# Deterministic Checks

> - | First paid or state-changing external/native attempt or retry | [Retry readiness](references/retry-readiness.md) |.

- Skill: `sgaabdu4/deterministic-checks-2` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add sgaabdu4/deterministic-checks-2`
- Raw SKILL.md: https://api.skillmd.com/api/skills/sgaabdu4/deterministic-checks-2/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: sgaabdu4 (https://skillmd.com/u/sgaabdu4)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/sgaabdu4/deterministic-checks-2

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- | First paid or state-changing external/native attempt or retry | [Retry readiness](references/retry-readiness.md) |.
- Gate efficiency = one execution per exact tree + actor + required seam.
- rerun only after tree/environment/mechanism change or invalid receipt.
- duplicate equivalent setup/build/gate = `FAIL`.
- Compatible real-tool proof = interpreter/compiler/runner behavior.
- Paid/native retry = [Retry readiness](references/retry-readiness.md) PASS first.