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muxlayer guides/use-claude-code-with-github-copilot

Claude Code + Copilot

Use Claude Code with GitHub Copilot through MuxLayer

MuxLayer turns Claude Code's Anthropic Messages entry into a local model entry, then routes selected requests to Claude models available through a GitHub Copilot subscription. This is optional and intended for personal evaluation; using Copilot outside official clients may be a gray area under GitHub's terms.

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When to use this

Use this guide if you want:

  • Claude Code to use Copilot-provided Claude models without a separate Anthropic API key.
  • MuxLayer to exchange a GitHub OAuth token for a Copilot API credential automatically.
  • Tool continuations and history compaction requests tagged as agent traffic so they do not consume premium user requests.
  • Logs that show the x-initiator classification per request.

Risk disclosure

This feature is optional. If you do not add a copilot provider, MuxLayer never uses this path.

Using a Copilot subscription outside official clients is a terms-of-service gray area. Community tools with similar behavior have existed for a long time, but account risk cannot be ruled out. Avoid using important corporate accounts for experiments.

Quick Setup

  1. Make sure you have an active GitHub Copilot subscription.
  2. Get a GitHub OAuth token. If you are signed into VS Code Copilot, check ~/.config/github-copilot/apps.json for oauth_token.
  3. Open MuxLayer, go to Providers, and add a provider with type GitHub Copilot.
  4. Paste the gho_ or ghu_ token as the API key. MuxLayer fills the base URL and model list.
  5. Start the gateway from Overview or Gateway.
  6. Open Clients and apply the Claude Code config.
  7. Send a test message and check Logs for provider GitHub Copilot and x-initiator classification.

What MuxLayer handles

Area Behavior
Credential exchange GitHub OAuth token is exchanged for a Copilot bearer credential and renewed automatically.
Storage Copilot credentials are cached by hash and are not stored as plaintext tokens.
Premium request classification User messages are tagged as user traffic; tool continuations and compaction are tagged as agent traffic.
Model names Claude Code model names such as claude-sonnet-4-6 are normalized to Copilot's expected form.

Troubleshooting

Symptom Check
Token exchange fails Confirm the token starts with gho_ or ghu_ and belongs to an account with Copilot access.
Model is rejected Check the Copilot provider's model list after saving the provider.
Premium requests look higher than expected Open request logs and compare x-initiator: user vs x-initiator: agent.
You want to avoid this path Remove or disable the Copilot provider and use DeepSeek, MiMo, Anthropic, or another provider.

Related

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