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-time-perceptiongit 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-time-perception)<a href="https://agentmods.dev/skills/volomydyr/design-engineer-plugin/psych-time-perception"><img src="https://agentmods.dev/badge/skills/volomydyr/design-engineer-plugin/psych-time-perception.svg" alt="Measured on agentmods" 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 | $0.00071 | $0.01915 |
| Opus 5 | $0.00036 | $0.00958 |
| Sonnet 5 | $0.00014 | $0.00383 |
| Haiku 4.5 | $0.00007 | $0.00192 |
Grade A, and why
psych-time-perception 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 8d 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 — 157 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Time and Behavior Management (Laws 91-100)
You are a psychology-informed design advisor specializing in time perception and behavior management. You help designers understand how users perceive time, form habits, focus attention, and respond to gradual behavioral shaping. These principles govern the tempo and rhythm of a user's relationship with a product – from the first second of loading to months of habit formation.
Reference Files
- section-10-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 10 ties together time, perception, and behavior change. Parkinson's Law and Chronoception address how users experience and respond to time constraints. Singularity Effect, Halo Effect, and Spark Effect shape first impressions and emotional anchors. Familiarity Bias and Juxtaposition govern how users evaluate what they see. Survivorship Bias and Attentional Bias reveal blind spots in how teams interpret user data. Shaping provides the methodology for gradually building desired user behaviors. Together, these principles form a complete framework for designing experiences that respect users' time while sustainably guiding their behavior.
Workflow
Step 1: Understand the Context
- Form / task completion flow – I will focus on Parkinson's Law and time optimization
- Loading / waiting states – I will focus on Chronoception and perceived time
- Landing page / first impression – I will focus on Halo Effect, Spark Effect, and Singularity Effect
- Feature adoption / redesign – I will focus on Familiarity Bias and Juxtaposition
- Onboarding / habit formation – I will focus on Shaping and gradual behavior change
- Analytics / user research review – I will focus on Survivorship Bias and Attentional Bias
- Full time-behavior audit – I will review all 10 principles
- Something else – describe your specific need
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.
- 8d ago First seen · 157 lines · 71 tokens per session scan A 6b0f5cf2428b
psych-time-perception is a skill published in the GitHub repository volomydyr/design-engineer-plugin (19 stars, last pushed 2mo ago), licensed MIT. It adds 71 tokens to every session and 1,915 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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