Trvl: MCP server, setup and security

What Trvl does

According to its repository: “Door-to-door travel MCP + CLI: flights, hotels, trains, cars, ferries. No API keys, Go binary.”

An MCP server gives an AI agent extra tools it calls during the conversation: the agent reads their description, decides to use them and gets the result back. Trvl is listed under Terminal and OS, a category of 115 servers in the directory, where it ranks #69 by stars.

Topics declared by the repository: cli, flight-search, golang, google-flights, google-hotels, hotel-search.

Installing and connecting Trvl

Distribution modes declared in the official MCP registry:

• Docker (OCI) image
• npm package (Node.js, usually started with npx)

Like any MCP server, you declare it in your client's configuration (Claude Desktop, Claude Code, Cursor, VS Code, Codex…): a name, the command that starts it or its URL, and any environment variables. The client then starts it and lists its tools. Project language: Go.

The registry lists 30 secret variables to provide (API key, access token). Keep them in the client's environment variables, never in a shared file or a repository.

Security: what to check

An MCP server runs code with the rights you give it, and the model reads its tool descriptions: a malicious or compromised server can hijack the agent. Read the code, or pick a maintained and widely used server, before connecting it.

Points found for Trvl:

• System access: the Terminal and OS 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.
• Secrets: the server acts with your credentials. Create a dedicated key with minimum rights and an expiry date.
• 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 2, 2026, the MikkoParkkola/trvl repository has 89 stars and 9 forks, with 4 open issues. It has more stars than 64% of the servers in the directory. It received changes this month. Version published in the registry: 1.27.0 (October 10, 2026).

Stars measure attention, not quality: a recent, heavily promoted project can collect them fast, while a useful but niche server will have few.