feat(mcp): spar-mcp crate skeleton + read-only tools (Track E commit 8 / v0.9.0)#179
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feat(mcp): spar-mcp crate skeleton + read-only tools (Track E commit 8 / v0.9.0)#179
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…8 / v0.9.0) New `spar-mcp` crate exposing spar's hypothetical-rebinding oracle as MCP (Model Context Protocol) tools so LLM agents can drive design-space exploration with spar as the deterministic correctness oracle. Three read-only / idempotent tools: - `spar.verify_move` — single hypothetical-rebinding check - `spar.enumerate_moves` — design-space exploration with multi-objective ranking - `spar.check_chain` — end-to-end latency breakdown for a chain Architecture: - `spar-cli` promoted to lib + bin so verify/enumerate logic is shareable - `spar-mcp` consumes the lib API in-process; no shell-out / re-parsing - stdio JSON-RPC transport (Initialize, tools/list, tools/call) - All tools `readOnlyHint: true` and `idempotentHint: true` per spec - Deterministic apply path stays CLI-exclusive (no `spar.apply_move` over MCP) Tests: 11 (5 in-process + 6 stdio). REQ-MCP-001 + TEST-MCP-* in artifacts/. Closes Track E commit 8/8 of the v0.8.0 migration design carved out as v0.9.0 scope per docs/designs/track-e-migration-research.md §6.5. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
spar-mcpcrate exposes spar's hypothetical-rebinding oracle as MCP (Model Context Protocol) tools so LLM agents can drive design-space exploration with spar as the deterministic correctness oracle.spar.verify_move,spar.enumerate_moves,spar.check_chain. All declarereadOnlyHint: true+idempotentHint: trueper the MCP 2025-11-25 spec.spar.apply_moveover MCP, ever) per Track E migration research §6.5 — certification chain stays in spar.Architecture
spar-clipromoted tolib + binso verify / enumerate / check-chain logic is shareable.spar-mcpconsumes the lib API in-process — no shell-out, no re-parsing of stdout.spar-mcpstandalone binary orspar mcp serve.Test plan
cargo test -p spar-mcp— 11/11 passcargo clippy --all-targets -- -D warnings— cleancargo fmt --all -- --check— cleanrivet validate— PASSclaude --mcp-config '{"mcpServers": {"spar": {"command": "spar-mcp", "args": []}}}'(post-merge smoke)🤖 Generated with Claude Code