contextforge

ContextForge

Context-aware intelligence for Claude Code. Automatic codebase indexing, semantic RAG retrieval, and persistent cross-session memory.

ContextForge is a Claude Code plugin that transforms stateless coding sessions into context-aware, learning systems. It automatically indexes your codebase, retrieves relevant code via semantic search, captures coding conventions, and maintains persistent memory across sessions.

Requirements

• Python 3.10+
• Git (for incremental indexing)
• Claude Code (CLI)

Installation

As a Claude Code Plugin

claude --plugin-dir /path/to/context_forge

ContextForge will automatically bootstrap on the first session start:

1. Creates a virtual environment in .contextforge/venv
2. Installs dependencies (sentence-transformers, tree-sitter, numpy)
3. Indexes the codebase and builds a knowledge graph
4. Starts injecting context into your sessions

Manual Bootstrap

cd /path/to/your/project
bash /path/to/context_forge/scripts/bootstrap.sh

How It Works

Session Start

When a Claude Code session starts or resumes, ContextForge:

• Indexes new/changed files since the last session (incremental via git)
• Chunks source files using tree-sitter AST parsing (with regex and sliding-window fallbacks)
• Embeds code chunks using all-MiniLM-L6-v2 sentence transformer (GPU-accelerated when available)
• Builds a lightweight knowledge graph of file relationships
• Injects an architectural summary and memory context into the session

RAG Retrieval

On each user prompt, ContextForge:

• Embeds the user's question
• Searches stored code chunks by cosine similarity
• Injects the most relevant code snippets as additional context
• Skips short prompts, slash commands, and conversational messages

Memory Capture

When files are written or edited, ContextForge:

• Extracts coding conventions (service patterns, model patterns, API styles, etc.)
• Records file change events with session tracking
• Builds a persistent convention database that grows over time

Real-time Reindex

Modified files are re-chunked and re-embedded in real time, keeping the RAG index current within the session.

Slash Commands

Command	Description
/contextforge:context-status	Show index state, file counts, conventions
/contextforge:context-rebuild	Force full re-index of the codebase
/contextforge:context-memory	Manage persistent memory (list, clear, forget)

GPU Acceleration

ContextForge automatically detects and uses the best available compute device for embeddings:

Device	When used
CUDA	NVIDIA GPU with CUDA drivers detected
MPS	Apple Silicon Mac (M1/M2/M3/M4)
CPU	Fallback when no GPU is available

No configuration needed — detection is automatic. To force a specific device, set embedding.device in your config:

{
  "embedding": {
    "device": "cpu"
  }
}

Configuration

ContextForge uses sensible defaults. To customize, create .contextforge/config.json in your project:

{
  "retrieval": {
    "relevance_threshold": 0.4,
    "max_results": 10
  },
  "memory": {
    "convention_threshold": 5
  },
  "indexing": {
    "max_file_size_bytes": 1048576
  }
}

See config/defaults.json for all available options.

Data Storage

All ContextForge data is stored in .contextforge/ within your project directory:

File	Purpose
embeddings.db	SQLite database of code chunk embeddings
memory.db	Conventions and file change history
graph.json	Knowledge graph of file relationships
index_state.json	Git watermark for incremental indexing
venv/	Python virtual environment
models/	Cached embedding model files
config.json	User configuration overrides (optional)

The .contextforge/ directory is automatically added to .gitignore.

Cross-Platform Support

ContextForge works on Windows, macOS, and Linux. The hook runner script uses bash (Git Bash on Windows) and all Python code uses pathlib.Path for path handling.

Development

Running Tests

# Unit tests (requires pytest)
python -m pytest tests/ -v

# Integration test
bash tests/test_integration.sh

Project Structure

contextforge/
├── .claude-plugin/plugin.json    # Plugin manifest
├── commands/                     # Slash command definitions
├── skills/contextforge/          # Skill definition
├── hooks/hooks.json              # Hook configuration
├── scripts/                      # Hook scripts and bootstrap
│   └── lib/                      # Core Python library modules
├── config/defaults.json          # Default configuration
└── tests/                        # Unit and integration tests

License

MIT - See LICENSE for details.