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mavdol/capsule/mcp-server

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Secure runtime to sandbox AI agent tasks. Run untrusted code in isolated WebAssembly environments.

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mavdol/capsule/mcp-server

Added 1 June 2026

#agentic-workflow#ai-agents#code-execution#code-interpreter#javascript#llm#python#rust
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Overview

A secure runtime that sandboxes AI agent tasks by running untrusted code in isolated WebAssembly environments. It is implemented in Rust and integrates as an MCP server for agent workflows.

Best for

Best for
Developers building AI agents that need to execute untrusted code safely

Use cases

  • Executing untrusted code from AI agents without host compromise
  • Isolating third-party plugins or user scripts in a sandbox
  • Running agent-generated code in a controlled, ephemeral environment

How to use

Install

pip install capsule-run

Tools exposed

  • HOST_PATH

Clients listed in this record (not verified here)

ChatGPT

Notes

288 stars on GitHub. Last updated 2026-05-26. Licensed Apache-2.0.

Pros

  • Strong isolation via WebAssembly sandboxing
  • Memory-safe implementation in Rust reduces vulnerabilities
  • Lightweight runtime suitable for agent task execution

Cons

  • Limited to code that compiles to WebAssembly, excluding many native libraries
  • Performance overhead compared to native execution for compute-heavy tasks
  • Requires integration with an MCP-compatible agent framework

Open-source & AI alternatives

Swap-in tools that solve the same job. Weigh the trade-offs before you commit.

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