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using-redis-token-buckets
by PostHog
'Use when adding a bucket-like rate limit backed by Redis: a per-caller budget with burst capacity and continuous refill, a refund path for requests that did no work, or a limit whose Retry-After must be a real wait rather than a window edge. posthog/token_bucket.py provides an atomic Lua token bucket (consume, refund, peek) over posthog.redis.get_client(). Choose it over DRF SimpleRateThrottle/fixed-window cache counters when boundary bursts, top-of-window lockouts, or charge-then-refund semantics matter. Trigger terms: token bucket, rate limit, burst, refill, quota, Retry-After, fixed window, throttle.'
maintaining-python-tests
by PostHog
Maintains existing pytest and Django test suites without weakening correctness. Use when asked to reduce Python test runtime or CI work, investigate slow pytest families, remove stale migration tests, consolidate repeated setup, improve Python test ownership, or measure whether a test optimization worked after merge. Ranks work by measured cost, applies the writing-tests value gate to existing coverage, preserves distinct behavior cases, validates isolation after shared-fixture changes, and separates testcase work from pytest-suite wall time. For an intermittent failure, use fixing-flaky-tests instead.
run-posthog
by PostHog
Start, inspect, and drive the PostHog dev stack. Use for /run and /verify on this repo — when asked to launch PostHog, check whether the stack is healthy, inspect a running process, or verify a UI change against the live app.
triaging-web-analytics-support
by PostHog
Triage web analytics support tickets end to end: enumerate open tickets from the in-app conversations product and their Zendesk mirrors, classify each into a diagnostic shape (frontend crash, "two numbers don't match", traffic count drop, tracker not loading / undercounting vs a competitor, ad-platform integration error, channel type misclassification), run the matching playbook, and produce reply drafts plus fix PRs where warranted. Use when asked to triage the web analytics support channel, investigate a web analytics Zendesk or conversations ticket, or explain metric discrepancies a customer reported. Internal-only: queries cross-customer support and usage data; never copy customer names or their traffic numbers into public artifacts (PRs, issues, commits).
depot-github-runners
by PostHog
Configures Depot-managed GitHub Actions runners as a drop-in replacement for GitHub-hosted runners. Use when setting up or migrating GitHub Actions workflows to use Depot runners, choosing runner sizes (CPU/RAM), configuring runs-on labels, setting up ARM or Windows or macOS runners, troubleshooting GitHub Actions runner issues, configuring egress filtering, using Depot Cache with GitHub Actions, or running Dagger/Dependabot on Depot runners. Also use when the user mentions depot-ubuntu, depot-windows, depot-macos runner labels, or asks about faster/cheaper GitHub Actions runners. Not for Depot CI, the separate engine that reads .depot/workflows/ — that is the depot-ci skill.
auditing-llm-gateway-parity
by PostHog
Audits services/llm-gateway against PostHog/ai-gateway and updates services/llm-gateway/PARITY.md from current implementation evidence. Use when either gateway changes auth, attribution, billing, endpoints, providers, models, routing, or metadata; when reviewing a Python gateway change; or when asked to refresh, verify, or report gateway parity. This skill updates the parity record but does not migrate callers.
hogli
by PostHog
PostHog developer CLI and repo tooling reference. Use when the user mentions hogli, asks about repo CLI tools, bin scripts, Makefiles, how to run/build/test/lint, or any dev environment commands.
managing-github-actions-secrets
by PostHog
Creates and updates GitHub Actions secrets for PostHog workflows. Use when adding a new CI secret, rotating an existing secret, wiring a workflow to an API token, package registry credential, deploy key, or any value referenced via ${{ secrets.* }} in .github/workflows/.
querying-local-postgres
by PostHog
Run read-only SQL against the local Postgres app database (SELECT, EXPLAIN, EXPLAIN ANALYZE on SELECT). Default local URL postgres://posthog:posthog@localhost:5432/posthog; else DATABASE_URL. Use when querying the local DB, inspecting tables, debugging data, or analyzing query plans. Mutations are strictly forbidden.
fixing-flaky-tests
by PostHog
Guides an agent through reproducing, root-causing, fixing, and validating flaky tests in the PostHog monorepo. Use when a test fails intermittently in CI but passes on rerun or locally, when hogli ci:insights or the debugging-ci-failures skill classifies a failure as a flaky test, when given a GitHub Actions URL for a flaky job, when asked to check Trunk Flaky Tests for a test, PR, or master, or when asked to deflake, stabilize, or fix a flaky Jest, pytest, or Playwright test. Core discipline: reproduce locally before changing anything, fix the root cause (never mask it with sleeps, retries, or bigger timeouts), and prove the fix with an N-run validation loop sized to the observed failure rate. Stabilizing is not the only valid outcome — the skill also gates whether the test should exist, so deleting a test that catches nothing real, or re-leveling one that flakes because of the level it runs at, are first-class endings.
qa-frontend
by PostHog
Internal PostHog developer frontend/browser QA skill. Use only when a PostHog developer explicitly asks to run frontend QA, browser-test a PR, verify a UI flow against the local PostHog stack, use qa-frontend, or QA current frontend changes with browser/runtime evidence. Do not use for generic code review, PR review, "check my changes", CI debugging, or security audit; use qa-team, debugging-ci-failures, or security-audit instead. Runs in PR mode or local mode, plans adaptive browser and visual checks, drives browser MCP/tooling such as Playwright MCP or Chrome DevTools MCP, captures evidence, and applies only approved/narrow fixes.
