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OpenCodeHub MCP Tools

This repository has been indexed by OpenCodeHub. When you are working in this codebase, prefer the following MCP tools over raw file search — they return graph-aware results grouped by execution flow and include blast-radius risk tiers.

  • list_repos — enumerate repos currently indexed on this machine.
  • query — hybrid BM25 + vector search over symbols, grouped by process.
  • context — inbound/outbound refs and participating flows for one symbol.
  • impact — dependents of a target up to a configurable depth, with a risk tier.
  • detect_changes — map an uncommitted or committed diff to affected symbols.
  • list_findings — browse SARIF findings from the latest scan by severity and rule.
  • sql — read-only SQL against the local temporal store (cochanges), 5 s timeout; the node/edge graph is queried via the typed tools or Cypher via the MCP sql tool.

Run codehub analyze after pulling new commits so the index stays aligned with the working tree. codehub status reports staleness.

Full MCP surface

The full MCP surface is 29 tools (see packages/mcp/src/server.ts); the 6 listed above are the high-frequency exploration tools. For the full inventory, use the /codehub-guide skill.

AMBIGUOUS_REPO

When two or more repos are indexed on this machine, per-repo tools require an explicit repo: (or the repo_uri: alias — a Sourcegraph-style URI such as github.com/org/repo, or local:<hash> for unpublished repos) and return AMBIGUOUS_REPO otherwise. The error envelope carries a structured _meta payload on structuredContent.error: { error_code: "AMBIGUOUS_REPO", jsonrpc_code: -32602, choices: [ { repo_uri, default_branch, group } ] (capped at 10), total_matches, hint } — so the calling agent can retry deterministically with a single repo_uri from choices. When total_matches > choices.length, the caller knows the list was truncated.

See ADR 0012 (docs/adr/0012-repo-as-first-class-node.md) for the rationale behind repo_uri as a first-class node attribute. The repo_uri shape was promoted to a typed graph attribute by AC-M6-1 (packages/core-types/src/nodes.ts:524-552). group_cross_repo_links (the AC-M6-3-reframed MCP tool) and the group_* family (AC-M6-4) all emit repo_uri in the same canonical form, so a caller can use any of those tools' repo_uri outputs as input to AMBIGUOUS_REPO.choices retries.

Worked example — error envelope, then retry:

// Error envelope returned by a per-repo tool when two repos are indexed
{
  "structuredContent": {
    "error": {
      "error_code": "AMBIGUOUS_REPO",
      "jsonrpc_code": -32602,
      "choices": [
        { "repo_uri": "github.com/org/api-svc", "default_branch": "main", "group": "platform" },
        { "repo_uri": "github.com/org/billing-svc", "default_branch": "main", "group": "platform" }
      ],
      "total_matches": 2,
      "hint": "Retry with repo_uri=<one of above>"
    }
  }
}
// Retry — pick the first choice deterministically
{ "tool": "context", "args": { "repo_uri": "github.com/org/api-svc", "symbol": "..." } }

Durable lessons

Prior-session architecture lessons live in .erpaval/INDEX.md (SCIP edge conventions, BM25 caveats, SageMaker embedder patterns). Read before making graph-index or retrieval changes.

Claude Code plugin

This repo ships a Claude Code plugin at plugins/opencodehub/ — it provides a code-analyst subagent and 11 skills. Install via codehub init (writes .mcp.json + links the plugin).

Storage backend — single-file SQLite (ADR 0019)

The entire index lives in ONE <repo>/.codehub/store.sqlite file (WAL), via Node's built-in node:sqlite — graph nodes, edges, embeddings, and the temporal tables (cochanges and the codehub query --sql escape hatch). One SqliteStore class implements both IGraphStore and ITemporalStore; openStore() returns that single instance as both the graph and temporal views, so call sites use store.graph.X() / store.temporal.Y() unchanged. Zero native storage bindings: @ladybugdb/core AND @duckdb/node-api are both removed (ADR 0019 supersedes ADR 0016). The write-only Parquet embeddings sidecar (BOM item #7) was dropped with DuckDB — nothing ever read it back; embeddings live in the embeddings table in store.sqlite. The code-pack is now an 8-item BOM. Zero native bindings, full stop: the embedder is onnxruntime-web (prebuilt WASM, in optionalDependencies, lazy under --embeddings) — there is no onnxruntime-node and nothing compiles at install. Parsing is WASM (web-tree-sitter) and the store is the built-in node:sqlite, so the entire install is pure JS + WASM.

Schema: one generic nodes table (typed base columns + payload JSON overflow for the 37 kind-specific shapes), one polymorphic edges table keyed by the (from,to,type,step) dedup tuple, an FTS5 virtual table for BM25 search, and recursive-CTE traversal for impact/blast-radius. The segregated IGraphStore / ITemporalStore interfaces still exist as the community-fork escape hatch (AGE / Memgraph / Neo4j / Neptune) — a fork implements both, on one class or split. Install is zero-native-dep: npm i -g @opencodehub/cli + Node ≥24.15, no Docker, no postinstall compile.

Parse runtime — WASM-only, vendored grammars

@opencodehub/ingestion runs web-tree-sitter (WASM) as the only parse runtime on Node 20, 22, and 24. There is no native opt-in — the legacy parser-runtime env var and CLI flag were removed in 0.4.0 (see ADR 0015 and the root + per-package CHANGELOGs). The CLI continues to emit a one-shot stderr advisory if a stale env var is set, then ignores it.

All 15 GA grammar .wasm blobs are vendored at packages/ingestion/vendor/wasms/, built from the grammar sources pinned in package.json. Rebuild via bash scripts/build-vendor-wasms.sh after bumping any of those grammars — requires docker, podman, finch (aliased as docker), or a local emcc install. Re-vendoring is a one-shot operation; consumers never build grammars at install time.

The complexity phase (packages/ingestion/src/pipeline/phases/complexity.ts) has been ported to web-tree-sitter, so cyclomatic-complexity metrics run on every install with no native dependency at runtime or test time. ADR 0013 (docs/adr/0013-parse-runtime-wasm-default.md) is superseded by ADR 0015 (docs/adr/0015-wasm-only-parser-at-the-npm-distributed-boundary.md).