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Agent skill

MCP Builder

by codewhale-hq in codewhale-hq/Codewhale

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

MITAuto-check passedAgent Workflows

Install MCP Builder

skills CLI
$ npx skills add codewhale-hq/Codewhale --skill mcp-builder -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install codewhale-hq/Codewhale mcp-builder --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/codewhale-hq/Codewhale.git skills-src && mkdir -p .claude/skills && cp -r skills-src/crates/tui/assets/skills/mcp-builder .claude/skills/mcp-builder && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
mcp-builder
GitHub stars
41k
Token cost
~378 tokens
SKILL.md length
161 words
Files
1
Skills in repo
63
Repo updated
First seen
Licence
MIT

At a glance

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

  • Works in 6 steps: Define the service boundary and the… → Choose transport and credential handling. → Implement the server using a maintained… → …
  • Tasks that involve MCP servers
  • SKILL.md covers Design Rules, Codewhale Setup and Workflow
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

MCP Builder is an agent skill from codewhale-hq/Codewhale. Design, build, configure, or debug Model Context Protocol servers for codewhale, including stdio and HTTP/SSE transports.

Its SKILL.md is about 380 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Agent Workflows, covering MCP servers. It works with Model Context Protocol. The repository describes itself as: Open-source coding agent for your terminal, built in Rust and on a journey of continuous community improvement. Issues and PRs welcome. The licence is MIT.

When your agent uses it

  • Tasks that involve MCP servers

Example prompts

  • “/mcp-builder”

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

  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 codewhale mcp add or edit ~/.codewhale/mcp.json.
  5. Run codewhale mcp validate, then codewhale mcp tools.
  6. Test one happy path and one failure path before calling it done.

What it can do on your machine

Read from SKILL.md and the folder at commit fead51e. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are bash).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

MCP Builder loads about 378 tokens when it runs. Until then it costs about 33 tokens; SKILL.md has 161 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~33
When it runs · the whole SKILL.md, loaded when a task matches
~378

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from codewhale-hq/Codewhale at commit fead51e, republished under its MIT licence (© codewhale-hq). 161 words, ~378 tokens.

Download SKILL.mdSave it as .claude/skills/mcp-builder/SKILL.md (or your agent's skills folder).
name
mcp-builder
description
Design, build, configure, or debug Model Context Protocol servers for codewhale, including stdio and HTTP/SSE transports.

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.

Codewhale Setup

Common commands:

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

HTTP/SSE entries can include per-server headers in ~/.codewhale/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 codewhale mcp add or edit ~/.codewhale/mcp.json.
  5. Run codewhale mcp validate, then codewhale mcp tools.
  6. Test one happy path and one failure path before calling it done.

© codewhale-hq, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in crates/tui/assets/skills/mcp-builder of codewhale-hq/Codewhale.

Open the folder on GitHubat commit fead51e

Compare with similar skills

MCP Builder next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

MCP Builder compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
MCP Builder this skillcodewhale-hq/Codewhale41k—~378Automated safety check: PassMIT
MCP Server Builderanthropics/skills180k64 repos~2.3kAutomated safety check: PassApache-2.0
MCP Server BuildershareAI-lab/learn-claude-code78k5 repos~1.2kAutomated safety check: PassMIT
MCP Integration for Pluginsanthropics/claude-plugins-official38k11 repos~3.1kAutomated safety check: PassApache-2.0
Fastmcp Client CLIPrefectHQ/fastmcp28k1 repos~823Automated safety check: PassApache-2.0
Crush Configurationcharmbracelet/crush29k—~3.7kAutomated safety check: PassCustom licence

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Works with

Categories

Questions about MCP Builder

What does MCP Builder do?

Design, build, configure, or debug Model Context Protocol servers for codewhale, including stdio and HTTP/SSE transports. MCP Builder is an agent skill from codewhale-hq/Codewhale. Design, build, configure, or debug Model Context Protocol servers for codewhale, including stdio and HTTP/SSE transports.

When should I use MCP Builder?

MCP Builder fits situations like: tasks that involve MCP servers.

How do I install MCP Builder in Claude Code?

Run `npx skills add codewhale-hq/Codewhale --skill mcp-builder -a claude-code`. Or copy the skill folder (crates/tui/assets/skills/mcp-builder in codewhale-hq/Codewhale) into .claude/skills/mcp-builder in your project. Claude Code loads it when a task matches its description.

How do I install MCP Builder in Codex?

Run `npx skills add codewhale-hq/Codewhale --skill mcp-builder -a codex`. Or copy the skill folder (crates/tui/assets/skills/mcp-builder in codewhale-hq/Codewhale) into .agents/skills/mcp-builder in your project. Codex loads it when a task matches its description.

Can I use MCP Builder in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add codewhale-hq/Codewhale --skill mcp-builder -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/mcp-builder, .gemini/skills/mcp-builder, .github/skills/mcp-builder and .opencode/skills/mcp-builder in your project.

What does MCP Builder need to run?

SKILL.md names no scripts, command-line tools or credentials: MCP Builder is instructions for the agent only.

Does MCP Builder access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is MCP Builder safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does MCP Builder use?

MCP Builder is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does MCP Builder use?

About 378 tokens (SKILL.md is roughly 1.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to MCP Builder?

Skills that share tags, products or a category with MCP Builder: MCP Server Builder (anthropics/skills, 180k stars), MCP Server Builder (shareAI-lab/learn-claude-code, 78k stars), MCP Integration for Plugins (anthropics/claude-plugins-official, 38k stars) and Fastmcp Client CLI (PrefectHQ/fastmcp, 28k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains MCP Builder?

codewhale-hq (a GitHub organization) maintains it in codewhale-hq/Codewhale, which has 41,079 GitHub stars. The repository holds 63 skills in this directory. The repository was last updated on October 8, 2026.

Source: codewhale-hq/Codewhale on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.