Architecture

agb is a Node.js ESM codebase with no runtime dependencies in the installed plugin: every entry point is shipped as a self-contained bundle (see Build and bundle). It drives Google Antigravity's agy CLI as a subprocess and enforces the ADLC through the adlc toolkit and the adlc-antigravity companion plugin.

LayersCopy Anchor Link

The diagram groups modules by role and is drawn from their actual import statements at v1.0.0. Arrows point from a module to what it uses.

Entry pointsCopy Anchor Link

• bin/agb.mjs parses arguments against a static COMMANDS table and dispatches to the library (bin/agb.mjs). Every subcommand is documented in the CLI reference.
• mcp/server.mjs is a stdio JSON-RPC server. It imports no lib/ code; each tool call spawns the agb CLI, resolving dist/agb.mjs next to itself when bundled and bin/agb.mjs in a source checkout (mcp/server.mjs). See MCP tools.
• hooks/pre-tool-use.mjs is the in-session guard agy calls before every tool use. It depends only on hooks/policy/* and lib/active-rails.mjs. See Policy guard.
• sidecars/ is the optional local dashboard. It imports no lib/ code and reads run state from disk. See Sidecar dashboard.

Plan compilerCopy Anchor Link

lib/plan.mjs compiles an Antigravity brain plan (read by lib/brain.mjs) or a spec file into a validated, gated plan.json. lib/preflight.mjs supplies the deterministic scope-overlap forecast and the coldstart model gate. See Plan compiler.

Orchestration engineCopy Anchor Link

lib/scheduler.mjs (runPlan) runs the ticket DAG. It routes each ticket through the quota pools (lib/pools.mjs, class PoolSet), creates worktrees and runs integration transactions (lib/worktrees.mjs), runs sandboxed gates (lib/gates.mjs), prosecutes with a different model family (lib/prosecute.mjs, prompts from lib/charters.mjs), serializes runs per repository (lib/lock.mjs), writes .booster/run.json (lib/status.mjs) and checks that workers did not tamper with anything outside their worktree (lib/run-integrity.mjs) (lib/scheduler.mjs). See Run lifecycle and Integration journal.

lib/lock.mjs and lib/gates.mjs are this repository's own frozen rails: merge-lock correctness and sandbox enforcement.

ADLC bridgeCopy Anchor Link

lib/adlc-bridge.mjs is the only place agb talks to the ADLC toolkit. It resolves and authenticates the adlc binary (the pinned vendored copy when bundled), projects plans into the ticket store, and reads the companion plugin's contract. Calls to adlc tools return { ok: false, error } instead of throwing: audit gates such as gate-manifest degrade, while enforcement gates such as rails-guard are failed closed by their callers. lib/active-rails.mjs is the fail-closed reader of active rails, shared by the scheduler and the policy guard (lib/active-rails.mjs).

Installation and healthCopy Anchor Link

lib/bootstrap.mjs (agb bootstrap), lib/doctor.mjs (agb doctor), lib/plugin-paths.mjs (plugin root, safe agy plugin install, vendored tarball, terminal shim) and lib/migrate.mjs with lib/migration-lock.mjs (agb migrate). See Plugin and migration.

The agy boundaryCopy Anchor Link

lib/agy.mjs is the only module that spawns agy. It isolates runs with --project, parses stream-json output under hard-coded size caps, and enforces timeouts. Builders, prosecutors, plan conversion and quota telemetry all go through it. See agy integration.

Where state livesCopy Anchor Link

The full list is in File layout. Every exported symbol, module by module, is in the generated Module map.