example a Python-style named group. McpCatalog.defs() then treats discovery as failed and hides the server tools.

This change classifies that SDK Invalid regular expression failure as one of the output-schema validation cases that already fall back to a raw tools/list request with outputSchema omitted, so the catalog still exposes the tool list.

The regression test keeps normal output-schema validation coverage intact and proves this fallback for a malformed output schema pattern. I intentionally kept the code scoped to the observed SDK failure path instead of changing input schema handling.

How did you verify your code works?

  • cd packages/opencode && bun test test/mcp/catalog.test.ts
  • cd packages/opencode && bun test test/mcp/oauth-auto-connect.test.ts
  • cd packages/opencode && bun typecheck
  • git diff --check
  • pre-push hook: bun turbo typecheck (30 tasks)

Screenshots / recordings

N/A, MCP catalog behavior change.

Checklist

  • I have tested my changes locally
  • I have not included unrelated changes in this PR

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github-actions Bot commented Aug 7, 2026

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Automated PR Cleanup

Thank you for contributing to opencode.

Due to the high volume of PRs from users and AI agents, we periodically close older PRs using automated criteria so maintainers can focus review time on the most active and community-supported contributions.

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Successfully merging this pull request may close these issues.

MCP: a tool with a non-ECMAScript JSON-Schema pattern fails the whole server connection (shown as "Authentication failed" for OAuth servers)

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