shrink-mcp-tool-docs

Shrink LLM-facing MCP tool descriptions — @mcp.tool docstrings and Field(description=...) — to eval-failure boundary via compress→eval→compress loop with snapshot+rollback, all gates green. Use when asked shrink/compress/optimize/token-diet tool descriptions, docstrings, or param descriptions. NOT for ordinary code comments (use compress-code-comments). Triggers on /shrink-mcp-tool-docs.