Mathias 2148565ee6 feat(mcp): expose brain_graph tool — neighbors, subgraph, path ...

Commit 3 of Track A. The MCP server now publishes a new tool that
opens the brain knowledge graph (entities + wikilink edges) for
external consumers (claude.ai connectors, gitea-mcp, agentsquad).

- tools_graph.go: brain_graph handler dispatches by op:
    neighbors  — 1-hop outgoing from slug, optional edge_type filter
    subgraph   — every reachable slug within depth hops (≤6)
    path       — shortest directed path src→dst within depth (≤8)
  Returns slug + entity metadata + edge_type + hop distance.

- server.go: handleCall routes "brain_graph" to brainGraph.

- handlers.go: tool descriptor with the op enum + per-op required
  fields documented in the description.

- server_test.go: TestServerToolsList expects brain_graph in the
  listing.

The tool returns an error when BRAIN_GRAPH_ENABLED is unset — same
shape as brain_answer when the answer LLM is unconfigured.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-23 15:23:18 +02:00

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