# MCP Builder

> MCP Builder is an Agent Skill for agent building published in the Hmbown/CodeWhale repository on GitHub: a SKILL.md instruction file an AI agent can load to do this task.

Design, build, configure, or debug Model Context Protocol servers for codewhale, including stdio and HTTP/SSE transports.

- Skill name: `mcp-builder`
- Category: [Agent Building](https://www.openparable.com/skill/agent-building/1)
- Source: https://github.com/Hmbown/CodeWhale/blob/HEAD/crates/tui/assets/skills/mcp-builder/SKILL.md
- Repository: Hmbown/CodeWhale (39,823 GitHub stars when collected)

## SKILL.md

# MCP Builder

Use this skill when the user asks to create, configure, or debug an MCP server
or tool integration.

## Design Rules

- Prefer stdio MCP servers for local tools and HTTP/SSE for remote services.
- Keep tool schemas small, typed, and explicit. Return structured JSON where
  possible.
- Put secrets in environment variables, never in committed config.
- For HTTP/SSE clients, send `Accept: application/json, text/event-stream` by
  default unless the server explicitly requires something else.
- Add timeouts and clear error messages around external APIs.

## DeepSeek Setup

Common commands:

```bash
deepseek mcp init
deepseek mcp add my-server --command node --arg server.js
deepseek mcp add remote-server --url http://127.0.0.1:3000/mcp
deepseek mcp list
deepseek mcp validate
deepseek mcp tools
```

HTTP/SSE entries can include per-server headers in `~/.deepseek/mcp.json` when
credentials or custom routing headers are required.

## Workflow

1. Define the service boundary and the minimum useful tools.
2. Choose transport and credential handling.
3. Implement the server using a maintained MCP SDK when available.
4. Add the server with `deepseek mcp add` or edit `~/.deepseek/mcp.json`.
5. Run `deepseek mcp validate`, then `deepseek mcp tools`.
6. Test one happy path and one failure path before calling it done.

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Source: https://www.openparable.com/skill/agent-building/mcp-builder (OpenParable). Cite the canonical URL above.