# output-error-nondeterminism

> Claude/Codex skill by [@growthxai](https://omgskills.com/library/growthxai/index.md) · 443 stars · Updated 2026-10-22

Fix non-determinism errors in Output SDK workflows. Use when seeing replay failures, inconsistent results between runs, "non-deterministic" error messages, or workflows behaving differently on retry.

Tags: agents, ai, ai-agents, ai-sdk, claude, claude-code, javascript, llm, nodejs, open-source, reliability, temporal, typescript, workflow-engine, workflows

## Install

```sh
git clone https://github.com/growthxai/output /tmp/output && ln -s /tmp/output/coding_assistants/claude/plugins/outputai/skills/output-error-nondeterminism ~/.claude/skills/output-error-nondeterminism
```

## From README

Fix Non-Determinism Errors Overview This skill helps diagnose and fix non-determinism errors in Output SDK workflows. Workflows must be deterministic because Temporal may replay them during recovery or retries, and the replay must produce identical results. When to Use This Skill You're seeing: "non-deterministic" error messages Replay failures after workflow restart Inconsistent results between runs with same input Errors during workflow recovery Warnings about determinism violations Root Cause Temporal workflows must be deterministic: given the same input, they must always execute the same sequence of operations. This is because Temporal replays workflow history to recover state after crashes or restarts. Non-deterministic operations break this replay mechanism because they produce different values each time. Common Causes and Solutions Math.random() Problem: Random values differ on each execution. Solution: Pass random values as workflow input or generate in a step.

## Links

- HTML page: https://omgskills.com/library/growthxai/output/coding_assistants/claude/plugins/outputai/skills/output-error-nondeterminism/
- GitHub: https://github.com/growthxai/output
- Author: [@growthxai](https://omgskills.com/library/growthxai/index.md)

## More from this repo

- [output-build-workflow](https://omgskills.com/library/growthxai/output/coding_assistants/claude/plugins/outputai/skills/output-build-workflow/index.md) — Implement an Output SDK workflow from a plan document.
   - [@growthxai](https://omgskills.com/library/growthxai/index.md) · 443 stars
- [output-credentials-edit](https://omgskills.com/library/growthxai/output/coding_assistants/claude/plugins/outputai/skills/output-credentials-edit/index.md) — View, edit, and set encrypted credentials in an Output.ai project.
   - [@growthxai](https://omgskills.com/library/growthxai/index.md) · 443 stars
- [output-credentials-env-vars](https://omgskills.com/library/growthxai/output/coding_assistants/claude/plugins/outputai/skills/output-credentials-env-vars/index.md) — Wire encrypted credentials to environment variables using the credential: convention.
   - [@growthxai](https://omgskills.com/library/growthxai/index.md) · 443 stars