pstack is a collection of plain Agent Skills and engineering principles that guide AI-assisted software development across coding agents such as Claude Code, Codex, Pi, Cursor, and OpenCode. It is for developers who want reusable practices for tasks including testing, technical writing, debugging, review, and coordinating agent work. The catalogue entries are the project's skills, agents, and plugin.
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.
git clone --depth 1 https://github.com/backnotprop/pstackWrote 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/agents/backnotprop/pstack/poteto-agent)<a href="https://agentmods.dev/agents/backnotprop/pstack/poteto-agent"><img src="https://agentmods.dev/badge/agents/backnotprop/pstack/poteto-agent/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/agents/backnotprop/pstack/poteto-agent"><img src="https://agentmods.dev/badge/agents/backnotprop/pstack/poteto-agent.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 | $0.00110 | $0.00311 |
| Opus 5.5 | $0.00044 | $0.00124 |
| Sonnet 5.5 | $0.00022 | $0.00062 |
| Haiku 4.5 | $0.00011 | $0.00031 |
Grade A, and why
poteto-agent 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 3d 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.
This is a copy
86% identical to poteto-agent — 5 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
Poteto subagent
You are operating as poteto-mode's full agent style. The chat that receives /poteto-mode owns the playbook, the todo list, and every Task spawn. You are one of its delegates. Read the poteto-mode skill's SKILL.md in full before doing any work, including its inline Principles index. Use the absolute path your parent gave you. With no path, before any other work, search ~/.cursor/plugins/ for a file whose path ends in skills/poteto-mode/SKILL.md. If more than one file matches, use the copy whose .cursor-plugin/plugin.json has the highest version. Your skill catalog hides this skill, so a missing catalog entry does not mean pstack is absent. If no such file exists, stop and tell your parent. Navigate to a leaf principle-* skill whenever you apply that principle.
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.
- 3d ago Changed 979f18abd000
- 5d ago Changed · +18 tokens per session 5cbeb2c1fea6
- 13d ago Changed · +14 tokens per session abe41c169ecb
- 1mo ago First seen · 10 lines · 78 tokens per session scan A c3850be1b97b
poteto-agent is an agent published in the GitHub repository backnotprop/pstack (2,115 stars, last pushed 3d ago), licensed MIT. It adds 110 tokens to every session and 311 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 86% identical to poteto-agent, differing in 5 lines, and is treated as a copy.
Other agents, from other repositories
apa-specialist
APA 7th edition compliance specialist for academic manuscripts, covering citation formatting, table/figure styling, document structure, and Quarto/papaja implementation.
artisan
Handmade craft specialist who transforms raw natural materials — plant fibres, wood, leather, blades — into functional handmade artifacts through papermaking, hand-tool sharpening and maintenance, and material preservation.
quarto-developer
Quarto CLI specialist for multilingual QMD files, technical documentation, books, websites, presentations, dashboards, and manuscript publishing.
advocatus-diaboli
Constructive contrarian for rigorous assumption-testing, counterargument generation, Socratic questioning, and logical fallacy detection — steelmans opposing positions before challenging claims.
citizen-entomologist
Curiosity-driven insect guide that celebrates discovery, uses common names alongside scientific names, and channels observations into citizen science platforms like iNaturalist and BugGuide.
diffusion-specialist
Diffusion process specialist bridging cognitive drift-diffusion models and generative AI diffusion models for parameter estimation and implementation.