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Software & DevOpsAny

Run a self-hosted, sandboxed software factory

One developer's build log of an almost fully self-hosted, sandboxed agentic pipeline for producing software.

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Time saved
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Setup time
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Running cost
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Cost range
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Use case overview

One developer's build log of an almost fully self-hosted, sandboxed agentic pipeline for producing software.

Read the original report ↗

Reported experience

  1. What they did

    The author put Hermes, an agent using Codex, on a spare eBay PC with no inbound internet access. The box ran Coolify, Forgejo, self-hosted Firecrawl and Tailscale. One prompt asked for a calorie-tracking SvelteKit app. The agent created the repo, wrote the code and tests, fixed CI failures, and deployed the app with its own Postgres.

  2. How it went

    It reached a deployed app with no further prompts. One CSRF bug turned up on first use, and a single follow-up prompt got it diagnosed, fixed, covered by regression tests and redeployed.

  3. Worth knowing

    The only specific ongoing cost is a £20 Codex subscription. The sandbox is not harmless: the agent can still wipe the box and misuse any keys you give it.

Example prompts

Try with Claude Code
Help me design a sandboxed pipeline where coding agents build [project idea] inside Docker containers with no access to my personal files or credentials. Write the container setup, a task queue folder, and a script that runs one agent on one task and saves the result as a branch. Finish when I can run one example task end to end, and show me the plan before running anything that touches the network.

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