feat(memctl): MCP (stdio) server surface for LLM hosts (closes #42) - #62
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`memctl mcp` runs a Model Context Protocol server over stdio so LLM hosts (Claude Desktop / Cursor) can call memsidecar's memory as tools — the Letta-style "assistant manages its own long-term memory" pattern. It's pure protocol translation over the existing gRPC services (same shape as the HTTP gateway): every tool proxies under a single capability token, so the capability check and policy engine run server-side unchanged. The LLM's judgement stays client-side; the sidecar still just does CRUD. This is a secondary surface — code that runs alongside an agent should use the SDKs/gRPC. - Uses the official github.com/modelcontextprotocol/go-sdk v1.6.1. - Curated tools: kv_get/put, semantic_search/upsert, episodic_append/range, graph_neighbors/traverse. Binary artifacts are intentionally omitted (blobs don't fit the LLM-tool model); streaming tail is surfaced as bounded range. - Reads --addr/$MEMSIDECAR_ADDR + --token/$MEMSIDECAR_TOKEN; forwards the token on a client interceptor. Self-contained dial helpers (mcp-prefixed) so the file stands alone. - Docs: website/docs/clients/mcp.md (with a Claude Desktop config example) + sidebar entry. Verified end-to-end: an MCP client spawned `memctl mcp` and every tool round-tripped through gRPC (kv put/get, semantic upsert/search, episodic append/range) with a real NotFound propagated as a tool error. go build/vet, go test -race, golangci-lint all clean. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Adds an MCP (Model Context Protocol) stdio server surface to
memctlso LLM hosts (Claude Desktop, IDEs, etc.) can use a MemorySidecar instance as a memory backend. Closes #42.cmd/memctl/mcp.go— an MCP stdio server exposing the data-plane operations (via the existingdataplaneclient) as MCP tools; wired intomemctlinmain.go.website/docs/clients/mcp.md+ quickstart/sidebar entries.Notes
This branch existed locally, based ~8 commits behind
main; I cherry-picked the single feature commit onto currentmain(clean, no conflicts) so the PR is purely additive — 6 files, +449, no reverts of intervening work.Verification (the CI gates, run locally under podman go 1.26)
go vet ./...cleango test -race -count=1 ./...greengolangci-lint run(v2.12.2) — 0 issuesbufis unaffected