OneTool MCP
One MCP for developers — no tool tax, no context rot. 100+ tools including Brave, Google, Tavily, Context7, Excalidraw, AWS, Excel, Database, Playwright, Chrome DevTools, and more. Install once, access everything.
What is OneTool MCP?
OneTool MCP is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to one mcp for developers — no tool tax, no context rot. 100+ tools including brave, google, tavily, context7, excalidraw, aws, excel, database, playwright, chrome devtools, and more. install once, acces...
One MCP for developers — no tool tax, no context rot. 100+ tools including Brave, Google, Tavily, Context7, Excalidraw, AWS, Excel, Database, Playwright, Chrome DevTools, and more. Install once, access everything.
This server falls under the Developer Tools category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- One MCP for developers — no tool tax, no context rot. 100+ t
Use Cases
Maintainer
Works with
Installation
Manual Installation
npx onetool-mcpConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use OneTool MCP
OneTool MCP is a unified Python MCP server that bundles 100+ developer tools from 27+ packs into a single MCP installation, eliminating the 'tool tax' where AI clients must read large tool-definition schemas on every request. It integrates web search (Brave, Google, Tavily), documentation lookup (Context7), browser automation (Playwright, Chrome DevTools), database tools, file operations, Excel processing, PDF conversion, image vision, diagramming (Excalidraw), AWS operations, RAG knowledge base, and LLM transforms — all accessible via code-style invocations that consume approximately 2,000 tokens instead of the 150,000+ tokens typical for many separate MCP servers.
Prerequisites
- Python 3.10 or higher
- uv package manager installed (`pip install uv` or via the uv installer)
- Claude Code, Claude Desktop, or another MCP-compatible client
- API keys for the specific tool packs you want to use (e.g., Brave Search API key, Tavily API key)
- Optional: Docker for containerized deployment
Install OneTool MCP via uv
Install the package with all optional tool packs using uv tool install. The [all] extra includes every available pack.
uv tool install 'onetool-mcp[all]'Initialize the configuration directory
Run onetool init to create the default configuration files at ~/.onetool including onetool.yaml and secrets.yaml.
onetool init --config ~/.onetoolConfigure API keys in secrets.yaml
Edit ~/.onetool/secrets.yaml to add API keys for the tool packs you want to use. Each pack that requires a key has a documented entry.
# ~/.onetool/secrets.yaml example entries:
brave_search_api_key: YOUR_BRAVE_API_KEY
tavily_api_key: YOUR_TAVILY_API_KEY
# Add other keys as needed for your selected packsRegister with your MCP client
Add OneTool MCP to Claude Code or Claude Desktop. Use `claude mcp add` to register the server pointing to the onetool serve command with your config and secrets paths.
claude mcp add onetool -- onetool serve \
--config ~/.onetool/onetool.yaml \
--secrets ~/.onetool/secrets.yamlOptionally disable telemetry
To opt out of telemetry, set the DO_NOT_TRACK environment variable or disable it in onetool.yaml.
export DO_NOT_TRACK=1
# Or in ~/.onetool/onetool.yaml:
# telemetry:
# enabled: falseOneTool MCP Examples
Client configuration
Claude Desktop configuration for OneTool MCP using the onetool serve command with config and secrets files.
{
"mcpServers": {
"onetool": {
"command": "onetool",
"args": [
"serve",
"--config", "/Users/me/.onetool/onetool.yaml",
"--secrets", "/Users/me/.onetool/secrets.yaml"
],
"env": {
"DO_NOT_TRACK": "1"
}
}
}
}Prompts to try
Use these prompts in Claude after OneTool MCP is connected to access the full suite of integrated developer tools.
- "Search the web for 'React 19 new features' using Brave search"
- "Look up the Context7 documentation for the Zod library and show me the schema validation API"
- "Open Chrome DevTools for http://localhost:3000 and check the console for errors"
- "Query my local Postgres database: SELECT count(*) FROM users WHERE created_at > '2026-01-01'"
- "Convert this PDF at /tmp/report.pdf to markdown and summarize the key points"
- "Create an Excalidraw diagram showing a three-tier web architecture with load balancer, app servers, and database"Troubleshooting OneTool MCP
onetool command not found after uv tool install
Run `uv tool list` to confirm installation. If listed but not on PATH, add the uv tools bin directory to your PATH: typically ~/.local/bin on Linux/macOS. Run `uv tool install --force 'onetool-mcp[all]'` to reinstall.
A specific tool pack (e.g., Brave search) returns authentication errors
Ensure the required API key is present in ~/.onetool/secrets.yaml with the correct key name. Obtain the key from the provider (Brave Search API at https://api.search.brave.com, Tavily at https://app.tavily.com) and re-run `onetool serve`.
Claude sees very few tools even though all packs are installed
OneTool uses code-style invocations to reduce token overhead, so the tool list may appear smaller than expected. Ask Claude: 'What tool packs are available in onetool and how do I invoke the brave.search tool?' to discover the full capability set.
Frequently Asked Questions about OneTool MCP
What is OneTool MCP?
OneTool MCP is a Model Context Protocol (MCP) server that one mcp for developers — no tool tax, no context rot. 100+ tools including brave, google, tavily, context7, excalidraw, aws, excel, database, playwright, chrome devtools, and more. install once, access everything. It connects AI assistants to external tools and data sources through a standardized interface.
How do I install OneTool MCP?
Follow the installation instructions on the OneTool MCP GitHub repository. Clone the repo, install dependencies, and add the server config to your AI client.
Which AI clients work with OneTool MCP?
OneTool MCP works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is OneTool MCP free to use?
Yes, OneTool MCP is open source and available under the GPL 3.0 license. You can use it freely in both personal and commercial projects.
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Set Up OneTool MCP in Your Editor
Choose your AI client for step-by-step setup instructions.
Quick Config Preview
Add this to your claude_desktop_config.json or .cursor/mcp.json
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