Releases·Tool Release
Dev releases Parselbox, an open-source Deno+Pyodide sandbox for programmatic tool calling via MCP
A developer open-sourced Parselbox, a local single-process execution layer for programmatic tool calling built on Deno and Pyodide. It exposes MCP tools, APIs, shells, and host functions as native Python objects so agents can orchestrate tools in code rather than through the context window. It plugs into Claude and Claude Code as an MCP server or runs via a Python API.
1 engagement1 sourceMon, Sep 28, 2026, 12:01 PM
AI Overview
- Parselbox (github.com/thesanjeetc/parselbox) is a single-process, local sandbox built on Deno and Pyodide for programmatic tool calling
- It plugs into Claude or Claude Code as an MCP server, or via a Python API, exposing one execute_code tool so orchestration moves out of the context window
- Tools, APIs, shells, and host functions appear as native Python objects; variables, state, and files persist inside the runtime across a single execution
- The sandbox offers a disk-backed workspace, Python and npm packages, controlled networking and filesystem access, background tasks, and JS/TS plus WASM/WASI interop
- Demo shows a C toolchain (clang and wasm-ld compiled to WebAssembly) running in one sandboxed Deno process, driven from chat via dynamic MCP Apps
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Products·building
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Releases·Tool Release
sandbox-cli launches public beta for secure multi-agent coding in Docker
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