@r33drichards
Basic information
MCP server that exposes a V8 JavaScript runtime as a tool for AI agents like Claude and Cursor. Supports persistent heap snapshots via S3 or local filesystem, and is ready for integration with modern AI development environments.
No standard config provided
This server doesn't expose a parseable MCP config block in its README. See the repository for install instructions.
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mcp-v8 is a Model Context Protocol server, written in Rust, that lets an AI agent run JavaScript and TypeScript in a sandboxed V8 isolate. Instead of wiring up dozens of narrow tools, it gives the agent one tool—run_js—and the agent writes code that can loop, branch, transform data, and call other tools. It is designed for AI agents that need a flexible, stateful code execution environment.
Install the server via the provided curl script (install.sh) or use nix run, Docker, or build from source. Connect an MCP client by adding mcp-v8 with flags like --stateless or --directory-path to the client's mcpServers configuration. The server can also run over HTTP using mcp-v8 --stateless --http-port 8080. Configuration can be done entirely through CLI flags or a single TOML/JSON config file.
run_js tool that executes JavaScript/TypeScript in an isolated V8 engine.fetch, filesystem, subprocess, and external imports controlled via OPA/Rego.In stateful mode, the V8 heap is saved as a content-addressed snapshot after each run, allowing an agent to build up state across many turns. In stateless mode no heap is persisted—the script runs and returns output immediately.
Network requests (`fetch`), filesystem access (`fs.*`), subprocess execution (`child_process`), and external ES module imports are all off by default. They must be explicitly enabled via OPA/Rego policies.
`setInterval` is not available (use a loop with `setTimeout`). There is no DOM or browser APIs. TypeScript is type-stripped but not type-checked, and JSX/TSX is not supported.
Policies are set via CLI flags (e.g., `--policy-fetch`, `--policy-fs`, `--policy-subprocess`) that point to Rego policy files, or through the corresponding sections in a TOML/JSON config file.
Yes, the server natively implements the MCP tasks utility over Streamable HTTP and stdio. A client can run `run_js` as a task by adding a `task` object to the request, then poll with `tasks/get` and `tasks/result`.
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