@brunobrise/xfeat

@brunobrise/xfeat is an automated, AI-driven CLI engine that deeply analyzes your codebase to extract product-level features, component architectures, and global system scopes. By combining precise AST-based structural parsing (via web-tree-sitter) with the reasoning capabilities of Anthropic's Claude Sonnet 4.6, this tool auto-generates comprehensive, human-readable documentation of what your code actually does.

Key Features

• AST-Powered Parsing: Fast and accurate structural footprint generation (classes, functions, exports, imports) for modern ecosystem languages.
• Agentic Source Code Reading: Rather than guessing based off function identifiers, the AI utilizes a specialized view_file tool to selectively dive into the raw source code wherever AST context is insufficient.
• Automated Mermaid Diagrams: Visually maps out how files interact at macro and global architecture levels.
• Structured Markdown Deliverables: Produces a neat, hierarchical FEATURES.md report encompassing everything from the executive summary to granular file logic.
• Smart Directory Traversal: Adheres to your local .gitignore and optional custom .xfeatignore rules to avoid processing build artifacts and generic dependencies.

How It Works

The engine executes in an expanding 4-stage pipeline:

0. AI Pre-filtering (Stage 0):

   • Interactively requests permission to AI-filter the target files.
   • Cleans the file list by intelligently removing trivial boilerplate, config files, and UI assets dynamically, saving time and tokens.

1. Micro Analysis (File-Level):

   • Identifies granular structural signatures across source files.
   • Leverages an LLM sub-agent loop to request file contents as needed.
   • Outputs 1-2 sentence overviews alongside high-level feature bullet points for each file.

2. Macro Analysis (Component-Level):

   • Groups files logically by their enclosing directory.
   • Synthesizes isolated file summaries into a curated Component Summary.
   • Generates localized Mermaid.js flow/architecture diagrams per directory.

3. Global Analysis (System-Level):

   • Ties localized component summaries together into a master architecture overview.
   • Documents the core pillars and overarching domain of the application.
   • Renders a highly-abstracted global Mermaid architecture diagram representing the entire system interaction.

Installation

You can run @brunobrise/xfeat directly via npx without installing it globally:

npx @brunobrise/xfeat

Configuration

Create a .env file at the root of the project to define your API authorization:

# Required: Your Anthropic API Key
ANTHROPIC_API_KEY="sk-ant-..."

# Optional Environment Overrides
ANTHROPIC_AUTH_TOKEN=""
ANTHROPIC_BASE_URL=""
CLAUDE_CODE_SUBAGENT_MODEL="claude-sonnet-4-6"

Usage

You can scan the immediate working directory, or pass a relative/absolute path to dynamically scan another repository on your machine.

Scan Current Directory

npx @brunobrise/xfeat

Scan Remote Directory Path

npx @brunobrise/xfeat /path/to/your/custom/project

Development Tooling

For developers contributing to this tool, standard npm scripts are available:

• npm run dev — Hot-reloads the analysis script using Nodemon.
• npm run lint — Analyzes the source using ESLint against best practices.
• npm run format — Standardizes code styling uniformly with Prettier.

Expected Output

The script concludes by generating a structured FEATURES.md record at your execution root. Inside, you can expect:

1. Global Architecture Overview (Executive Summary, Application Pillars, Main System Diagram)
2. Component Breakdown (Directory-by-Directory Insights, Narrow Context Diagrams)
3. File-Level Details (Deeply granular feature lists)

Supported Languages

The foundational Tree-sitter AST parser natively understands:

• JavaScript (.js, .jsx)
• TypeScript (.ts, .tsx)
• Python (.py)
• Rust (.rs)
• Go (.go)
• Java (.java)
• PHP (.php)

License

This tooling is open-sourced under the MIT License.

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Built organically with the Anthropic SDK and Tree-sitter.