# Concurrent Safe State Machines

> Design deterministic state machines that remain correct under concurrent rendering and re-entrancy.

- Skill: `majiayu000/concurrent-safe-state-machines` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add majiayu000/concurrent-safe-state-machines`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/concurrent-safe-state-machines/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/concurrent-safe-state-machines

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# Concurrent-Safe State Machines (React 18)

## Summary

Design deterministic state machines that remain correct under concurrent rendering and re-entrancy.

## Key Capabilities

- Apply idempotent reducers and effect cleanup patterns.
- Model state transitions as pure functions with replay tolerance.
- Prevent torn reads during interleaved renders.

## PhD-Level Challenges

- Prove invariants under double-invocation in StrictMode.
- Provide a correctness argument for side-effect isolation.
- Stress-test state transitions under randomized scheduling.

## Acceptance Criteria

- Document state invariants and transition table.
- Demonstrate correctness under StrictMode double effects.
- Provide property-based tests for state machine correctness.