Free cognitive-bias Agent Skill

Subadditivity Effect

Use Subadditivity Effect 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.

Agent SkillsHermes AgentOpenClawChatGPT SkillsCodex

Open SKILL.md Read canonical bias

What the agent should do

Use one bias carefully, not as a diagnosis.

Canonical definition

The subadditivity effect occurs when separate estimates for parts of an event add up to more than the estimate for the same event described as one category. Unpacking changes the judgement, not the underlying probability. The effect has boundary conditions and can change or reverse with the description of the parts.

Evidence, related concepts and current review state →

Output

  • Plain-language explanation
  • Observed signal
  • Alternative explanation
  • Evidence boundary
  • Practical counter-check
  • What would change the assessment

Install

Free. One SKILL.md. No API key.

Hermes Agent

mkdir -p ~/.hermes/skills/bias-probability-bias-subadditivity-effect && curl -fsSL https://cognitive-biases.github.io/agent-skills/bias-probability-bias-subadditivity-effect/SKILL.md -o ~/.hermes/skills/bias-probability-bias-subadditivity-effect/SKILL.md

OpenClaw

mkdir -p ~/.openclaw/workspace/skills/bias-probability-bias-subadditivity-effect && curl -fsSL https://cognitive-biases.github.io/agent-skills/bias-probability-bias-subadditivity-effect/SKILL.md -o ~/.openclaw/workspace/skills/bias-probability-bias-subadditivity-effect/SKILL.md

Other Agent Skills-compatible tools

Download SKILL.md and put it in the skill directory or import surface supported by your agent.

Boundary

A lens, not a verdict.

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.

Free to install · instruction-only · no secrets · no executable code · no required network access