OpenCodeHub

Code intelligence for AI coding agents, under Apache-2.0, on an all-OSS stack.

npm install -g @opencodehub/cli
cd /path/to/your/repo
codehub init && codehub analyze
# your agent now has impact, query, context, detect_changes, rename — 29 tools over MCP

Why this exists

AI coding agents have a structural blind spot: they can see a file, but they can't see the graph the file lives in. This causes three recurring failures that anyone who has shipped with a coding agent has lived through:

1. Missed dependencies. The agent renames a function and doesn't touch the 14 callers it can't see, because grep found 3.
2. Broken call chains. The agent changes a return shape, the handler two hops downstream explodes at runtime, and neither the agent nor its tests flag it — the relationship was never in context.
3. Blind edits. The agent edits a critical-path function without knowing it's on the hot path of 8 production flows, because nothing computed that ahead of time.

Grep is textual. Language servers are per-file. Embeddings are lossy. None of them answer the questions an agent actually needs answered before it writes a diff: what breaks if I change this? what depends on this? where does this data flow?

What OpenCodeHub solves

OpenCodeHub indexes your repository into a hybrid knowledge graph (structural + semantic) and exposes it to agents over the Model Context Protocol. Agents stop guessing and start asking:

impact(target: "validateUser")
→ direct callers: 14 · affected processes: 3 · risk: HIGH
→ fix direction: dependents (input validation boundary)

query("auth token refresh flow")
→ process: auth.refresh_token (7 steps, 4 files)
→ process: oauth.rotate_session (5 steps, 3 files)

context(name: "PaymentProcessor")
→ callers · callees · processes it participates in · ACCESSES edges · docstrings

The graph is precomputed at index time — clustering, execution-flow tracing, and blast-radius analysis are done once, not at every query. That means agents get complete relational context in one tool call, not ten round-trips.

flowchart LR
  A[Source tree] -->|tree-sitter parse| B[Symbol graph]
  B -->|resolve imports / MRO| C[Typed relations]
  C -->|BM25 + HNSW index| D[Hybrid graph store]
  C -->|detect communities + flows| E[Processes / clusters]
  D --> F[MCP server]
  E --> F
  F -->|29 tools| G[AI coding agent]

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Design choices worth knowing

Choice	Why it matters
Apache-2.0, end to end	Every runtime dep is OSI-approved permissive. No PolyForm, BSL, Commons Clause, Elastic v2, GPL, or AGPL. You can fork, embed, and ship commercial products on top without a license-review detour.
Local-first, offline-capable	codehub analyze --offline opens zero sockets. Your code never leaves your machine. No telemetry.
Deterministic indexing	Identical inputs produce a byte-identical graph hash. Reproducible. Auditable. Cacheable in CI.
MCP-native	Works out-of-the-box with Claude Code, Cursor, Codex, Windsurf, OpenCode. The MCP server is the primary interface; CLI exists for scripts and CI.
Embedded storage, graph-default	@ladybugdb/core graph engine for the structural store (default at v1) with DuckDB + hnsw_acorn (filter-aware HNSW via ACORN-1 + RaBitQ) + fts (BM25) for the temporal + retrieval views. Embedded files. No daemon. No database to operate. CODEHUB_STORE=duck reverts to the legacy single-file layout.
15 languages at GA	TypeScript, JavaScript, Python, Go, Rust, Java, C#, C, C++, Ruby, Kotlin, Swift, PHP, Dart, COBOL — tree-sitter for the first 14 plus a regex provider for fixed-format COBOL.
WASM-only parse runtime	web-tree-sitter WASM is the only parse runtime, on Node 20, 22, and 24. The 15 grammar .wasm blobs are vendored at packages/ingestion/vendor/wasms/. There is no native opt-in — npm install -g @opencodehub/cli@latest does zero native builds and zero GitHub fetches.

Quick start

Install from npm (recommended)

Requirements: Node 22 or 24.

