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An MCP server that gives agents a sandboxed Lisp REPL
- andreasronge 4mo agoI’ve been working on an open source MCP server that gives AI agents (or coding assistants) a stateful, sandboxed REPL using a small Clojure-like language. The main idea is that an agent should be able to explore MCP tools more like a developer explores an API from a REPL, instead of having every schema, tool response, and intermediate result pushed into the model context. Example (done over multiple REPL sessions): (mcp/servers) (dir 'github) (doc 'github/search_issues) (apropos "calendar") (let [r (tool/mcp-call {:server "fs" :tool "read_text_file" :args {:path "/tmp/sandbox/notes.md"}})] (if (:ok r) (count (split-lines (:value r))) (fail (:message r)))) The reason I built a small custom Clojure-like language instead of using Python/JS is so I can fit the needs of the LLM: easy to sandbox, give good feedback to LLM as well as operational (handle many concurrent low latency stateful connections) https://github.com/andreasronge/ptc_runner/blob/main/mcp_server/README.md https://github.com/andreasronge/ptc_runner/blob/main/mcp_ser...