debugging-ci-failures
by PostHog
Debugs failing GitHub Actions CI runs for PostHog PRs, commits, and branches, and answers broad CI-health questions ("is CI red?", "is master green today?", "what's broken right now?"). Use when the user asks why CI is red, asks for the current CI or master status, or mentions a failing check, GitHub Actions run, Depot runner, Depot CI run, workflow, job, shard, merge queue kick, flaky test, lint failure, typecheck failure, snapshot diff, migration check, generated types drift, or skills build failure. Interactive runs start with the hogli ci:insights digest (cross-run CI history from engineering analytics), then use read-only inspection, failure classification, the smallest local reproduction with hogli, and safe reporting without rerunning CI or posting to GitHub. Running unattended as the "Master-red diagnosis" workflow: see references/master-red-incident.md for its sandbox-compatible first step.
writing-code-comments
by PostHog
Gates whether a code comment should exist and forces the ones that stay to explain why, not what. Use ALWAYS before writing or editing a comment in any language (Python, TypeScript, Go, Rust, SQL), and when reviewing a diff that adds comments. Removes the comment types that clutter the codebase: narration that restates the code, change-history and chat-context notes ("previously did X", "per PR #123", "AI:"), perishable measurements and current-state stamps ("~20 min build", "currently", "today"), commented-out code, and redundant docstrings. Keeps the ones that earn their place: a non-obvious why, a warning about a non-local consequence, a pointer to context a future reader can't reconstruct. Not for user-facing copy (see /writing-user-facing-copy) or commit messages.
writing-skills
by PostHog
'Guide for writing PostHog agent skills — job-to-be-done templates that teach agents how to use MCP tools to achieve a goal. Use when adding new product functionality that agents should know how to work with, creating a new skill, or updating existing skills in products/*/skills/.'
stacking-prs
by PostHog
Create and manage GitHub native Stacked PRs in this repo with the gh stack CLI. Use when asked to stack PRs, split a large change into a stack, add a layer to a stack, restack or rebase a stack, adopt existing branches or PRs into a stack, check out someone else's stack, or land a stack. Covers creating and submitting stacks (draft-first), cascade rebases with gh stack sync, and landing one through the Trunk merge queue via /merging-prs — whole-stack via /trunk merge on the top layer, or bottom-first — never gh stack merge.
placing-product-frontend-code
by PostHog
Decide which tree a frontend file belongs in — products/<name>/frontend/ or frontend/src/scenes/<name>/ — and explain why the boundary is real rather than stylistic. Use when adding a new scene, component, or logic file for a product; when creating a new directory under frontend/src/scenes/; when a product has UI in both trees and you need to know which side to extend; or when moving a scene into its product. Covers the merge-queue lane cost of the split, the measurement showing a dependency graph cannot substitute for the path signal, and a report script that shows how far each product's move has gone.
trigger-getting-started
by triggerdotdev
Bootstrap Trigger.dev into an existing project from scratch: authenticate the CLI, install @trigger.dev/sdk and @trigger.dev/build, write trigger.config.ts with the project ref and task dirs, scaffold a /trigger directory with a first task, wire tsconfig and .gitignore, set TRIGGER_SECRET_KEY, and run the dev server. Load this when a project has no trigger.config.ts yet and the user asks to "add Trigger.dev", "set up Trigger.dev", "initialize Trigger.dev", or get a first task running, including in a monorepo. Once the project is set up and you are writing task code, switch to the trigger-authoring-tasks skill.
setting-up-devbox
by PostHog
Starts, connects to, and troubleshoots a PostHog devbox, a remote Coder workspace for PostHog development that can also run the full stack, through hogli devbox:* commands. Use when asked to spin up or resume a devbox, open a shell or editor on it, run a command on it, mirror a local checkout to it (devbox:sync), run the PostHog app on it and share a link, clone, update, share, or free disk on a devbox, store gh or Claude Code tokens for it, or diagnose a failing devbox command (tailnet, DNS, Coder CLI version, SSH). Not for running the stack on the local machine or for changing the Coder template in posthog-cloud-infra.
adding-project-secret-api-key-auth
by PostHog
'How to gate a PostHog API endpoint with project secret API key (PSAK) auth — a project-scoped, user-less service credential. Use when adding PSAK support to a viewset action, allowing a new scope for PSAKs, handling synthetic users (ProjectSecretAPIKeyUser), or choosing PSAK-aware rate throttles. Trigger terms: PSAK, ProjectSecretAPIKey, project secret API key, phs_ token, service auth, programmatic endpoint auth.'
running-ci-preflight
by PostHog
Catch the deterministic CI failures reachable from your diff before pushing, with hogli ci:preflight. Use when the pre-push hook blocks a push, before reporting a task done, or after editing Python, serializers, migrations, workflows, or dependency manifests — to avoid burning a CI matrix on a failure you could catch locally (formatting, lint, broken lockfiles, OpenAPI drift, migration conflict, stale branch). Trigger terms: ci:preflight, preflight, pre-push checks, pre-push hook failed, "will this break CI".
extending-hobby-smoke-tests
by PostHog
Design, extend, review, or debug PostHog Hobby end-to-end smoke tests in bin/hobby-ci.py and .github/workflows/ci-hobby.yml. Use when adding an ingestion round trip, deciding whether a product belongs in Hobby CI, changing the CI Hobby service topology or API-key scopes, or diagnosing a smoke test that captures data but cannot query it.
using-kea-disposables
by PostHog
'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 from the kea-disposables package. Replaces the bare cache.foo = setInterval(...) + beforeUnmount: clearInterval(cache.foo) pattern and auto-pauses background work when the tab is hidden.'
clickhouse-migrations
by PostHog
ClickHouse migration patterns and rules. Use when creating or modifying ClickHouse migrations.
gws-admin-reports
by googleworkspace
"Google Workspace Admin SDK: Audit logs and usage reports."