pstack
Lauren Tan's pstack is an opinionated Cursor skill stack that improves agent outcomes. This is a port for Claude Code, Codex, Pi, GitHub Copilot, Muse, and other agent harnesses. It tracks upstream and also carries named policy forks, each declared in tools/forks.json.
Tell poteto-mode your goal and it will invoke the correct workflow for the task. It keeps your code concise, simple and verified.
For concurrency bugs and invariants that tests cannot reach, /create-formal-verification-skill picks the riskiest property in your code, verifies it with a tool that fits, and leaves a project skill the next agent reruns. The separate agent-formal-verify plugin goes deeper on the method, with guided TLA+ model checking, Lean proofs, and Kani for Rust.
Built for Claude Code
This port translates upstream's Cursor skills for Claude Code before installation. Upstream's Claude Code install asks agents to translate Cursor names at runtime, using extra tokens and relying on them to apply the mapping correctly. This port also adds a SessionStart hook that routes tasks to poteto-mode.
Install
Claude Code
Run in Claude Code 2.1.292 or later:
/plugin marketplace add michael-denyer/pstack-claude
/plugin install pstack@pstack-claude
Claude Code leaves auto-update off for third-party marketplaces, so pstack stays on the version you installed. To turn it on, run /plugin, open the Marketplaces tab, select pstack-claude, and choose Enable auto-update. To update once by hand, run claude plugin update pstack@pstack-claude.
Codex
Run in your terminal:
codex plugin marketplace add michael-denyer/pstack-claude codex plugin add pstack@pstack-claude
Pi
Run in your terminal:
pi install git:github.com/michael-denyer/pstack-claude
The package loads the skills and the pstack Pi extension, which adds the subagent, question, and wake-up tools the skills use, plus /loop and the routing instruction. Invoke a skill with /skill:<name>.
GitHub Copilot
Run in your terminal:
copilot plugin marketplace add michael-denyer/pstack-claude copilot plugin install pstack@pstack-claude
This installs pstack for the Copilot CLI and the GitHub Copilot app, which share ~/.copilot. Start a new session afterwards. Copilot ships no default pstack models, so the first skill that needs one runs setup-pstack to pick from the models your account lists, and later sessions reuse that choice.
The Copilot build is tested on Copilot CLI 1.0.87 through 1.0.92. On those versions the routing hook's context reaches the session alongside other plugins' session-start context. If a later version keeps only one plugin's context, setup-pstack offers a standing instruction for ~/.copilot/copilot-instructions.md instead. On 1.0.92, once the CLI caches its computer-use experiment assignment, copilot -p sessions list no plugin skills and a skill call returns "Skill not found". Interactive sessions, the hooks, and the agents are unaffected.
Muse
Run in your terminal:
git clone https://github.com/michael-denyer/pstack-claude
cd pstack-claude
muse plugins install ./plugins/pstack
muse plugins approve pstackThe first command installs the native Muse plugin bundle. The second approves its SessionStart hook and agent definitions, which Muse runs only after approval. Start a new session afterwards. Invoke a skill with /<name> (for example /poteto-mode), which Muse lists for each user-invocable skill.
Other harnesses
OpenCode (the CLI and the desktop app), Gemini CLI, Prime Agent, and skills-only Codex installs read skills from ~/.agents/skills/. Run in your terminal:
git clone https://github.com/michael-denyer/pstack-claude cd pstack-claude mkdir -p ~/.agents/skills for s in plugins/pstack/skills/*/; do target=~/.agents/skills/"$(basename "$s")" test -e "$target" || test -L "$target" || ln -s "$(pwd)/$s" "$target" done
To update, run git pull in the clone, then run the for loop again to link skills added since the last run. These installs have no routing hook, so ask for poteto-mode by name or add a standing instruction to the harness's instruction file. See shared installation for per-harness notes and uninstalling.
Configure
pstack routes tasks to poteto-mode automatically. At session start, a hook injects an instruction that points the agent at it: the plugin's hook on Claude Code, Codex, GitHub Copilot, and Muse, and the pstack extension on Pi. Codex runs the hook only after you trust it through /hooks, and Muse only after muse plugins approve pstack. Other harnesses have no hook.
Run setup-pstack to turn automatic routing on or off, change model defaults, or set a reasoning effort per role (arena runners: opus @xhigh, fable @max).
Getting started
Use poteto-mode to fix the search filter resetting when I change pages.
For a bug, it reproduces the failure, uses how and why to investigate, delegates the fix, then reruns the failing case. If the fix crosses a function boundary, it brings in architect before implementation. You receive the fix and the failing and passing evidence.
Other playbooks cover planning, features, refactoring, performance issues, investigations, prototypes, PR maintenance, shipping, and longer projects.
Details
Data handling
pstack has no server or telemetry. Anything its skills ask your agent to read, including session transcripts, goes to your model provider. Scripts run locally, and PR tools use your GitHub CLI login.
Contributing
Thanks for helping make this port better. Bug reports, documentation fixes, and runtime improvements are welcome. See CONTRIBUTING.md for the checks and where your change belongs. Report vulnerabilities privately as described in SECURITY.md.
To support maintenance of this port, buy the maintainer a coffee.
License
This port, including its modifications and additions, is also MIT-licensed, © 2026 Michael Denyer. Original pstack © 2026 Lauren Tan; imported cursor-team-kit and thermos skills © 2026 Cursor. See LICENSE-cursor-team-kit, LICENSE-thermos, and NOTICE.md.
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