# Enclave Seatbelt

> Enclave Seatbelt (macOS)

- Skill: `latchagent/enclave-seatbelt` (Agent Skill)
- Install (CLI): `npx skillmds@latest add latchagent/enclave-seatbelt`
- Raw SKILL.md: https://api.skillmd.com/api/skills/latchagent/enclave-seatbelt/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: latchagent (https://skillmd.com/u/latchagent)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/latchagent/enclave-seatbelt

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# Enclave Seatbelt (macOS)

## What This Module Does

The Seatbelt Enclave (`src/main/lib/sandbox/seatbelt-enclave.ts`) provides a native macOS sandbox backend using `sandbox-exec` and `pf` (packet filter). It runs agent shells inside a Seatbelt profile that denies all access except explicitly allowed operations.

## Seatbelt Profile

Generated per-session with deny-by-default:
- **Filesystem:** Only workspace directory, /tmp, and system libraries
- **Network:** Only loopback to proxy and authz ports — all other network denied
- **Process:** Only shell binary and /usr/bin, /bin utilities
- **Blocked:** ~/.ssh, ~/.gnupg, ~/.aws, shell history files

## pf Rules

Network forcing rules redirect all outbound TCP from the sandbox to the proxy port and block UDP/53 (DNS exfiltration prevention). Applied via `pfctl`.

## Key API

- `generateProfile(opts)` — Create Seatbelt .sb profile
- `generatePfRules(opts)` — Create pf rule set
- `buildSpawnArgs(opts)` — Get command + args for `sandbox-exec -f profile.sb /bin/sh`
- `writeProfile(profile)` — Write to temp file, returns path
- `detect()` — Check if sandbox-exec is available (macOS only)
- `destroy()` — Clean up temp files

## Testing

Run: `npx vitest run src/main/lib/sandbox/seatbelt-enclave.test.ts`