MCP Server Builder
anthropics/skills
Guides the design and implementation of Model Context Protocol servers in TypeScript or Python, from tool naming and error messages to evaluation.
Comprehensive guide for building Model Context Protocol (MCP) servers with support for tools, resources, prompts, and authentication.
Install MCP Builder
$ npx skills add aiskillstore/marketplace --skill mcp-builder -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install aiskillstore/marketplace mcp-builder --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/autumnsgrove/mcp-builder .claude/skills/mcp-builder && rm -rf skills-srcUse ~/.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/
Install the "mcp-builder" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/autumnsgrove/mcp-builder into .claude/skills/mcp-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mcp-builder", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/aiskillstore/marketplace/tree/main/skills/autumnsgrove/mcp-builderType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add aiskillstore/marketplace --skill mcp-builder -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install aiskillstore/marketplace mcp-builder --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/autumnsgrove/mcp-builder .agents/skills/mcp-builder && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "mcp-builder" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/autumnsgrove/mcp-builder into .agents/skills/mcp-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mcp-builder", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add aiskillstore/marketplace --skill mcp-builder -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install aiskillstore/marketplace mcp-builder --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/autumnsgrove/mcp-builder .cursor/skills/mcp-builder && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "mcp-builder" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/autumnsgrove/mcp-builder into .cursor/skills/mcp-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mcp-builder", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/aiskillstore/marketplace.git --path skills/autumnsgrove/mcp-builder--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add aiskillstore/marketplace --skill mcp-builder -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install aiskillstore/marketplace mcp-builder --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/autumnsgrove/mcp-builder .gemini/skills/mcp-builder && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "mcp-builder" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/autumnsgrove/mcp-builder into .gemini/skills/mcp-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mcp-builder", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install aiskillstore/marketplace mcp-builderInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add aiskillstore/marketplace --skill mcp-builder -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/autumnsgrove/mcp-builder .github/skills/mcp-builder && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "mcp-builder" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/autumnsgrove/mcp-builder into .github/skills/mcp-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mcp-builder", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add aiskillstore/marketplace --skill mcp-builder -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install aiskillstore/marketplace mcp-builder --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/autumnsgrove/mcp-builder .opencode/skills/mcp-builder && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "mcp-builder" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/autumnsgrove/mcp-builder into .opencode/skills/mcp-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mcp-builder", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
mcp-builder- GitHub stars
- 430
- Token cost
- ~3.7k tokens
- SKILL.md length
- 614 words
- Files
- 15 (incl. references)
- Skills in repo
- 1,108
- Repo updated
- First seen
- Licence
- None found
At a glance
Comprehensive guide for building Model Context Protocol (MCP) servers with support for tools, resources, prompts, and authentication.
- Works in 10 steps: Tools: Exposing Functions Claude Can Call → Resources: Providing Data/Documentation… → Prompts: Reusable Prompt Templates → …
- Creating custom MCP servers
- SKILL.md covers What is MCP?, Architecture Overview, Core Components and Server Implementation Workflow, plus 3 more sections
- Runs Python scripts from its folder; calls uv and npx; needs API_KEY
What it does
MCP Builder is an agent skill from aiskillstore/marketplace. Comprehensive guide for building Model Context Protocol (MCP) servers with support for tools, resources, prompts, and authentication. Use when: (1) Creating custom MCP servers, (2) Integrating external APIs with Claude, (3) Building tool servers for specialized domains, (4) Creating resource providers for documentation, (5) Implementing authentication and security
Its SKILL.md is about 3.7k tokens, which your agent loads only when the skill is triggered. The skill folder holds 16 other files, including reference files (for example `README.md`, `examples/advanced-server.py` and `examples/database-server.md`).
It sits in Agent Workflows, covering MCP servers. It works with Model Context Protocol. The repository describes itself as: Security-audited skills for Claude, Codex & Claude Code. One-click install, quality verified.
When your agent uses it
- Creating custom MCP servers
- Integrating external APIs with Claude
- Building tool servers for specialized domains
- Creating resource providers for documentation
Example prompts
- “/mcp-builder”
Requirements
- Python 3
- Node.js
- A credential in API_KEY
Workflow steps
10 steps, taken from the step headings in SKILL.md.
- Tools: Exposing Functions Claude Can Call
- Resources: Providing Data/Documentation Access
- Prompts: Reusable Prompt Templates
- Authentication Methods
- Project Setup
- Basic Server Structure
- Tool Registration and Handlers
- Resource Implementation
- Error Handling and Testing
- Claude Desktop Integration
What it can do on your machine
Read from SKILL.md and the folder at commit ad8daf7. 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
Ships script files (Python), which the agent can run.
