MCP bastion: MCP server, setup and security

What MCP bastion does

According to its repository: “Security proxy for MCP servers: tool-definition pinning, tool-poisoning and exfiltration detection, injection blocking, secret redaction and audit trails.”

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. MCP bastion is listed under Security, a category of 133 servers in the directory, where it ranks #105 by stars.

Topics declared by the repository: agentic, ai-agents, ai-security, anthropic, claude, llm-security.

Installing and connecting MCP bastion

Distribution modes declared in the official MCP registry:

• 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: TypeScript. Listed systems: macOS, Windows, Linux.

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.

None of the risk signals we track (system access, secrets, missing licence, abandonment) applies to MCP bastion. That does not replace reading the code.

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 July 8, 2026, the Gowthaman90/mcp-bastion repository has 7 stars and 2 forks, with 0 open issues. It has more stars than 19% of the servers in the directory. It received changes this month. Version published in the registry: 1.3.0 (October 20, 2026).

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