# global install — puts `codehub` on your PATH
npm install -g @opencodehub/cli

# or run without installing
npx @opencodehub/cli --help

Bootstrap any repo and start querying:

cd /path/to/your/repo

# writes .mcp.json so Claude Code / Cursor launch `codehub mcp`,
# installs the Claude Code plugin, appends .codehub/ to .gitignore,
# seeds opencodehub.policy.yaml
codehub init

# index the repo (WASM parser, no native binaries needed)
codehub analyze

# your agent can now call impact, query, context, detect_changes, rename, …

Build from source

Requirements: Node 22 or 24; pnpm 10+; Python 3.12 (only needed for SCIP indexers on Python-heavy repos); mise recommended.

git clone https://github.com/theagenticguy/opencodehub
cd opencodehub
mise install
pnpm install --frozen-lockfile
pnpm run check          # lint + typecheck + test + banned-strings
mise run cli:link       # puts `codehub` on your PATH

MCP tool surface (29 tools)

Tool	Purpose
query	Process-grouped code intelligence — execution flows related to a concept
context	360-degree symbol view — callers, callees, processes, ACCESSES edges
impact	Blast radius — what breaks at depth 1/2/3 with confidence + risk tier
detect_changes	Git-diff impact — what do your current changes affect
rename	Multi-file coordinated rename with confidence-tagged edits
route_map / api_impact / shape_check / tool_map	HTTP route & MCP tool intelligence
group_query / group_status / group_contracts / group_cross_repo_links / group_sync / group_list	Cross-repo federation — fan out BM25, contracts, and staleness across a named group
list_repos · sql	Registry & escape-hatch SQL (read-only, timeout-guarded)
pack_codebase	Deterministic Repomix-compatible code pack export
…and the rest	verdict, risk_trends, project_profile, dependencies, license_audit, owners, list_findings, list_findings_delta, list_dead_code, remove_dead_code, scan

Architecture decision records live in docs/adr/. A Claude Code plugin at plugins/opencodehub/ wraps the MCP tools into skills + a code-analyst subagent — install via codehub init.

Repository layout

The monorepo is organised as 17 workspace packages under packages/:

Package	Purpose
analysis	Heuristic + SCIP call-graph resolution, community + flow detection
cli	codehub command — init, analyze, status, setup, scanners, group federation
cobol-proleap	ProLeap-backed deep-parse path for free-format COBOL (regex provider handles fixed-format)
core-types	Shared TypeScript types, Zod schemas, error codes, canonical LanguageId and node/edge kinds
embedder	Embedding backends — local ONNX, HTTP, SageMaker; deterministic embedderId fingerprint
frameworks	HTTP route + MCP tool detectors used by route_map / api_impact / tool_map
ingestion	Tree-sitter + WASM parsers, symbol extraction, import resolution, complexity phase
mcp	Model Context Protocol server — 29 tools, resources, structured error envelopes
pack	Deterministic Repomix-compatible code-pack generator (M5)
policy	Allowlist + license-tier policy engine driving license_audit and CI gates
sarif	SARIF schema validation and scanner output normalisation
scanners	Subprocess wrappers for 20 scanners — OSV, Semgrep, hadolint, tflint, detect-secrets, and the rest
scip-ingest	SCIP indexer runners (TS, Python, Go, Rust, Java) — emits CALLS, REFERENCES, IMPLEMENTS, TYPE_OF
search	Hybrid BM25 + HNSW (ACORN-1 + RaBitQ) query layer
storage	IGraphStore / ITemporalStore adapters — @ladybugdb/core (default) and DuckDB; deterministic graphHash
summarizer	Process + cluster summaries for MCP responses
wiki	LLM-narrated module pages emitted by codehub wiki --llm

The retrieval / graph-quality evaluation harness and the per-language F1 regression gym used to live here as eval and gym; they were extracted into a sibling testbed in M5 so the production package set ships free of test-time dependencies.

Embedding backends

OpenCodeHub ships with three embedding backends — all serve the same gte-modernbert-base 768-dim space, all use CLS pooling + L2 norm — and picks one at runtime based on environment variables:

Precedence	Env	Backend
1	CODEHUB_EMBEDDING_SAGEMAKER_ENDPOINT	SageMaker — invokes an AWS SageMaker Runtime endpoint (e.g. a TEI-served gte-modernbert-embed). Auth via the default AWS credential chain (profile, env vars, IMDS). No local weights needed.
2	CODEHUB_EMBEDDING_URL + CODEHUB_EMBEDDING_MODEL	HTTP (OpenAI-compatible) — POSTs to a /v1/embeddings server (Infinity, vLLM, TEI, Ollama, LM Studio, OpenAI). Bearer auth optional via CODEHUB_EMBEDDING_API_KEY.
3	(nothing set)	Local ONNX — deterministic, offline-safe. Requires codehub setup --embeddings to download the weights.

