This fork includes the following enhancements over the upstream project:

• --host option: Bind the server to a specific network interface (e.g., --host 0.0.0.0 for all interfaces, --host 127.0.0.1 for localhost only)
• Adaptive rate limiting: Smart rate limiting with exponential backoff, auto-recovery, and Retry-After support (replaces queue-based limiting)
• Direct Anthropic API: Claude models use Copilot's native Anthropic endpoint without translation overhead
• Smart auto-truncate: Automatically truncates conversation history when exceeding context limits, with optional tool result compression
• /v1/event_logging/batch endpoint: Compatibility endpoint for Anthropic SDK's event logging (returns OK without processing)
• logout command: Remove stored GitHub token with copilot-api logout
• patch-claude command: Patch Claude Code's context window limit to match Copilot's limits
• Tool name length handling: Automatically truncates long tool names (>64 chars) to comply with OpenAI's limit, with hash-based suffix to avoid collisions. Original names are restored in responses.
• Request History UI: Built-in Web UI (enabled by default) to view, search, filter, and export all API requests/responses. Access at /history.

• Fixed missing model field in streaming: The first streaming chunk from Copilot API sometimes has an empty choices array but contains the model name. We now store this for use in subsequent events.
• Auto-fix message sequence errors: When tool calls are interrupted (e.g., by user cancel), the API now automatically adds placeholder tool_result blocks to maintain valid message sequences
• Fixed bunx symlink issue: Changed pre-commit hook to use bun x instead of bunx for better compatibility

• Added CLAUDE.md with project architecture documentation

# Run directly with npx
npx @hsupu/copilot-api start

# Or install globally
npm install -g @hsupu/copilot-api
copilot-api start

You can also install directly from GitHub (requires build step):

npm install -g github:puxu-msft/copilot-api-js
copilot-api start

# Clone the repository
git clone https://github.com/puxu-msft/copilot-api-js.git
cd copilot-api-js

# Install dependencies
bun install

# Development mode (with hot reload)
bun run dev

# Production mode
bun run start

# Build for distribution
bun run build

# Run the built version locally
npx .

# Or link globally
bun link
copilot-api start

Create .claude/settings.json in your project:

{
  "env": {
    "ANTHROPIC_BASE_URL": "http://localhost:4141",
    "ANTHROPIC_AUTH_TOKEN": "dummy",
    "ANTHROPIC_MODEL": "gpt-4.1",
    "ANTHROPIC_SMALL_FAST_MODEL": "gpt-4.1",
    "DISABLE_NON_ESSENTIAL_MODEL_CALLS": "1",
    "CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC": "1"
  },
  "permissions": {
    "deny": ["WebSearch"]
  }
}

Or use the interactive setup:

bun run start --claude-code

For the original project documentation, features, and updates, see: ericc-ch/copilot-api