Shell commands in SKILL.md call:
uvnpx
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
github.commodelcontextprotocol.ioclaude.ai
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names these keys or tokens, usually read from environment variables:
API_KEY
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
MCP Builder loads about 3.7k tokens when it runs, and up to ~13k if it reads all its reference files. Until then it costs about 95 tokens; SKILL.md has 614 words of instructions outside code blocks.
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
Without a licence we can't republish the file, so here is its outline and opening line. It has 614 words (~3,681 tokens).
“Model Context Protocol (MCP) is an open standard created by Anthropic that enables AI assistants like Claude to securely connect to external data sources and tools. Think of it as a universal adapter that allows Claude to interact with any…”
- name
- mcp-builder
Files
SKILL.md and 14 other files (references) in skills/autumnsgrove/mcp-builder of aiskillstore/marketplace.
- SKILL.md
- README.md
- examples/advanced-server.py
- examples/database-server.md
- examples/resource-server.md
- examples/resource-server.py
- examples/rest-api-wrapper.md
- examples/simple-calculator-server.md
- examples/simple-server.py
- references/production-deployment.md
- references/protocol-specification.md
- references/security-guide.md
- references/testing-debugging.md
- references/tool-schemas.md
- skill-report.json
Open the folder on GitHubat commit ad8daf7
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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| MCP Builder this skillaiskillstore/marketplace | 430 | — | ~3.7k | Automated safety check: Pass | None | |
| MCP Server Builderanthropics/skills | 180k | 64 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| MCP Server BuildershareAI-lab/learn-claude-code | 78k | 5 repos | ~1.2k | Automated safety check: Pass | MIT | |
| MCP Integration for Pluginsanthropics/claude-plugins-official | 38k | 11 repos | ~3.1k | Automated safety check: Pass | Apache-2.0 | |
| Fastmcp Client CLIPrefectHQ/fastmcp | 28k | 1 repos | ~823 | Automated safety check: Pass | Apache-2.0 | |
| Crush Configurationcharmbracelet/crush | 29k | — | ~3.7k | Automated safety check: Pass | Custom licence |
Similar skills
- Official
MCP Server Builder
shareAI-lab/learn-claude-code
Walks through building MCP servers in Python or TypeScript that expose tools, resources and prompts to Claude, with templates, registration and testing.
- Official
MCP Integration for Plugins
anthropics/claude-plugins-official
Explains how to bundle Model Context Protocol servers in a Claude Code plugin, covering config files, stdio, SSE, HTTP and WebSocket server types, and authentication.
Fastmcp Client CLI
PrefectHQ/fastmcp
Query and invoke tools on MCP servers using fastmcp list and fastmcp call.
Crush Configuration
charmbracelet/crush
Explains how to configure the Crush coding agent with crushrc or crush.json, covering providers, models, LSPs, MCP servers, hooks, permissions and config precedence.
Context Mode Output Sandbox
mksglu/context-mode
Routes large command, file, API and browser output through context-mode tools so only the needed result enters the agent's context, instead of dumping it via Bash.
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Questions about MCP Builder
What does MCP Builder do?
Comprehensive guide for building Model Context Protocol (MCP) servers with support for tools, resources, prompts, and authentication. MCP Builder is an agent skill from aiskillstore/marketplace. Comprehensive guide for building Model Context Protocol (MCP) servers with support for tools, resources, prompts, and authentication.
When should I use MCP Builder?
MCP Builder fits situations like: creating custom MCP servers; integrating external APIs with Claude; building tool servers for specialized domains; creating resource providers for documentation.
How do I install MCP Builder in Claude Code?
Run `npx skills add aiskillstore/marketplace --skill mcp-builder -a claude-code`. Or copy the skill folder (skills/autumnsgrove/mcp-builder in aiskillstore/marketplace) 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 aiskillstore/marketplace --skill mcp-builder -a codex`. Or copy the skill folder (skills/autumnsgrove/mcp-builder in aiskillstore/marketplace) 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 aiskillstore/marketplace --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?
Going by SKILL.md and its folder, MCP Builder needs Python for the scripts in its folder, the command-line tools its instructions call (uv and npx) and credentials named API_KEY. Our summary lists: Python 3; Node.js; A credential in API_KEY.
Does MCP Builder access the network?
SKILL.md names 3 domains. As links in the text: github.com, modelcontextprotocol.io and claude.ai. 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?
No licence was found for MCP Builder or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does MCP Builder use?
About 3.7k tokens (SKILL.md is roughly 15k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 9.2k tokens, read only when the agent opens those files.
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?
aiskillstore (a GitHub organization) maintains it in aiskillstore/marketplace, which has 430 GitHub stars. The repository holds 1,108 skills in this directory. The repository was last updated on October 7, 2026.
Source: aiskillstore/marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.