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Set readOnlyHint, idempotentHint, destructiveHint, and openWorldHint on the fetch tool registration, matching the spec in modelcontextprotocol#3572 and the pattern used by git and time reference servers. Document the annotations in the fetch README. Fixes modelcontextprotocol#3572
This was referenced Oct 10, 2026
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Thank you for this pull request. This repository now accepts issues, not pull requests, from anyone but its maintainers: design and implementation are done by the maintainers through a prompt-driven workflow, so outside PRs are closed rather than reviewed. The policy is in This change is tracked in #3572, which links back to this PR and credits you. It is being made in #5112 ( |
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Summary
ToolAnnotationsto the fetch server's singlefetchtool:readOnlyHint=true,idempotentHint=true,destructiveHint=false,openWorldHint=true.src/fetch/README.md, consistent with the filesystem server README.Fixes #3572
Motivation
The fetch reference server was the remaining unannotated server called out in #3572. Accurate annotations (especially
openWorldHint: true) help MCP clients gate outbound network access in multi-tool setups.Approach
Follows the same
ToolAnnotationspattern already used insrc/gitandsrc/time. Metadata-only change; no runtime behavior change.Test plan
cd src/fetch && uv run pytest -q(20 passed)cd src/fetch && uv run ruff check src tests