setup-web-tests
Set up Python test environment in Claude Code for web where flox is unavailable. Use when you need to run backend tests and `uv sync` fails due to Python version mismatch.
35.56k repo starsObserved in 3 repos
Development
Development skills
Browse reusable Agent Skills, each with a clear purpose and practical guidance.
using-kea-disposables
Use when adding timers (`setInterval`, `setTimeout`), event listeners (`window.addEventListener`, `document.addEventListener`, `MediaQueryList.addEventListener`), or any other resource that needs cleanup inside a kea logic. Every logic has `cache.disposables.add(setup, key?, options?)` and `cache.disposables.dispose(key)` available via the globally registered `disposablesPlugin` (`frontend/src/kea-disposables.ts`). Replaces the bare `cache.foo = setInterval(...)` + `beforeUnmount: clearInterval(cache.foo)` pattern and auto-pauses background work when the tab is hidden.
35.56k repo starsObserved in 3 repos
Development
visualizing-change-over-time
Helps PostHog engineers and agents pick the right chart when a request is about visualizing change over time, before/after comparisons, or period-over-period movement while building UI with @posthog/quill-charts (dashboards, reports, the mcp_analytics frontend, custom visualizations). Use when a user asks how something "changed", "moved", "grew", "dropped", "improved", or "regressed" between two points or periods, or mentions "before/after", "period over period", "week over week", "delta", "slope graph", "slopegraph", or comparing many series across two snapshots. Surfaces both the `SlopeChart` quill component and the native `ChartDisplayType.SlopeGraph` insight display as options.
35.56k repo starsObserved in 3 repos
Development
writing-clickhouse-queries
Guide for writing performant ClickHouse queries in PostHog product code. Use when writing HogQL query runners, designing a ClickHouse table for a new product, adding materialized columns or skip indexes, or choosing a row ID format. For optimizing an existing query that is already too slow, use `/optimizing-clickhouse-and-hogql-queries` instead.
35.56k repo starsObserved in 3 repos
Development
adding-ingestion-warnings
How to add a new ingestion warning type to the event ingestion pipeline. Use when emitting a new warning from nodejs ingestion code (emitIngestionWarning, captureIngestionWarning, pipeline `warnings` arrays, `drop()` with warnings), when adding a warning type, category, or severity, or when a typecheck error says a string is not assignable to IngestionWarningType. Covers the INGESTION_WARNING_TYPES registry (the single source of truth for type, category, and severity), the details-key conventions that ClickHouse v2 materializes into columns, debouncing, and the downstream surfaces to keep in sync (v1 UI map, docs, v2 API).
35.56k repo starsObserved in 2 repos
Development
writing-kea-logics
Guide for writing or reviewing PostHog kea logic files (`*Logic.ts` / `*Logic.tsx`). Use when creating a new logic, adding actions/reducers/selectors/listeners/loaders/forms/router bindings, choosing between reducer vs selector vs cache, deciding between listeners and `kea-subscriptions`, wiring React with `useValues`/`useActions`/`BindLogic`, or onboarding to kea conventions. Read keajs.org for upstream API; this skill captures PostHog-specific conventions and idioms.
35.56k repo starsObserved in 2 repos
Development
utm-submit
Submit the current UTM change as a pull request to github.com/utmapp/UTM. Ensures /utm-review has run, then either updates an existing PR (squashing each new edit into the commit that owns it and force-pushing) or opens a new PR (gathering issue links and a human-testing attestation). Use this when the user wants to submit, open, update, or push a UTM pull request, or runs /utm-submit.
34.69k repo starsObserved in 1 repos
Development
add-changeset
Create SWC changeset files for pull requests. Use when asked to add a changeset, prepare release notes, decide patch/minor/major bumps, or enumerate changed Rust crates for an SWC PR; the skill requires every publishable Rust crate with a breaking change or a runtime dependency breaking change to be listed as major, every other changed publishable Rust crate to be listed as patch or minor, and swc_core to be listed as at least patch for Rust crate changes.
34.25k repo starsObserved in 1 repos
Development
repair-pr
One-shot repair workflow for SWC pull requests. Use when asked to repair a PR by resolving merge conflicts, applying unresolved actionable reviews from chatgpt-codex-connector[bot], resolving those review threads, fixing failing CI, committing the repair work in coherent chunks, and pushing once at the end.
34.25k repo starsObserved in 1 repos
Development
Bazel usage
Instructions that **MUST** be followed when using Bazel or Bazelisk to build, test, and debug in the Carbon repository.
33.92k repo starsObserved in 1 repos
Development