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Copilot Server

The Copilot MCP bridge wraps the copilot -p CLI, exposing it as an MCP server with two tools: ask and code_review.

Tools​

ask​

Ask GitHub Copilot a freeform question.

Tool: ask
Input:
  question: string (required, max 500KB)
Output:
  string (text response)

code_review​

Send a diff for review.

Tool: code_review
Input:
  diff: string (required, max 500KB)
  context: string (optional)
Output:
  JSON or text (JSON when parseable)

How It Works​

  1. Receives an MCP tool call
  2. Spawns copilot -p --output-format json as a subprocess
  3. Parses the JSONL output stream (one JSON object per line)
  4. Extracts the final assistant message
  5. Attempts to parse the response as structured JSON; falls back to raw text

Configuration​

See Environment Variables for all options.

COPILOT_REVIEW_MODEL=            # Model override
COPILOT_MCP_HTTP_PORT=8945       # HTTP proxy port