Claude Forge

[!WARNING] Research Preview -- Forge is under active development. APIs, commands, and file formats may change without notice between releases. Not recommended for production use.

The missing connective tissue for Claude Code.

Forge is a CLI that wraps Claude Code, adding persistent sessions, multi-model routing, and autonomous verification. You run forge session start instead of claude, and Forge handles the rest -- routing to your chosen model provider, tracking state across sessions, and enforcing policies.

# Use Claude with session tracking (no proxy needed)
forge session start

# Or route through different model providers (after creating proxies -- see Quick Start)
forge session start planner --proxy litellm-openai    # GPT for planning
forge session start --proxy litellm-gemini            # Gemini for review

Why Forge?

Claude Code talks to Anthropic and tracks conversations. Forge adds an operational layer on top:

• Session Tracking -- Named sessions that persist artifacts, plans, and transcripts. Works with or without a proxy.
• Multi-Model Routing -- Route to GPT, Gemini, or any LiteLLM-supported model through a local proxy.
• Context Compatibility -- When routing to models with different context windows, Forge sets the native CLAUDE_CODE_AUTO_COMPACT_WINDOW so compaction timing matches the routed model.
• Autonomous Loops -- Verification policies that keep Claude working until tests pass.
• Session Resume -- When context fills up, hand off to a fresh session with AI-curated history.
• Policy Engine -- TDD enforcement, coding standards, and semantic alignment checks.
• Multi-Model Review -- Fan out code reviews to multiple models, get adversarial consensus.

Why launch through Forge?

Running claude directly bypasses session tracking. When you launch through Forge (forge session start), you get:

Even without a proxy, forge session start gives you session tracking, hooks, and the status line (direct mode is the default). The proxy adds multi-model routing on top. (forge claude start is also available as a bare launcher with proxy routing only, no session state.)

How it Works

Forge runs a local LiteLLM proxy that translates Claude Code's Anthropic API calls into requests for any LLM provider. Claude Code connects to this proxy (via ANTHROPIC_BASE_URL), and Forge handles model selection, session state, and policy enforcement.

Claude Code  -->  Forge Proxy (local)  -->  LiteLLM  -->  OpenAI / Google / Anthropic
                       |
                  Session state, policies, artifacts

Non-local templates (e.g., litellm-openai) connect to a shared LiteLLM deployment via LITELLM_BASE_URL. The -local variants (e.g., litellm-openai-local) start a local LiteLLM instance for you -- just provide an API key, no shared infrastructure needed.

Direct mode (the default) skips the proxy and talks to Anthropic directly. forge session start gives you session tracking, hooks, and all Forge features except multi-model routing. Use --proxy to add routing.

Requirements

• Platform: macOS or Linux
• Python: 3.11–3.13 (3.14 blocked on upstream uvloop wheels — see #1)
• Claude Code: installed and on PATH
• API key: at least one provider key (e.g., ANTHROPIC_API_KEY, GEMINI_API_KEY, OPENAI_API_KEY)

Quick Start

# Install Forge
pip install tr-claude-forge

# Or for development (editable install from local clone):
git clone https://github.com/thomsonreuters/claude-forge.git
cd claude-forge && pip install -e .

# Install extensions (hooks, skills, status line) into Claude Code
forge extension enable

# Launch Claude with session tracking (no proxy needed)
forge session start

# Or with multi-model routing (remote LiteLLM):
forge authentication login -p litellm-remote     # Store API key + base URL
forge proxy create litellm-openai                # Create a proxy (connects to shared LiteLLM)
forge proxy start litellm-openai --smoke-test    # Verify upstream connectivity
forge session start --proxy litellm-openai

# No shared LiteLLM? Use a -local template instead (starts LiteLLM for you):
# forge authentication login -p litellm-local
# forge proxy create litellm-openai-local

Once running, try /forge:walkthrough inside Claude Code for a guided tour in a sandboxed test environment.

Upgrading from Pre-OSS Forge

Existing pre-OSS Forge installs are not supported in-place. If upgrading:

1. If Claude Code was previously patched, run claude update or reinstall Claude Code for a pristine binary.
2. Remove stale Forge state: rm ~/.forge/installed.json
3. Re-enable extensions: forge extension enable
4. If you had FORGE_CONTEXT_LIMIT in your shell config, remove it. Use CLAUDE_CODE_AUTO_COMPACT_WINDOW for native Claude Code behavior, or forge config set context_limit=N for Forge proxy fallback.

Example Workflow: Plan, Execute, Review

With proxies configured, a typical feature workflow looks like:

# 1. Start a planning session with a high-reasoning model
forge session start planner --proxy litellm-openai
# ... Claude creates a plan, you approve it, /exit

# 2. Fork the planner into a worktree with plan supervision
forge session fork planner --name executor --worktree --supervise
# ... Claude implements the plan; supervisor auto-checks every Write/Edit

# 3. Context fills up? Resume with AI-curated history (supervisor config carries over)
forge session resume executor --fresh --strategy ai-curated
# ... keeps working with fresh context

# 4. Fork the planner into the executor's worktree to review
forge session fork planner --into ../executor-worktree  # Path to executor's worktree
# ... reviews with full plan context, suggests fixes

# 5. Push and create a PR for human review
git push origin feature-branch

Each step uses the best model for the job. The --supervise flag wires the planner as a semantic supervisor -- every code change is checked against the approved plan. Sessions track artifacts and transcripts automatically, so context flows across forks and resumes. See the end-user guide for the full tour, or run /forge:walkthrough inside Claude Code for an interactive walkthrough.

CLI Overview

Run forge <command> --help for details on any command.

Documentation

Contributing

See CONTRIBUTING.md for development setup and PR guidelines.

Uninstall

forge extension disable
pip uninstall tr-claude-forge

License

Apache 2.0 -- see LICENSE.