graphlint

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Dead code detection for AI-generated codebases.

AI agents generate code rapidly, leaving behind dead and redundant code that pollutes the LLM's context window and dilutes attention. Graphlint analyzes your codebase's dependency graph to identify entry points and detect dead code — components unreachable from any entry point — so agents can self-clean and keep the codebase lean.

Supported Languages

Install optional language support:

pip install graphlint[rust]    # adds tree-sitter and tree-sitter-rust
pip install graphlint[csharp]  # adds tree-sitter and tree-sitter-c-sharp

Features

• Dead code detection — finds components unreachable from any entry point via graph traversal
• Multi-language support — Python, Rust, and C# backends via a language adapter abstraction; Python uses stdlib ast, Rust and C# use tree-sitter
• Language-specific awareness — Python decorators, Rust attribute macros (#[tokio::main], #[test]), C# attributes ([Fact], [HttpGet]), trait implementations, pub/public visibility, partial classes, and more
• AST/CST parsing — extracts functions, methods, structs, enums, traits, impls, macros, classes, properties, indexers, events, variables, and fields; aware of type annotations, unpacked variables, and generics
• Dependency graph — builds directed edges: read, write, call, inherit, decorate
• Entry point detection — 28 built-in rules covering Python frameworks (FastAPI, Flask, Django, Click, Typer, Celery, pytest), Rust conventions (main, async runtimes, WASM, proc macros, FFI, tests, pub API), and .NET conventions (console, xUnit, NUnit, MSTest, Web API, Minimal API, Generic Host, WinForms, WPF) plus custom rules
• Configurable entry templates — add custom entry rules via ast_pattern prefixes including function_call:, function_def:, decorator:, class_definition: (C#), file_match:, file_is_program (C#), visibility:pub (Rust), visibility:public (C#), trait_impl: (Rust), macro_def: (Rust), and more
• --public-as-entry flag — treat all public items (Rust pub, C# public) as entry points for library analysis
• Warning detection — 11 warning types including circular references, unused imports, write-only variables, and more
• Incremental updates — after initial full scan, only changed files are re-indexed; delta-aware reachability analysis avoids full-graph recomputation; incompatible index schema versions are auto-detected and rebuilt
• Python API + CLI — integrate into any Tool, CI pipeline, or let agents self-analyze and self-clean

Installation

pip install graphlint

Requirements: Python >= 3.9

For Rust support (.rs files), install the optional tree-sitter dependencies:

pip install graphlint[rust]

For C# support (.cs files), install the optional tree-sitter dependencies:

pip install graphlint[csharp]

Quick Start

Agent Integration

Graphlint provides a command to inject its usage prompt into your AI coding tools at the global level, so every project automatically has graphlint's guidance:

# Install graphlint prompt into agent tools (opencode, cursor, codex, cc)
graphlint install

# Copy the prompt to clipboard for manual paste into your agent
graphlint prompt

# Remove graphlint prompt from agent tools
graphlint uninstall

Run graphlint install and select the tools you use — the prompt (usage scenarios, essential commands, and parameters) will be added to their global configuration. For details, see Agent Integration.

If your agent tool is not listed in install, run graphlint prompt to copy the prompt to your clipboard and provide it to your agent manually. For tools you'd like native support for, feel free to submit an issue — these requests are typically handled quickly.

CLI

# Find dead code in current directory
graphlint query --warn-types "dead_code"

# Full analysis with JSON output
graphlint query --json

# View a specific graph detail
graphlint query -g 1 --detail full

# Exit non-zero when dead code or circular refs found (for CI)
graphlint query --json --fail-on dead_code,circular_ref

# Treat all public items as entry points (library analysis mode)
graphlint query --public-as-entry

# Rebuild index
graphlint build --force

# Configure
graphlint config show
graphlint config set --key lang --value en

Exit Codes

Use --fail-on with a comma-separated list of warning types to make graphlint query return exit code 2 when matching warnings are found. This enables CI pipeline integration without blocking on non-critical warnings.

Graphlint is static-analysis based and cannot recognize certain Python dynamic references (e.g., getattr, importlib), which may produce unexpected exit codes. Only use --fail-on for CI blocking behavior when you're confident in your configuration. Agents are better suited for logic that requires contextual judgment. See Limitations for details.

Python API

from graphlint.api import query

# Find dead code components
result = query(warn_types="dead_code", json_output=True)

# Full dependency graph analysis
result = query(include_tests=True, json_output=True)

Warning Types

Development

# Clone the repository
git clone https://github.com/AngelosZou/graphlint.git
cd graphlint

# Create a virtual environment
python -m venv env
env/Scripts/activate  # Windows
source env/bin/activate  # Unix

# Install dev dependencies
pip install -e ".[dev]"

# Run tests
pytest

# Run with coverage
pytest --cov=graphlint

# Run type checking
mypy graphlint/

# Run linting
ruff check graphlint/ tests/

Configuration

Graphlint stores its configuration in .graphlint/config.json within the analyzed directory. Use graphlint config commands to manage settings, or edit the file directly.

See graphlint config show for the full default configuration.

Documentation

Full documentation is available in the docs/ directory:

• Getting Started
• Agent Integration
• Configuration Guide
• Entry Point Detection
• Warning Reference
• CLI Usage
• Architecture Overview
• Python API

Limitations

• Static analysis only — graphlint performs static analysis and cannot detect runtime linkage such as getattr, importlib, or dynamic dispatch patterns, which may result in false positives. This primarily affects Python; Rust's static dispatch model produces fewer false positives. Mitigation: add custom entry rules matching your codebase's conventions. For example, graphlint's own codebase uses function_def:_detect_* and function_def:visit_* patterns to prevent functions discovered via getattr from being flagged as dead.
• Python dynamic imports — due to Python's dynamic import mechanisms (importlib, getattr, metaclasses, etc.), the default entry templates may produce false positives in codebases that rely heavily on runtime dispatch. Users should tune the entry_rules configuration to match their project's conventions.
• Rust macro expansion — tree-sitter parses unexpanded source; procedural macros and macro_rules! bodies appear as opaque token trees. Some macro-generated call paths may be missed. #[derive] attributes are partially recognized via implicit inherit edges.
• C# partial classes & reflection — tree-sitter parses each .cs file independently; partial class fragments are merged into a single logical node via part_of edges, but members called only through reflection (Activator.CreateInstance, DI container registration) may be missed, similar to Python's dynamic import limitations.
• --public-as-entry scope — this flag applies to languages with public visibility declarations (Rust pub, C# public). It has no effect on Python files. Toggling this flag triggers a full re-index. For long-term library analysis, prefer enabling the rust_pub_api entry rule via graphlint config to persist the setting.
• Large codebase build time — on a large codebase with 700+ .py files, 1,000+ classes, and 14,000+ functions, a full rebuild takes approximately 200 seconds (actual performance depends on hardware). Small projects (~60 files) complete in ~1 second. This cost is one-time, after the initial full scan, subsequent queries use incremental updates.

License

MIT — see LICENSE for details.

Links

• GitHub Repository
• Issue Tracker
• PyPI Package