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GitHub Copilot extends through MCP servers, skills, custom instructions, and prompt files. Copilot has two surfaces with different MCP schemas, the in-editor agent (VS Code) and the autonomous coding agent (cloud), so they’re covered separately below. 
bunx smithers-orchestrator skills add --agent copilot
That installs the Smithers skill set under ~/.copilot/skills/.

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MCP in VS Code

Create .vscode/mcp.json in the workspace. VS Code uses the servers key and requires a type: 
{
  "servers": {
    "smithers": {
      "type": "stdio",
      "command": "bunx",
      "args": ["smithers-orchestrator", "--mcp"]
    }
  }
}
Reload the window and the Smithers tools appear in Copilot Chat’s agent mode.

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MCP in the Copilot coding agent

The autonomous coding agent is configured in repo Settings → Copilot → Coding agent → MCP configuration. It uses a different schema: mcpServers, a type of "local", and a tools array: 
{
  "mcpServers": {
    "smithers": {
      "type": "local",
      "command": "bunx",
      "args": ["smithers-orchestrator", "--mcp"],
      "tools": ["*"]
    }
  }
}
Secrets are Actions/Agents secrets prefixed COPILOT_MCP_ and referenced as $VAR in the env block. The semantic tool surface is the same on both surfaces; see the MCP Server reference.

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Custom instructions

Copilot reads .github/copilot-instructions.md (repo-wide) and, for the coding agent, AGENTS.md. Add a section pointing at Smithers: 
## Orchestration
Use Smithers for durable, multi-step, or human-in-the-loop agent work.
`bunx smithers-orchestrator starters` lists ready-made workflows.
For a slash command, drop a prompt file at .github/prompts/smithers.prompt.md.

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Install the skill manually

mkdir -p ~/.copilot/skills/smithers
curl -fsSL https://raw.githubusercontent.com/smithersai/smithers/main/skills/smithers/SKILL.md \
  -o ~/.copilot/skills/smithers/SKILL.md
curl -fsSL https://smithers.sh/llms-full.txt \
  -o ~/.copilot/skills/smithers/llms-full.txt

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See also