GitHub Copilot

GitHub Copilot supports MCP in VS Code (Agent mode only) and via the Copilot CLI.

WARNING

VS Code Copilot uses "servers" as the top-level key — not "mcpServers" like every other agent. The kcp-harness integrate command handles this automatically.

Setup

kcp-harness integrate copilot

This generates:

.vscode/mcp.json

{
  "servers": {
    "kcp-harness": {
      "type": "stdio",
      "command": "npx",
      "args": ["kcp-harness", "serve"]
    }
  }
}

Note the "servers" key and the additional "type": "stdio" field.

.github/copilot-instructions.md

Instructions for Copilot's agent mode, including governed paths, rules, and available MCP tools.

Agent Mode Required

MCP tools are only available in Copilot's Agent mode. They don't work in Ask or Edit mode. In VS Code, switch Copilot Chat to Agent mode to access kcp-harness tools.

Copilot CLI

For Copilot CLI, add to ~/.copilot/mcp-config.json instead:

{
  "mcpServers": {
    "kcp-harness": {
      "command": "npx",
      "args": ["kcp-harness", "serve"],
      "tools": ["*"]
    }
  }
}

Generate with:

kcp-harness integrate copilot-cli