Canonical definition
If one person from a group does something bad, does that mean they’re all like that? That’s Ultimate Attribution Error – the tendency to attribute an individual’s actions to their entire group, especially for negative behavior.

Free cognitive-bias Agent Skill
Use Ultimate Attribution Error as a focused cognitive-bias lens. Explain the pattern, check whether it plausibly fits the situation, surface an alternative non-bias explanation, and return a practical counter-check without diagnosing people or claiming causation.
What the agent should do
If one person from a group does something bad, does that mean they’re all like that? That’s Ultimate Attribution Error – the tendency to attribute an individual’s actions to their entire group, especially for negative behavior.
Install
Hermes Agent
mkdir -p ~/.hermes/skills/bias-attribution-bias-ultimate-attribution-error && curl -fsSL https://cognitive-biases.github.io/agent-skills/bias-attribution-bias-ultimate-attribution-error/SKILL.md -o ~/.hermes/skills/bias-attribution-bias-ultimate-attribution-error/SKILL.mdOpenClaw
mkdir -p ~/.openclaw/workspace/skills/bias-attribution-bias-ultimate-attribution-error && curl -fsSL https://cognitive-biases.github.io/agent-skills/bias-attribution-bias-ultimate-attribution-error/SKILL.md -o ~/.openclaw/workspace/skills/bias-attribution-bias-ultimate-attribution-error/SKILL.mdOther Agent Skills-compatible tools
Download SKILL.md and put it in the skill directory or import surface supported by your agent.
Boundary
The skill must preserve uncertainty, surface a non-bias explanation and avoid turning a cognitive-bias label into a claim about a person's motives, intelligence or mental health.