← All skills

agentsop-state-reducer

100 / 100 · Low risk

Fine to try.

By agentsope/SkillAlchemy (GitHub) · writing · 469 stars · scanned at commit 955562e

Tool skill for declaring reducers on LangGraph state keys so parallel writes merge instead of crashing. Activates whenever a coder agent designs a StateGraph with parallel branches, fan-out via Send, multi-agent topologies, or whenever a run raises `InvalidUpdateError: At key '<k>': Can receive only one value per step`. Encodes the rule "every state key is single-writer or has a reducer — nothing in between."

Works with any agent that supports SKILL.md skills.

What this skill can do

We found nothing in the files we read that matches our rules. That does not prove the skill is safe: see the limits of static scanning.

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'agentsop-state-reducer' ] || [ -L ~/.agents/skills/'agentsop-state-reducer' ]; then echo 'A skill folder named agentsop-state-reducer already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/agentsope/SkillAlchemy' "$d" && git -C "$d" checkout --quiet '955562e4416c483da946e9c95a1c3974ac52df3c' -- 'skills/agentsop-state-reducer' && mkdir -p ~/.agents/skills && cp -R "$d"/'skills/agentsop-state-reducer' ~/.agents/skills/'agentsop-state-reducer' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'agentsop-state-reducer' ~/.claude/skills/'agentsop-state-reducer' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

Badge for your README

The badge for agentsope/SkillAlchemy shows the score of its lowest-scoring skill.

[![SkillTrust](https://zalavijaysinh.github.io/skilltrust/badges/agentsope/SkillAlchemy.svg)](https://zalavijaysinh.github.io/skilltrust/repos/agentsope/SkillAlchemy/)

Score history