stacklit

Stacklit maps your codebase once and keeps the map fresh. It parses your repo with tree-sitter and writes stacklit.json: modules, exports, dependency edges and hints. Commit it, and your coding agent reads a few hundred tokens instead of crawling your files, then uses a few commands (query, slice, impact) to go straight to the right file. Free and MIT, no paid tier. One Go binary, local and deterministic, no LLM, and the CLI makes no network calls. (The map page can load language icons from thesvg.org; STACKLIT_MAP_ICONS=off removes that.)

Install

npx stacklit init                                   # scan, write the index, open the map
stacklit setup                                      # wire up the assistants it detects
git add stacklit.json && git commit -m "add stacklit index"

Also: brew install glincker/tap/stacklit, npm install -g stacklit, go install github.com/glincker/stacklit/cmd/stacklit@latest, or a binary from Releases.

See it

Output

stacklit derive prints a compact map for a prompt (gin v1.10.0, 137 tokens, module list trimmed here):

gin | go | 8 modules | 19,537 lines | Gin, GitHub Actions, net/http
test: go test ./... | env: PORT

modules:
  binding             binding | depends: bytesconv, json
  internal/bytesconv  bytesconv | depended-by: binding, render, root
  render              render | depends: bytesconv, json
  root                root package | depends: binding, bytesconv, json, render
do-not-touch: .github/

stacklit query returns a token-budgeted slice of the symbol graph (output trimmed here):

$ stacklit query "how is the symbol graph built" --budget 600
internal/cli/graphcmds.go
  50-63 func buildSymbolGraph(root string, includeTests ...bool) (*graph.SymGraph, error)
      calls BuildSymbols E0.95
internal/graph/resolve.go
  955-961 func BuildSymbols(root string, files []string, eo ExtractOptions) *SymGraph

What you get

Assistants

stacklit setup sets up 25 assistants, including Aider, Cline, Continue, OpenCode, Roo Code and Kiro, plus a generic AGENTS.md (stacklit setup --list shows all 26 targets). Anything else can read stacklit.json directly.

Languages

Stacklit indexes 48 languages and formats (full table). Symbol graph and call edges (query, slice, impact) cover 20 of them.

Symbol graph and call edges (20)

Index only (modules, exports and imports, no call edges)