Sycophant.Auth.GithubCopilot (sycophant v0.4.2)

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Authentication strategy for GitHub Copilot.

Supports two credential modes:

  • Managed — caller supplies :github_token (OAuth token or PAT). The strategy exchanges it for a short-lived Copilot token via Sycophant.Auth.GithubCopilot.TokenCache and surfaces :base_url and :copilot_token back into the credential map.

  • Escape hatch — caller supplies an already-exchanged :copilot_token. No exchange happens; the base URL falls back to :base_url from credentials, then to a hardcoded constant.

Editor identity headers (copilot-integration-id, editor-version, editor-plugin-version, user-agent) gate which models Copilot exposes. Defaults match the VS Code Copilot Chat extension. Override via the credential map.