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MCP Builder

Agent Building
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.

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QUICK START

How to use this skill

Bring this guide into your coding agent with a prompt tailored to the tool you use.

  1. Open your project in Codex.
  2. Copy and paste the prompt below.
  3. Review files and risks before approving any action.
Prompt to paste
Inspect the Agent Skill at https://github.com/Hmbown/CodeWhale/blob/HEAD/crates/tui/assets/skills/mcp-builder/SKILL.md and all supporting files. Report provenance, permissions, scripts, dependencies, and security risks. Propose an exact installation into .agents/skills/mcp-builder, but wait for my approval before writing files or running scripts.

Copying this prompt does not install or run the skill. Review third-party files before use.

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:

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.