srcwalk

Agent's code navigator CLI — instantly outline, search, and trace call graphs across any language. One binary, one skill, zero config.

Tree-sitter outlines · symbol search · caller/callee graphs · blast-radius deps · token-aware maps

Small files come back whole, large files get a structural outline. Your agent reaches for srcwalk instead of cat and grep — cheap outlines first, drill on demand, never blow the token budget.

Originally forked from jahala/tilth, now developed independently.

What it does

• Read — outline if large, full if small, --section to drill into a symbol or line range
• Symbol search — tree-sitter definitions first, then usages, with resolved callees
• Callers — single-hop or multi-hop BFS (up to 5 hops), hub guard, collision warnings
• Callees — forward call graph, resolved + unresolved, with depth support
• Deps — blast-radius: imports and dependents of a file
• Map — token-annotated directory skeleton, respects .gitignore

15 languages: Rust, TypeScript, TSX, JavaScript, Python, Go, Java, Scala, C, C++, Ruby, PHP, C#, Swift, Elixir.

Install

# From source
cargo install --git https://github.com/sting8k/srcwalk --locked

# Pre-built (macOS Apple Silicon)
curl -L https://github.com/sting8k/srcwalk/releases/latest/download/srcwalk-aarch64-apple-darwin.tar.gz | tar xz -C /usr/local/bin

# npm
npx srcwalk

# macOS Intel
curl -L https://github.com/sting8k/srcwalk/releases/latest/download/srcwalk-x86_64-apple-darwin.tar.gz | tar xz -C /usr/local/bin

# Linux x86_64 (static musl)
curl -L https://github.com/sting8k/srcwalk/releases/latest/download/srcwalk-x86_64-unknown-linux-musl.tar.gz | tar xz -C ~/.local/bin

# Linux aarch64 (static musl)
curl -L https://github.com/sting8k/srcwalk/releases/latest/download/srcwalk-aarch64-unknown-linux-musl.tar.gz | tar xz -C ~/.local/bin

Windows: download srcwalk-x86_64-pc-windows-msvc.zip from the latest release.

Agent skill — teaches your coding agent the command vocabulary:

npx skills add sting8k/srcwalk

Full skill at skills/srcwalk/SKILL.md.

Quick examples

# Read a file (outline if large, full if small)
srcwalk src/auth.ts
srcwalk src/auth.ts --section handleAuth     # drill into symbol
srcwalk src/auth.ts --section 44-89          # line range

# Symbol search
srcwalk handleAuth --scope src/              # definitions + usages
srcwalk "foo, bar" --scope src/              # multi-symbol
srcwalk handleAuth --scope src/ --expand     # inline source + callees

# Callers (reverse call graph)
srcwalk handleAuth --callers --scope src/
srcwalk handleAuth --callers --depth 3 --scope src/   # BFS 3 hops
srcwalk handleAuth --callers --depth 3 --json         # machine-readable

# Callees (forward call graph)
srcwalk handleAuth --callees --scope src/
srcwalk handleAuth --callees --depth 2 --scope src/   # transitive

# Deps (blast radius)
srcwalk src/auth.ts --deps

# Map
srcwalk --map --scope src/

Multi-hop caller BFS

Trace callers transitively in one call:

$ srcwalk NewClient --callers --depth 3 --json
{
  "edges": [
    { "hop": 1, "from": "newDefaultClient", "from_file": "client/factory.go",
      "to": "NewClient", "call_text": "return NewClient(opts)" },
    { "hop": 2, "from": "Bootstrap", "from_file": "cmd/server/main.go",
      "to": "newDefaultClient", "call_text": "c, err := newDefaultClient(cfg)" },
    { "hop": 3, "from": "main", "from_file": "cmd/server/main.go",
      "to": "Bootstrap", "call_text": "if err := Bootstrap(ctx); err != nil {" }
  ],
  "stats": { "edges_per_hop": [4, 7, 3], "suspicious_hops": [] },
  "elided": { "auto_hubs_promoted": ["Error"], "edges_truncated": 0 }
}

call_text disambiguates overloads. suspicious_hops flags cross-package name collisions. auto_hubs_promoted shows fan-out-capped symbols.

Output examples

$ srcwalk src/auth.ts
# src/auth.ts (258 lines, ~3.4k tokens) [outline]

[1-12]   imports: express(2), jsonwebtoken, @/config
[14-22]  interface AuthConfig
[24-42]  fn validateToken(token: string): Claims | null
[44-89]  export fn handleAuth(req, res, next)
[91-258] export class AuthManager
  [99-130]  fn authenticate(credentials)
  [132-180] fn authorize(user, resource)

$ srcwalk handleAuth --scope src/ --expand
# Search: "handleAuth" in src/ — 6 matches (2 definitions, 4 usages)

## src/auth.ts:44-89 [definition]
  44 │ export function handleAuth(req, res, next) {
  45 │   const token = req.headers.authorization?.split(' ')[1];
  ...

── calls ──
  validateToken    src/auth.ts:24-42
  refreshSession   src/auth.ts:91-120

$ srcwalk searchSymbol --scope src/
no matches for "searchSymbol" in src/
> Did you mean: search_symbol (src/lib.rs:186)

$ srcwalk --map --scope .
src/       (~14.9k tokens)
  read/    (~10.2k tokens)
    outline/  (~3.7k tokens)
  search/  (~8.1k tokens)

Speed

Bloom-filter pruning + length-sorted memchr + tree-sitter parse cache.

Key features

• Multi-hop caller BFS (up to 5 hops, hub guard, collision detection)
• --callees flag — forward call graph as standalone query
• File-grouped usages with function annotations
• --section degradation — auto-outline when section too large
• Search ergonomics — cross-naming-convention Did-you-mean, bare-filename auto-pick, typo tolerance
• Budget cascade — --full over --budget degrades gracefully with explicit labels
• Leaner CLI — removed MCP server, edit mode, diff subcommand, --files dispatch
• Performance — mmap walkers, Aho-Corasick, rayon-parallel search, mimalloc
• Elixir support

License

MIT — originally forked from jahala/tilth.