feat(fetch): add tool annotations for fetch tool#4428
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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
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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