kartograf AGENTS.md

AGENTS.md

Guidance for AI agents working in this repository.

What this is

kartograf builds a code map (symbols, references, call graph) of a project into SQLite and serves it to AI agents over MCP (stdio). Tree-sitter parsing, language-agnostic core, PHP/Go/TS adapters, an optional type-inference enrichment layer (go/types, PHPStan).

Build & test

cgo is required (tree-sitter, mattn/go-sqlite3) and so is the sqlite_fts5 build tag — a compile guard (internal/core/store/fts5guard.go) fails the build without it. Always go through the Makefile:

make check      # vet + test + fmt + build — run before every commit
make install    # go install into $GOPATH/bin (MCP configs point there)

Plain go build ./... will fail with BUILD_WITH_TAG_sqlite_fts5... — that is intentional, add -tags sqlite_fts5 or use make.

Layout

• cmd/kartograf — CLI (cobra): index, serve, enrich, outline, hidden parse-tree.
• internal/core/model — language-neutral types (Symbol, Ref, Import, FileIndex). Nothing language-specific belongs here.
• internal/core/lang — adapter contract + registry.
• internal/core/indexer — walk (gitignore-aware), worker pool, mtime/sha256 change detection, go.mod module map collection.
• internal/core/store — SQLite schema, bulk/incremental writers, FTS5, enrichment table.
• internal/core/query — read side used by MCP tools.
• internal/lang/php, internal/lang/golang, internal/lang/ts — tree-sitter adapters.
• internal/enrich — go/types pass and PHPStan rule scaffolding + JSONL import.
• internal/mcpserver — MCP tool definitions.

Hard-won rules (do not relearn these the hard way)

• Schema changes: any change to the SQLite schema requires bumping schemaVersion in internal/core/store/store.go. A mismatch silently deletes and rebuilds the database — that is the designed migration strategy; never write ALTER migrations.
• FQN dialects: PHP App\Ns\Class::method(), Go module/pkg.Type.Method(), TS path/module#Class.method() (module = extensionless file path, trailing /index stripped). Symbol IDs prefix the language (php:..., go:..., ts:...). Query helpers (methodSplit, memberSep, suffix lookup) must stay separator-agnostic across all dialects.
• tree-sitter node kinds: never trust documentation or memory — dump the real CST with kartograf parse-tree file.{php,go} (hidden command) and verify. Grammar quirks live in the adapter tests' testdata/ fixtures; extend those fixtures when touching extraction.
• MCP output schemas: Claude Code rejects tools whose outputSchema is not a JSON object — wrap list results in a struct ({results: [...]}), never return a bare slice as the Out type.
• PHPStan enrichment: the rule class is loaded via --autoload-file (bootstrapFiles is too late for DI container construction). Edges travel as pseudo-errors with identifier kartograf.edge through --error-format=json — do NOT switch to a side-channel output file: PHPStan's result cache skips unchanged files and would silently drop their edges.
• Enrichment lifecycle: .kartograf/enrich.<source>.jsonl is the source of truth — at the root and in every nested project directory (enrich.Discover walks the tree past .git/vendor/dot-dirs/excludes). ext_edges are keyed by origin (root-relative path of the exchange file) and replaced wholesale per origin on import, auto-imported by index/serve on mtime change, and dropped when the file is deleted. Tool-reported paths resolve inside the owning project first (Exchange.Prefix), then root-relative, then by longest suffix.
• TS specifics: JSX component renders are calls edges with a () target so they join function-component FQNs; unqualified names resolve only through imports or file-local declarations (JS scoping — unknown names are globals and are skipped); imports through barrel files (index.ts re-exports) stay heuristic and do not join the graph — a known limitation.
• Vendor code is indexed shallow (SkipRefs): declarations and hierarchy only. Don't emit call edges from vendor files.
• Bulk vs incremental writes: an empty database takes BeginBulkWrite (indexes/triggers dropped, FTS rebuilt once at commit). Incremental runs rely on the FTS triggers; keep both paths working when touching the store.