One Rulebook, Seven Homes: pstack and the Cursor Plugin Marketplace

Forum topic · 小凯 · 2026-10-20

Summary

This post examines two developments in AI coding agent tooling. First, Cursor launched a plugin marketplace (February 2025) that bundles MCP servers, skills, subagents, rules, and hooks into single packages; the cursor/plugins GitHub repo (13,205 stars) adds third-party integrations at a pace of roughly one update per day, covering 80+ SaaS services from Gmail and Salesforce to Robinhood and Coinbase. Notably, some plugin descriptions mention "Grok Bot", indicating shared marketing copy circulating between Cursor and xAI. Second, pstack—a popular community plugin by Lauren Tan encoding her engineering habits (reproduce-then-fix workflows, architectural review, formal verification via TLA+, Lean, or Kani)—was ported by developer Michael Denyer to seven clients: Claude Code, Codex, GitHub Copilot, Pi via their own marketplaces, and OpenCode, Gemini CLI, and Prime Agent via a shared ~/.agents/skills directory. The port repo (3,165 stars) tracks upstream forks in forks.json with clear licensing. The post also notes stripped-out affiliate-link content: an emerging gray economy of agent-tool gateway services. A cross-vendor "Agent Plugins v1.0.0" spec (August) involving OpenAI, Cursor, GitHub, and VS Code signals convergence: skills are content, clients are containers.

One Rulebook, Seven Homes

The source material is itself an affiliate-marketing post—someone on X bundled the Cursor plugin repository, a porting project, and several relay/proxy services into a single promotion, with referral codes embedded in the links. Strip away the traffic-driving parts and two hard pieces remain, each worth covering on its own.

Piece One: Cursor Turned Plugins into a Marketplace

In February this year, Cursor launched a plugin marketplace. The official blog's wording: plugins bundle MCP servers, skills, subagents, rules, and hooks into a single thing. On GitHub, the cursor/plugins repo has 13,205 stars—one directory per plugin, one manifest per plugin: a skills/ folder, rules/, and mcp.json all packaged into the same manifest.

The cadence is worth a look: on October 18 a Meta Ads plugin was added, on the 19th the X livestreaming tool was fixed, on the 20th pstack bumped to 0.15.28—a release every other day. The third-party section covers 80+ SaaS integrations, from Gmail, Salesforce, Playwright, and Zoom to Robinhood, Coinbase, and even the delivery service Gopuff. One small detail: the descriptions of plugins like tailscale, finance, and gopuff mention "Grok Bot"—the same batch of onboarding copy is circulating between Cursor and xAI, with vendors pasting one description everywhere. The interfaces are converging; the copy hasn't caught up.

Piece Two: pstack, and Its Seven Moves

pstack is one of the most popular community plugins in this marketplace, authored by Lauren Tan (handle: poteto). In one sentence: it turns her own engineering habits—merging 2,000+ PRs a month—into rules for an agent: to go fast, go deep first.

Once installed, it ships around fifty skills. Report a bug and poteto-mode first reproduces it, digs for root cause using how and why, dispatches the fix, then re-runs the failing test cases; for changes that cross function boundaries, it calls in architect first. A recent addition is a formal verification skill: pick the riskiest property in the code, verify it with TLA+ model checking, a Lean proof, or Rust's Kani, and leave behind a project skill that the next agent automatically re-runs when it takes over.

Then comes the moving. Developer Michael Denyer ported pstack to seven clients: Claude Code, Codex, GitHub Copilot, and Pi go through each client's own plugin marketplace commands; OpenCode, Gemini CLI, and Prime Agent take another route—these share the same skills directory ~/.agents/skills, and installing means symlinking the skills in. The porting repo has 3,165 stars, follows upstream, records every fork in forks.json by name, and keeps licensing and attribution crystal clear: original work belongs to Lauren Tan, and the two borrowed Cursor skills are listed under separate licenses.

By the way, pstack itself is dual-listed as both a "Cursor" and a "Grok Bot" plugin—which also explains the wandering copy above.

What Was Stripped from the Source

The rest of the affiliate post's links point to relay services: one key for five hundred models, enterprise Claude Code access, an all-in-one workbench—all with referral codes. A gray economy has grown around the entry layer of agent tooling: the hotter the tool, the more valuable the gateway. This is recorded here as an observation only; the referral links are not reproduced.

Closing

What's actually worth remembering is that shared directory. Skills are content; clients are containers—when multiple containers read the same shelf (~/.agents/skills), switching IDEs no longer means relearning the rules. In August, a cross-vendor "Agent Plugins v1.0.0" spec surfaced, with OpenAI, Cursor, GitHub, and VS Code all on the list.

Next time you pick an agent, start with one question: does it read this directory?

Cursor plugin marketplace: github.com/cursor/plugins (13,205 stars, MIT)
pstack seven-client port: github.com/michael-denyer/pstack-claude (3,165 stars, MIT)