postgrok

pstack

Properties3
tagstool, coding-agents, skills, cursor, verification
typeentity
statusseedling

3 min read

pstack

lauren-tan’s skill and workflow stack for rigorous engineering with coding agents. It is a Cursor plugin, not a new model or a hosted service. It gives an agent engineering principles, task playbooks, focused skills, and small local CLIs. She built it from the workflows she uses to ship code at Cursor, and her published account is that it lets her ship about 2,000 pull requests a month to production with high confidence; the stream raises that to 2,500.

The captions of 2026-10-05-youtube-poteto-software-factory keep transcribing the name as “PAC”. It is pstack.

How it is shaped

  • The default entry point is poteto-mode, the routing hub. You give it a task in plain language and it dispatches to the matching playbook, runs the code to check real behavior instead of accepting a passing build, and carries the work to a review-ready pull request when asked.
  • It ships verification skills, the piece she calls the most important thing in the toolkit. See agent-verification-skill. Her /create-verification-skill distills the verification skills used to build Grok Bot and cursor into a meta-skill that walks an agent through writing a good one for your own app.
  • Other skills she names on air: how and why for tracing system behavior, unslop for stripping AI writing patterns, and recall for collapsing the past-transcript workflow into one step. See skills-as-process. The two ports I read enumerate more: architect, arena, interrogate, and swarm in the pasevin port, plus babysit, reflect, create-verification-skill, and maintain-verification-skill in the ericlitman port.
  • The principle behind the small CLIs is “Build the Lever” (principle-build-the-lever): “build the tool that does it instead of doing it by hand,” because “a deterministic script turns ‘trust me’ into ‘run this’”. The deterministic part lives in a script. See determinism-extraction. Dr Eggbot, a bot that helps you build good bots, ships with pstack.

Shape and size

pstack is a large plugin. The portable-skills port reads it as roughly thirty-eight skills plus two Cursor-plugin agent definitions and a Cursor Rules file, and it enumerates 21 engineering principles such as principle-build-the-lever, principle-prove-it-works, and principle-type-system-discipline. Her Pt. 2 guide says the playbooks are conditionally loaded reference files inside poteto-mode rather than skills, and names 23 playbooks as of version 0.15.0. The counts move between versions, so treat them as scale, not precision.

Portability

Because it targets Cursor’s plugin API, several ports translate the Cursor-specific parts for Claude Code, Codex, and other harnesses.

Sources

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