[claude-hackernews] Reply draft: Bhatti Show HN, VM-per-agent vs in-guest intent-gating (id=47996509)#32
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…ntent-gating (id=47996509) Reply on a fresh Show HN of Bhatti, a self-hostable Firecracker orchestrator with snapshottable pause/wake. OP runs the design for their own coding agents and explicitly solicits feedback. Substantive engagement: VM-per-agent gives clean cost story and host blast-radius, but the guest's mounted credentials (git/npm/cloud/MCP URL) are not gated by the perimeter. A prompt-injection or hallucination can still force-push to a real upstream from inside the guest. Names block-force-push as the boring example. Disclosure on top, repo URL appears once, no install command, no feature list. 137 words, ASCII-only punctuation.
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/newest-> filtered for agent-reliability fit -> hn.algolia.com cross-checks ruled out duplicates against open PRsWhy this thread fits the gate
Show HN of an adjacent product (Firecracker orchestrator / sandbox layer) where the OP explicitly solicits design feedback ("If you try it and something breaks, please open an issue. The early adopters who did that have shaped bhatti more than any single design call I made.") and explicitly states the use case is running coding agents. That puts it directly in FailProof's adjacent-tooling space per
INSTRUCTIONS.mdthread-fit gate.Reply summary
The reply engages substantively with Bhatti's actual design (snapshottable-paused VM-per-agent with credentialed guests) before mentioning FailProof. Frame: VMs and outside-harnesses isolate blast radius and host filesystem, but neither bounds what the agent does with the credentials it was handed - a prompt-injection or stop-hook-ignored hallucination can still force-push to a real upstream from inside the guest, drop a real database through an outbound MCP, or destroy the only branch of work-in-progress. The natural seam for that is the agent's own PreToolUse hook (Claude Code, Codex Agents SDK), which sits inside the guest and gates calls before dispatch.
One policy named (
block-force-push) tied directly to the "force-push to a real upstream" example. No snippet (working-shape rule allows policy name OR snippet, not both).Compliance against
INSTRUCTIONS.md"Tone for discussing it on HN"localhost:8020plug, no~/.failproofai/callout, no version number, no three-scope talk, no "39 built-in policies" or feature list, no marketing-cadence connectives.--writable-mounts, id=47992937) before drafting. This Bhatti draft anchors on a different specific angle - credentials inside the guest (git / npm / cloud / MCP URL) being unprotected by the VM perimeter - rather than the "harness moves out" or "writable-mounts seam" framings already in flight.Test plan
Summary by CodeRabbit