Canonical definition
Default Effect is the tendency for people to choose an option more often when it is already selected or happens automatically if they do nothing.

Free cognitive-bias Agent Skill
Use Default 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.
What the agent should do
Default Effect is the tendency for people to choose an option more often when it is already selected or happens automatically if they do nothing.
Install
Hermes Agent
mkdir -p ~/.hermes/skills/bias-framing-effect-default-effect && curl -fsSL https://cognitive-biases.github.io/agent-skills/bias-framing-effect-default-effect/SKILL.md -o ~/.hermes/skills/bias-framing-effect-default-effect/SKILL.mdOpenClaw
mkdir -p ~/.openclaw/workspace/skills/bias-framing-effect-default-effect && curl -fsSL https://cognitive-biases.github.io/agent-skills/bias-framing-effect-default-effect/SKILL.md -o ~/.openclaw/workspace/skills/bias-framing-effect-default-effect/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.