Fossil FAQs

Question 1

What is Fossil and what problem does it solve?

Accepted Answer

Fossil is a static analysis toolkit designed specifically for projects using AI-assisted coding. It solves the common problems of 'vibe coding' by detecting dead code, structural code clones, temporary scaffolding, and disconnected functions that often accumulate in AI-generated codebases.

Question 2

How does Fossil uniquely benefit AI-assisted development workflows?

Accepted Answer

Unlike traditional linters, Fossil builds a cross-file code graph, allowing AI agents (and developers) to understand function connectivity and potential 'blast radii' for changes. It also functions as an MCP server, integrating with tools like Claude Code and Cursor for real-time, context-aware analysis, saving LLM tokens and costs.

Question 3

What types of code quality issues can Fossil detect?

Accepted Answer

Fossil detects unreachable functions, unused exports, structural code clones (Type 1, 2, 3), temporary scaffolding (e.g., 'TODO', 'Phase N' comments, placeholder bodies), and temporary files left behind during AI development sessions. It also provides a code graph for call analysis.

Question 4

What programming languages and integrations does Fossil support?

Accepted Answer

Fossil performs static analysis across 15 programming languages with framework-aware detection for ecosystems like React, Django, and Spring. It integrates seamlessly as an MCP server with popular AI coding tools and IDEs, including Claude Code, Cursor, VS Code, and Windsurf.

Question 5

Is Fossil difficult to set up and use?

Accepted Answer

No, Fossil is designed for ease of use. Written in Rust, it's a fast, single-binary CLI with zero configuration required. You can quickly install pre-built binaries or via Cargo and run it immediately to analyze your codebase.

Fossil

Fossil

Key Features

Use Cases

Key Features

Use Cases