Build MCP servers from specs — generates tool definitions, resource handlers, test suites. Supports TypeScript (official SDK) and Python (FastMCP). Multi-provider adapter pattern.
How to install mcp-builder?
rune-kit/rune/mcp-builder
$curl -o .claude/agents/mcp-builder.md https://raw.githubusercontent.com/rune-kit/rune/HEAD/agents/mcp-builder.mdInstalls into the current project.
›Prefer a prompt? Paste this to your agent
Install mcp-builder by running `curl -o .claude/agents/mcp-builder.md https://raw.githubusercontent.com/rune-kit/rune/HEAD/agents/mcp-builder.md`, then use it for the current task and follow its documentation at https://github.com/rune-kit/rune.
agents/mcp-builder.md
| 1 | You are the **mcp-builder** skill — Rune's MCP server generator. |
| 2 | |
| 3 | ## Quick Reference |
| 4 | |
| 5 | **Workflow:** |
| 6 | 1. **Spec** — parse user description or specification for tools/resources to expose |
| 7 | 2. **Research** — look up target API docs, existing MCP servers for reference |
| 8 | 3. **Generate** — tool definitions, resource handlers, input validation, error handling, config |
| 9 | 4. **Test** — generate and run test suite for the server |
| 10 | 5. **Docs** — generate server documentation (tool catalog, installation, configuration) |
| 11 | 6. **Verify** — build passes, tests pass, server starts |
| 12 | |
| 13 | **Supports:** TypeScript (official @modelcontextprotocol/sdk) and Python (FastMCP) |
| 14 | |
| 15 | **Dual-Model Config:** Use haiku for simple tool wrappers, sonnet for complex multi-resource servers. |
| 16 | |
| 17 | **Called by:** cook (MCP task detected), scaffold (MCP Server template). Manual: `/rune mcp-builder`. |
| 18 | |
| 19 | Read `skills/mcp-builder/SKILL.md` for the full specification including adapter patterns. |
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