SageMaker-specific vars:

Var	Default	Purpose
CODEHUB_EMBEDDING_SAGEMAKER_ENDPOINT	(required to select)	Endpoint name (e.g. gte-modernbert-embed).
CODEHUB_EMBEDDING_SAGEMAKER_REGION	us-east-1	AWS region.
CODEHUB_EMBEDDING_DIMS	768	Expected vector dimension — asserted on every response to catch model-swap drift.
CODEHUB_EMBEDDING_MODEL	gte-modernbert-base/sagemaker:<endpoint-name>	Stable modelId stamp recorded in index metadata. Override only when bridging a non-gte endpoint.

IAM: the caller needs sagemaker:InvokeEndpoint on the endpoint ARN — e.g. arn:aws:sagemaker:us-east-1:<account>:endpoint/gte-modernbert-embed.

Do not mix backends against the same index. Backends are pinned to a single model identity via the modelId stamp in the embeddings table; switching mid-project requires codehub analyze --rebuild-embeddings. --offline refuses SageMaker and HTTP backends, so offline mode is compatible only with the local ONNX path.

Storage backend — graph-default

Starting with v1.0, OpenCodeHub picks the graph-database backend (@ladybugdb/core) as the default whenever the binding is importable on the current platform. DuckDB is retained as the temporal store (cochanges + symbol summaries) and as the legacy graph fallback. The CODEHUB_STORE environment variable controls selection:

CODEHUB_STORE	Behaviour
unset (default)	Probe @ladybugdb/core. Available → graph artifact at <repo>/.codehub/graph.lbug + temporal sibling temporal.duckdb. Missing → fall back to <repo>/.codehub/graph.duckdb (one-shot stderr advisory under TTY / OCH_VERBOSE=1).
duck	Force the legacy DuckDB-only layout. One file backs both the graph and temporal views.
lbug	Force the graph-database layout. Surface a GraphDbBindingError at open time if the binding is unavailable.

Two-artifact transition: when both graph.duckdb AND graph.lbug are present in the same <repo>/.codehub/, the newer-mtime file wins and a one-shot advisory fires. Remove the stale artifact to silence the advisory.

See docs/adr/0011-graph-db-backend.md for the M3 phase-1 rationale and docs/adr/0013-m7-default-flip-and-abstraction.md for the M7 default-flip + interface segregation.

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 native tree-sitter N-API addon and all 14 tree-sitter-<lang> npm packages are gone from the install graph. npm install -g @opencodehub/cli@latest does zero native builds and zero GitHub fetches.

All 15 grammar .wasm blobs are vendored at packages/ingestion/vendor/wasms/, built from the grammar sources pinned in package.json. Re-vendoring is a one-shot operation via bash scripts/build-vendor-wasms.sh (requires docker, podman, finch, or local emcc); consumers never build grammars at install time. The complexity phase (cyclomatic-complexity metrics) is also WASM-backed, so it runs on every install instead of degrading to a no-op.

See docs/adr/0015-wasm-only-parser-at-the-npm-distributed-boundary.md for the WASM-only rationale and the bulletproof-install plan; ADR 0013 records the prior WASM-default + native-opt-in posture and is now superseded.

Status

v1 — feature-complete on M1–M7. Tracks A (M7 graph-DB default + the IGraphStore / ITemporalStore interface segregation), B (20-scanner fleet incl. detect-secrets), C (debt sweep — embedder fingerprint, SCIP REFERENCES + TYPE_OF), and D (dogfood polish) have all merged. The current shipped tag remains 0.1.1; 1.0.0 is cut once schema + tool-surface stability is signed off.

While on 0.x, any release may contain breaking changes to the graph schema, MCP tool shapes, CLI flags, or storage layout. Breaking changes are called out with ! or a BREAKING CHANGE: footer in the commit log and summarised in each release's generated CHANGELOG.

Supply-chain posture

• CycloneDX SBOM at SBOM.cdx.json (regenerated on every release)
• Third-party license inventory at THIRD_PARTY_LICENSES.md
• CI gates: license allowlist, banned-strings grep, OSV vulnerability scan, CodeQL SAST, OpenSSF Scorecard
• Zero open CVEs on the lockfile at release time

Documentation

Architecture decision records live in docs/adr/ — the durable record of design tradeoffs (storage backend, SCIP adoption, hierarchical embeddings, CI toolchain pins, etc.).

A standalone user-guide + MCP reference site is being bootstrapped in a dedicated repo; this README will link it once published.

Contributing

See CONTRIBUTING.md. Issues and discussions welcome; PRs must pass pnpm run check and have a filled-out PR template.

License

Apache-2.0. See LICENSE and NOTICE.