A powerful meta-prompting, context engineering and spec-driven development system that enables agents to work for long periods of time autonomously without losing track of the big picture
GSD Pi is a command-line coding agent and project workflow system that plans, implements, verifies, and tracks software work through milestones, tasks, Git worktrees, and stored project notes. It is for developers who want structured, longer-running agent sessions using different model providers. The catalogue entries extend GSD Pi with skills and agents.
Skill Claude CodeCodex
Lint and format code. Auto-detects ESLint, Biome, Prettier, or language-native formatters and runs them with auto-fix. Reports remaining issues with actionable suggestions.
Skill Claude CodeCodex
Design-engineering principles for making interfaces feel polished. Use when building UI components or doing visual detail work — animations, hover states, shadows, borders, typography, micro-interactions. Triggers on "make it feel better", "feels off", stagger animations, border radius, optical alignment, font…
Skill Claude CodeCodex
Add agent-first observability — structured logs, health endpoints, failure-state persistence, explicit failure modes — so the next agent can diagnose problems unattended. Use when asked to "add logging", "add observability", "add metrics", "make this observable", or when building/refactoring a subsystem that runs…
Skill Claude CodeCodex
React and Next.js performance optimization guidelines from Vercel Engineering. This skill should be used when writing, reviewing, or refactoring React/Next.js code to ensure optimal performance patterns. Triggers on tasks involving React components, Next.js pages, data fetching, bundle optimization, or performance…
Skill Claude CodeCodex
Review code changes for security, performance, bugs, and quality. Reviews staged changes, unstaged changes, specific commits, or PR-ready diffs.
Skill Claude CodeCodex
Threat-model-driven security review of a change, feature, or subsystem. Runs a STRIDE-style pass over the actual code and produces a filing-ready report with severity, exploit scenario, and remediation. Use when asked to "security review", "threat model", "check for vulnerabilities", "audit for security", "secure…
Skill Claude CodeCodex
Package findings from a completed spike into a durable project-local skill that auto-loads on future similar work. Reads the latest .gsd/workflows/spikes/ dir, interviews the user on what's reusable, then writes .agents/skills/ /SKILL.md. Use when asked to "wrap up the spike", "package this as a skill", "make this…
Skill Claude CodeCodex
Test-driven development with red-green-refactor loops around vertical slices (tracer bullets), not horizontal layers. Use when asked to "use TDD", "write test-first", "red-green-refactor", "build this with tests", or when a feature has a clear observable contract. The discipline complement to the test/add-tests skills…
Skill Claude CodeCodex
UI/UX best practices for web interfaces. Use when reviewing animations, CSS, audio, typography, UX patterns, prefetching, or icon implementations. Covers 11 categories from animation principles to typography. Outputs file:line findings.
Skill Claude CodeCodex
Block completion claims until verification evidence has been produced in the current message. Use before marking a task/slice/milestone complete, before creating a commit or PR, before saying "it works" or "tests pass", and any time you are about to claim work is done. The rule is: evidence before claims, always …
Skill Claude CodeCodex
Review UI code for Web Interface Guidelines compliance. Use when asked to "review my UI", "check accessibility", "audit design", "review UX", or "check my site against best practices".
Skill Claude CodeCodex
Comprehensive web quality audit covering performance, accessibility, SEO, and best practices. Use when asked to "audit my site", "review web quality", "run lighthouse audit", "check page quality", or "optimize my website".
Skill Claude CodeCodex
Collaborative authoring workflow for proposals, technical specs, decision docs, READMEs, ADRs, and long-form prose that must work for fresh readers. Three stages: gather context, iterate on structure, reader-test for a stranger. Use when asked to "write the docs", "draft a proposal", "write a spec", "write an RFC"…
Skill Claude CodeCodex
Synthesize the current conversation into a milestone brief (PRD). Writes to M###-CONTEXT.md by default, or files a GitHub issue only with explicit user confirmation. Use when asked to "turn this into a PRD", "draft a milestone brief", "capture this context", "write it up", or when enough has been discussed to commit…
Skill Claude CodeCodex
Skill "{{SKILL_NAME}}" from open-gsd/gsd-pi, covering 1. {{first principle}}, 2. {{second principle}}, 3. {{third principle}}, domain knowledge and workflows.
Skill Claude CodeCodex
Skill "{{SKILL_NAME}}" from open-gsd/gsd-pi, covering step 1: {{first action}}, step 2: {{second action}} and step 3: {{third action}}.
At most 3 mods per repository are shown here, and a mod shipped inside a plugin is left to that plugin's page — the rest are on their repository pages: