A code knowledge graph built for agents
rgBuilder indexes your repository once, then answers reachability and structure questions in compact JSON — so coding agents use fewer tokens and make fewer confident mistakes.
What sets it apart
Most code graphs stop at symbols, callers, and impact. rgBuilder adds precomputed reachability, hybrid CPG depth, centrality, communities, and migration/CI outputs — always as deterministic -f json for agents.
Index & ask
Agent-ready facts without dumping trees into context.
discover
One Rust indexing pass builds the graph plus reachability caches. Later questions are lookups — not greps.
gql
Exact inventory and typed edges with macros (all_functions, communities). Stable -f json with schema_version.
semantic
Opt-in intent search ("checkout flow") over functions or communities — offline hash/vocab or ONNX, not a substitute for structure.
Program analysis
Beyond call lists — CFG, PDG, flows, and security paths.
blast-radius
Deterministic upstream impact for a symbol at any depth — compact JSON agents can gate edits on.
cpg · slice · inspect
Hybrid CALL + CFG/PDG façade: statement slices, field mutations, dominance — Joern-class depth without leaving the CLI.
taint · security
Source→sink and CVE-oriented paths when you discover with --with-taint / --with-security — not just “who calls whom.”
Architecture & change
Where complexity concentrates — and what to migrate first.
communities
Label-propagation clusters so agents reason about subsystems, not a flat bag of functions.
metrics
PageRank, betweenness, harmonic centrality, and hotspots — ranked facts, not LLM guesses about importance.
migration · check
Export a prioritized migration_plan.json; enforce blast-radius policy in CI with check --policy-file.
See it run
The same path as the first hour of the user guide, on the ecommerce-java fixture.
From prompt → graph facts → edit
Drop AGENTS.md into your agent workflow. The model calls rgBuilder instead of grepping blindly — then reasons on structured impact.
Agent guide$ rg-build discover .$ rg-build -f json semantic query "checkout flow" --limit 5$ rg-build -f json blast-radius "priceShoppingCart" --depth 2