Code execution · MCP server
Openapi MCP: MCP server, setup and security
Openapi MCP is an MCP server published on GitHub that lets an AI agent access any API through its existing OpenAPI documentation description. Its repository has 198 stars and its last commit is from March 21, 2026, but it declares no licence.
What Openapi MCP does
According to its repository: “Access any API through its existing OpenAPI documentation.”
The Model Context Protocol (MCP) is a standard plug between an AI agent and an outside service: once the server is connected, its tools show up in the agent, which decides when to call them. Openapi MCP is listed under Code execution, a category of 32 servers in the directory, where it ranks #10 by stars.
Installing and connecting Openapi MCP
No package or remote server is declared in the official MCP registry: you install it from source, following the repository README.
It works with any MCP-compatible client (Claude Desktop, Claude Code, Cursor, VS Code, Codex and most recent agents). You add one entry to the client's MCP configuration: server name, start command or URL, environment variables. Project language: Go.
Security: what to check
Connecting an MCP server means installing software that talks straight to your agent: it runs with your rights and the model trusts its tool descriptions. The risk therefore depends on what it can touch and how far its code can be trusted.
Points found for Openapi MCP:
- System access: the Code execution category gives the agent control over files, a terminal, code or a browser. A booby-trapped instruction in content the agent reads (prompt injection) can then turn into an action.
- No licence: without a licence the code is not legally reusable, even if it is public. Avoid it in a company setting without the author's agreement.
Good practice: grant only the rights needed (least privilege), require human approval for irreversible actions, and run the AI agent security check.
Project activity and maintenance
Created on April 22, 2025, the ckanthony/openapi-mcp repository has 198 stars and 41 forks, with 6 open issues. It has more stars than 77% of the servers in the directory. Last change 7 months ago.
Stars measure attention, not quality: a recent, heavily promoted project can collect them fast, while a useful but niche server will have few.
Verdict
Openapi MCP is still a modest project: read its code and compare it with the alternatives before using it.
Strengths
- Widely followed: 198 stars
Limitations
- No commit for 7 months
- No licence declared
- Install from source
Avoid if…
- You cannot isolate the agent (sandbox, container)
- Company use without the author's agreement
Alternatives
- Container use4.1K ★
- LLM Sandbox1.1K ★
- Tidewave Phoenix858 ★
- Superserve466 ★
- OrcaReplay281 ★
- Mailtrap66 ★
Learn more
Frequently asked questions
How do I install Openapi MCP?
No package is declared in the MCP registry: clone the ckanthony/openapi-mcp repository, follow its README, then declare the start command in your client's MCP configuration.
Is Openapi MCP free?
The code is public but has no declared licence: it is not formally free to reuse.
Is Openapi MCP safe?
Points to watch: system access and no licence. Give it minimum rights and approve sensitive actions.
Is it an official server?
Nothing says so: it is a project published by ckanthony on GitHub. Check who maintains it before giving it access.
What are the alternatives to Openapi MCP?
In the same category: Container use, LLM Sandbox, Tidewave Phoenix, and Superserve. Container use and LLM Sandbox score higher on our grid.
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Neutrality. No affiliate links. No vendor pays to be reviewed, rated or ranked. Reviews are directed by François Chollet, neutral and factual, and every data point is dated and sourced. How we score