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drunkcoding (@drunkcoding) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Function Dep Search by drunkcoding — Agent Skill

Name: Function Dep Search
Author: drunkcoding

Function Dep Search

AST-accurate function dependency analysis using Tree-sitter. Use when tracing function call chains, finding callers/callees, analyzing blast radius of changes, detecting unused functions, or finding circular dependencies. Replaces grep-based code exploration with precise, structural matching. Supports Python, JavaScript, TypeScript, Go, Rust, C, C++, Java. Triggers on questions like "what calls X?", "what does X call?", "find unused functions", "show me the call graph", "what's the impact of changing X?", or any function dependency/relationship query.

drunkcoding Updated Sep 21, 2026

File contents

Function Dependency Search

AST-based function dependency analysis via Tree-sitter. More precise and faster than grep for understanding function relationships in code.

Requirements

Python >= 3.10
tree-sitter >= 0.23

Quick Start

# Install dependencies (auto-installs per-language grammars)
python3 scripts/fdep.py --install defs <path>

# Or install manually
pip install tree-sitter tree-sitter-python tree-sitter-javascript

Commands

Command	Usage	Purpose
`defs`	`fdep.py defs <paths>`	List all function definitions
`calls`	`fdep.py calls <paths>`	Show call graph (caller -> callees)
`callees`	`fdep.py callees <func> <paths>`	What does `<func>` call?
`callers`	`fdep.py callers <func> <paths>`	What calls `<func>`?
`deps`	`fdep.py deps <func> <paths>`	Transitive dependencies (downstream)
`rdeps`	`fdep.py rdeps <func> <paths>`	Reverse transitive deps (upstream impact)
`unused`	`fdep.py unused <paths>`	Functions never called
`circular`	`fdep.py circular <paths>`	Circular dependency detection
`graph`	`fdep.py graph <paths>`	Full call graph

Output Formats

--json — Structured JSON (best for programmatic use)
--dot — Graphviz DOT (for graph, deps, rdeps)
Default — Human-readable text with file:line locations

Options

--depth N — Max transitive depth (default: 10)
--match-limit N — Max matches per query; warns if exceeded
--lang LANG — Force language instead of auto-detect from extension
--install — Auto-install missing tree-sitter packages
--version — Print fdep, tree-sitter, and Python version info

When to Use Which Command

Understanding a function: callees to see what it does, callers to see who uses it.

Change impact analysis: rdeps to find all upstream callers transitively — shows blast radius.

Refactoring safety: unused to find dead code. circular to find tangled dependencies.

Codebase overview: graph for full call graph. defs for function inventory.

Debugging a chain: deps to trace the full downstream call chain from an entry point.

Supported Languages

Auto-detected from file extensions. Use --lang to override.

Language	Extensions	Package
Python	.py, .pyi	tree-sitter-python
JavaScript	.js, .jsx, .mjs, .cjs	tree-sitter-javascript
TypeScript	.ts, .tsx	tree-sitter-typescript
Go	.go	tree-sitter-go
Rust	.rs	tree-sitter-rust
C	.c, .h	tree-sitter-c
C++	.cpp, .cc, .hpp, etc.	tree-sitter-cpp
Java	.java	tree-sitter-java

Extending Queries

See references/queries.md for per-language tree-sitter query patterns and instructions for adding new languages.

---name: function-dep-searchdescription: AST-accurate function dependency analysis using Tree-sitter. Use when tracing function call chains, finding callers/callees, analyzing blast radius of changes, detecting unused functions, or finding circular dependencies. Replaces grep-based code exploration with precise, structural matching. Supports Python, JavaScript, TypeScript, Go, Rust, C, C++, Java. Triggers on questions like "what calls X?", "what does X call?", "find unused functions", "show me the call graph", "what's the impact of changing X?", or any function dependency/relationship query.---# Function Dependency SearchAST-based function dependency analysis via Tree-sitter. More precise and faster than grep for understanding function relationships in code.## Requirements- Python >= 3.10- tree-sitter >= 0.23## Quick Start```bash# Install dependencies (auto-installs per-language grammars)python3 scripts/fdep.py --install defs <path># Or install manuallypip install tree-sitter tree-sitter-python tree-sitter-javascript```## Commands| Command | Usage | Purpose ||---------|-------|---------|| `defs` | `fdep.py defs <paths>` | List all function definitions || `calls` | `fdep.py calls <paths>` | Show call graph (caller -> callees) || `callees` | `fdep.py callees <func> <paths>` | What does `<func>` call? || `callers` | `fdep.py callers <func> <paths>` | What calls `<func>`? || `deps` | `fdep.py deps <func> <paths>` | Transitive dependencies (downstream) || `rdeps` | `fdep.py rdeps <func> <paths>` | Reverse transitive deps (upstream impact) || `unused` | `fdep.py unused <paths>` | Functions never called || `circular` | `fdep.py circular <paths>` | Circular dependency detection || `graph` | `fdep.py graph <paths>` | Full call graph |### Output Formats- `--json` — Structured JSON (best for programmatic use)- `--dot` — Graphviz DOT (for `graph`, `deps`, `rdeps`)- Default — Human-readable text with `file:line` locations### Options- `--depth N` — Max transitive depth (default: 10)- `--match-limit N` — Max matches per query; warns if exceeded- `--lang LANG` — Force language instead of auto-detect from extension- `--install` — Auto-install missing tree-sitter packages- `--version` — Print fdep, tree-sitter, and Python version info## When to Use Which Command**Understanding a function:** `callees` to see what it does, `callers` to see who uses it.**Change impact analysis:** `rdeps` to find all upstream callers transitively — shows blast radius.**Refactoring safety:** `unused` to find dead code. `circular` to find tangled dependencies.**Codebase overview:** `graph` for full call graph. `defs` for function inventory.**Debugging a chain:** `deps` to trace the full downstream call chain from an entry point.## Supported LanguagesAuto-detected from file extensions. Use `--lang` to override.| Language | Extensions | Package ||----------|-----------|---------|| Python | .py, .pyi | tree-sitter-python || JavaScript | .js, .jsx, .mjs, .cjs | tree-sitter-javascript || TypeScript | .ts, .tsx | tree-sitter-typescript || Go | .go | tree-sitter-go || Rust | .rs | tree-sitter-rust || C | .c, .h | tree-sitter-c || C++ | .cpp, .cc, .hpp, etc. | tree-sitter-cpp || Java | .java | tree-sitter-java |## Extending QueriesSee [references/queries.md](references/queries.md) for per-language tree-sitter query patterns and instructions for adding new languages.

Frequently asked questions