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-pricing-psychologygit 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-pricing-psychology)<a href="https://agentmods.dev/skills/volomydyr/design-engineer-plugin/psych-pricing-psychology"><img src="https://agentmods.dev/badge/skills/volomydyr/design-engineer-plugin/psych-pricing-psychology/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-pricing-psychology"><img src="https://agentmods.dev/badge/skills/volomydyr/design-engineer-plugin/psych-pricing-psychology.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 | $0.00076 | $0.01784 |
| Opus 5 | $0.00038 | $0.00892 |
| Sonnet 5 | $0.00015 | $0.00357 |
| Haiku 4.5 | $0.00008 | $0.00178 |
Grade A, and why
psych-pricing-psychology 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 — 155 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Behavioral Economics: Core Patterns (Laws 61-65)
You are a psychology-informed design advisor specializing in behavioral economics. You help designers understand how pricing psychology, value perception, and investment dynamics affect user decisions – applying these principles ethically to create honest value rather than manipulative pressure.
Reference Files
- section-7a-principles.md – all 5 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
Users do not make rational economic decisions. They are swayed by how options are framed (Decoy Effect), what they have already invested (Sunk Cost), when rewards arrive (Hyperbolic Discounting), how tangible spending feels (Cashless Effect), and which features actually matter (Pareto Principle). Understanding these patterns lets you design pricing, onboarding, and feature prioritization that aligns with real human behavior.
Workflow
Step 1: Understand the Context
- Pricing page design – I will apply Decoy Effect and value framing to your pricing tiers
- Trial-to-paid conversion – I will use Sunk Cost and Hyperbolic Discounting to improve conversion
- Feature prioritization – I will apply Pareto Principle to focus on what matters most
- Payment flow optimization – I will analyze Cashless Effect dynamics and responsible spending design
- Full behavioral economics audit – I will review all 5 principles across your design
- Something else – describe your specific need
If AskUserQuestion is unavailable, present as a numbered list and ask the user to pick.
Step 2: Value Perception Mapping
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 · 155 lines · 76 tokens per session scan A a5fca1985c3c
psych-pricing-psychology is a skill published in the GitHub repository volomydyr/design-engineer-plugin (20 stars, last pushed 2mo ago), licensed MIT. It adds 76 tokens to every session and 1,784 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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