diff --git a/AGENTS.md b/AGENTS.md
index d4b09c8ce..64d264126 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -173,6 +173,6 @@ npx gitnexus serve                         # HTTP API on port 4747 (from any ind
 
 ### Gotchas
 
-- `npm install` in `gitnexus/` triggers `prepare` (builds via `tsc`) and `postinstall` (patches tree-sitter-swift, builds tree-sitter-proto). Native bindings need `python3`, `make`, `g++`.
-- `tree-sitter-kotlin` and `tree-sitter-swift` are optional — install warnings expected.
+- `npm install` in `gitnexus/` triggers `prepare` (builds via `tsc`) and `postinstall` (materializes the vendored grammars into `node_modules/`, then prefers a committed prebuild per platform-arch and only source-builds when none matches). A C/C++ toolchain (`python3`, `make`, `g++`) is needed only for that source-build fallback.
+- The vendored grammars `tree-sitter-{c,dart,proto,swift,kotlin}` are handled uniformly: c is required; dart/proto/swift/kotlin are optional and skippable via `GITNEXUS_SKIP_OPTIONAL_GRAMMARS=1`. Install warnings appear only when no prebuild matches the platform-arch and no toolchain is present, and are non-fatal — only that language's parsing is unavailable.
 - ESLint configured via `eslint.config.mjs` (TS, React Hooks, unused-imports). No `npm run lint` script; use `npx eslint .`. Prettier runs via lint-staged. CI checks both in `ci-quality.yml`.