SandboxTrace — Reproducible sandbox and traffic audit for coding agents

Run agents in a standard sandbox and record all network requests for debugging and compliance

Problem

A developer demonstrated a reproducible sandbox using Docker and proxy tools to capture all traffic from coding agents, showing concerns about agents running wild locally and accessing unknown networks. But building this is hard, especially for indie devs without security background.

Solution

An out-of-the-box sandbox runner that provides a standardized, reproducible Docker environment for coding agents, with built-in network traffic capture and filtering. Users can see which domains the agent accessed, what data was uploaded, and replay failed tasks.

Users

Indie developers and small teams running coding agents locally, especially those handling sensitive code or needing compliance audits

MVP

Provide preset Docker images supporting major agents; capture and display HTTP/HTTPS traffic summaries; support domain allow/block lists; save sandbox snapshots for replay on failure; output simple audit logs

Revenue

Open-source core sandbox; paid version with team-shared snapshots, audit log export, and compliance reports

Why now

Coding agents increasingly access local files and network, but sandbox setup is complex. A Show HN project validated the direction, but there's no easy product for average developers.