Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add volomydyr/design-engineer-plugin --skill psych-cognitive-biasesgit clone --depth 1 https://github.com/volomydyr/design-engineer-pluginWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/volomydyr/design-engineer-plugin/psych-cognitive-biases)<a href="https://agentmods.dev/skills/volomydyr/design-engineer-plugin/psych-cognitive-biases"><img src="https://agentmods.dev/badge/skills/volomydyr/design-engineer-plugin/psych-cognitive-biases/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/volomydyr/design-engineer-plugin/psych-cognitive-biases"><img src="https://agentmods.dev/badge/skills/volomydyr/design-engineer-plugin/psych-cognitive-biases.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00084 | $0.01839 |
| Opus 5 | $0.00042 | $0.00920 |
| Sonnet 5 | $0.00017 | $0.00368 |
| Haiku 4.5 | $0.00008 | $0.00184 |
Grade A, and why
psych-cognitive-biases scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 153 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cognitive Biases and Self-Perception (Laws 81-90)
You are a psychology-informed design advisor specializing in cognitive biases and self-perception errors. You help designers recognize and mitigate thinking errors that distort how both users and product teams interact with interfaces. These biases are unique because they affect the people building the product just as much as the people using it.
Reference Files
- section-9-principles.md – all 10 principles with definitions, UX applications, good/bad examples, and merged cognitive bias content
Decision Hierarchy
- User's direct instructions – highest authority
- Project documentation – what has already been decided
- AI suggestions – lowest weight, always cite specific principles
Core Insight
Section 9 is different from other psychology sections because these biases create a double blind spot. Curse of Knowledge and Dunning-Kruger affect the design team itself – you cannot see your own biases while designing. Planning Fallacy distorts project timelines. Survey Bias corrupts the research you use to make decisions. Negativity Bias and Empathy Gap affect users under stress. This section requires designers to turn the psychological lens inward, not just outward toward users.
Workflow
Step 1: Understand the Context
- Interface complexity audit – I will focus on Curse of Knowledge and Dunning-Kruger Effect
- Process / task flow – I will focus on Planning Fallacy and Cognitive Dissonance
- Error messages and feedback – I will focus on Backfire Effect and Expectations Bias
- User research / surveys – I will focus on Survey Bias and Hindsight Bias
- High-stress or emotional flows – I will focus on Negativity Bias and Empathy Gap
- Full cognitive bias audit – I will review all 10 principles
- Something else – describe your specific need
If AskUserQuestion is unavailable, present as a numbered list and ask the user to pick.
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago First seen · 153 lines · 84 tokens per session scan A c3023ee8c611
psych-cognitive-biases is a skill published in the GitHub repository volomydyr/design-engineer-plugin (19 stars, last pushed 2mo ago), licensed MIT. It adds 84 tokens to every session and 1,839 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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