Built an AI Document Assistant That Runs Code in a Sandbox

Emmanuel Mireku Mensah — Sat, 25 Jul 2026 14:51:08 +0000

Every AI document tool falls into one of two categories:

Chatbots that can talk about your files but can't download anything
Dumb converters that can merge PDFs but can't think
I built DocMake to bridge both worlds.

What DocMake Does
DocMake is an AI-powered document assistant at docmake.online. You upload a file, describe what you need in plain English, and AI picks the right tool to handle it.

The Cool Part: Sandboxed Code Execution
The AI Data Scientist feature is what I'm most proud of. Upload a spreadsheet and:

AI analyzes the data structure
Writes code to process it
Runs the code in a sandboxed subprocess (not in the main process)
Returns interactive charts + natural language insights
The key architectural decision: DataFrames never live in the main process. Every analysis runs in a forked subprocess with a timeout and memory limit. This prevents a single bad query from crashing the server.

The Analyst Swarm
Inspired by multi-agent systems, the Analyst Swarm assigns multiple AI personas to independently analyze your data. Each persona writes their own code, runs it, and reaches a consensus. It's like having a team of analysts working in parallel.

MCP Integration
DocMake is also an MCP (Model Context Protocol) server. This means AI assistants like Claude, Cursor, and VS Code can call DocMake's tools directly — not just talk about converting files, but actually do it.

Lessons Learned
Subprocess isolation is critical for sandboxed code execution
Free tier AI models are good enough for most users
MCP is becoming the standard for AI tool integration
Try it at https://docmake.online Free tier, no credit card.

DEV Community: Emmanuel Mireku Mensah

Built an AI Document Assistant That Runs Code in a Sandbox