feat: MCP server over the pattern catalog - #10
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src/design_patterns_mcp/: MCPServer (mcp 2.x SDK) exposing - tools: list_patterns, get_pattern, search_patterns, run_example (sandboxed), recommend_pattern (caveats + prefer-alternative notes) - resources: catalog://index, pattern://<group>/<slug>[/<variant>] - prompts: refactor_toward, explain_pattern, choose_pattern search.py: pure-stdlib BM25 over frontmatter+prose with field weights. sandbox.py: catalog-resolved paths only, python -I subprocess, scrubbed env, temp cwd, 10s timeout, 64KB output caps. Console script python-design-patterns-mcp (stdio default, --http for Streamable HTTP). docs/mcp.md documents connection and the sandbox contract. 228 tests incl. in-memory MCP client integration and sandbox refusal tests; both transports probed live with initialize round-trips. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Phase 10.
uv run python-design-patterns-mcpserves the catalog over MCP.Tools —
list_patterns·get_pattern(prose + source) ·search_patterns(pure-stdlib BM25) ·run_example(sandboxed subprocess, real stdout) ·recommend_pattern(caveats attached;prefer-alternativeverdicts point at the pythonic alternative)Resources —
catalog://index,pattern://<group>/<slug>,pattern://<group>/<slug>/<variant>Prompts —
refactor_toward,explain_pattern,choose_patternSandbox contract: only catalog-resolved files run —
(id, variant)is a dict lookup, never a path join;python -I, scrubbed env, temp cwd, 10s timeout, 64KB caps. Traversal-shaped ids/variants are refused (tested).Verified: 228 tests (incl. in-memory MCP
Clientintegration); stdio and Streamable HTTP both answeredinitializeround-trips live. Dep:mcp(2.x SDK). Console script wired inpyproject.toml;docs/mcp.mdhasclaude mcp addconfig.🤖 Generated with Claude Code