Agent Toolbelt Mcp
Attach 19 hosted Agent Toolbelt APIs—contract review, prompt optimization, context packing, and more—to your agent via stdio MCP.
Overview
Agent Toolbelt MCP is an MCP server for the Build phase that exposes 19 hosted agent utilities—including contract review, prompt optimization, and context packing—via stdio and an API key.
What is this MCP server?
- 19 focused HTTP-backed tools exposed through one MCP server
- Includes contract review, prompt optimizer, and context packing
- stdio npm package agent-toolbelt-mcp (registry version 1.0.1)
- Requires AGENT_TOOLBELT_KEY; free key at documented Railway signup URL
- GitHub source under marras0914/agent-toolbelt mcp-server subfolder
- 19 focused API tools per server description
- MCP package version 1.0.0; npm package version 1.0.1
- Transport: stdio via agent-toolbelt-mcp on npm
What problem does it solve?
Solo builders waste time chaining one-off HTTP scripts for prompt tuning and context limits instead of callable tools in the agent loop.
Who is it for?
Indie agent users who want a pre-built utility belt for prompts, context, and contract checks without building micro-APIs themselves.
Skip if: Teams that need only local offline tools, strict air-gapped environments, or a single-purpose integration with no cloud API.
What do I get? / Deliverables
After you set AGENT_TOOLBELT_KEY and add the stdio server, the agent can invoke all 19 Toolbelt APIs as named MCP tools during implementation.
- 19 callable MCP tools backed by Agent Toolbelt APIs
- Faster prompt and context workflows without custom HTTP glue
Recommended MCP Servers
Journey fit
Toolbelt utilities cluster where you assemble agent workflows: tightening prompts, packing context, and checking contracts during build. Agent-tooling shelf matches a bundled remote API surface meant to extend agent capability, not a single product feature in your app.
How it compares
Bundled cloud API MCP with 19 tools, not a self-hosted security gateway like Cordon.
Common Questions / FAQ
Who is Agent Toolbelt MCP for?
Solo builders and agent-heavy developers who want nineteen ready-made LLM helper APIs behind one MCP server and one API key.
When should I use Agent Toolbelt MCP?
Use it while building agent features or long coding sessions when you need context packing, prompt optimization, or contract review as explicit tool calls.
How do I add Agent Toolbelt MCP to my agent?
Register the npm stdio server agent-toolbelt-mcp, set AGENT_TOOLBELT_KEY from the free signup at https://agent-toolbelt-production.up.railway.app, and restart your MCP client.