Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add PostHog/skills --skill integration-javascript_webgit clone --depth 1 https://github.com/PostHog/skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/posthog/skills/integration-javascript_web)<a href="https://agentmods.dev/skills/posthog/skills/integration-javascript_web"><img src="https://agentmods.dev/badge/skills/posthog/skills/integration-javascript_web/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/posthog/skills/integration-javascript_web"><img src="https://agentmods.dev/badge/skills/posthog/skills/integration-javascript_web.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00020 | $0.00762 |
| Opus 5.5 | $0.00008 | $0.00305 |
| Sonnet 5.5 | $0.00004 | $0.00152 |
| Haiku 4.5 | $0.00002 | $0.00076 |
Grade A, and why
integration-javascript_web scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 63 lines — stays where its author put it; the contents beside it link to each section on GitHub.
PostHog integration for JavaScript Web
This skill helps you add PostHog analytics to JavaScript Web applications.
Workflow
Follow these steps in order to complete the integration:
basic-integration-1.0-begin.md- PostHog Setup - Begin ← Start herebasic-integration-1.1-edit.md- PostHog Setup - Editbasic-integration-1.2-revise.md- PostHog Setup - Revisebasic-integration-1.3-conclude.md- PostHog Setup - Conclusion
Reference files
references/js.md- JavaScript web - docsreferences/posthog-js.md- PostHog JavaScript web SDKreferences/identify-users.md- Identify users - docsreferences/basic-integration-1.0-begin.md- PostHog setup - beginreferences/basic-integration-1.1-edit.md- PostHog setup - editreferences/basic-integration-1.2-revise.md- PostHog setup - revisereferences/basic-integration-1.3-conclude.md- PostHog setup - conclusion
The example project shows the target implementation pattern. Consult the documentation for API details.
Key principles
- Environment variables: Always use environment variables for PostHog keys. Never hardcode them.
- Minimal changes: Add PostHog code alongside existing integrations. Don't replace or restructure existing code.
- Match the example: Your implementation should follow the example project's patterns as closely as possible.
Framework guidelines
- Remember that source code is available in the node_modules directory
- Check package.json for type checking or build scripts to validate changes
- posthog-js is the JavaScript SDK package name
- posthog.init() MUST be called before any other PostHog methods (capture, identify, etc.)
- posthog-js is browser-only — do NOT import it in Node.js or server-side contexts (use posthog-node instead)
- Autocapture is ON by default with posthog-js (tracks clicks, form submissions, pageviews). Do NOT disable autocapture unless the user explicitly requests it.
- NEVER send PII in posthog.capture() event properties — no emails, full names, phone numbers, physical addresses, IP addresses, or user-generated content
- PII belongs in posthog.identify() person properties (email, name, role), NOT in capture() event properties
- Call posthog.identify(userId, { email, name, role }) on login AND on page refresh if the user is already logged in
- Call posthog.reset() on logout to unlink future events from the current user
- For SPAs without a framework router, capture pageviews with posthog.capture($pageview) or use the capture_pageview history_change option in init for History API routing
What ships with it
7 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2mo ago First seen · 63 lines · 20 tokens per session scan A f69dff7a81f4
integration-javascript_web is a skill published in the GitHub repository PostHog/skills (78 stars, last pushed today), licensed MIT. It adds 20 tokens to every session and 762 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
integration-javascript_web compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| integration-javascript_webPostHog/skills | Skill | 78 | today | MIT | A | 20 | Claude Code |
| imagegenopenai/codex | Skill | 134k | today | Apache-2.0 | A | 113 | Codex |
| local-ai-agentsmicrosoft/ai-agents-for-beginners | Skill | 79k | today | MIT | A | 200 | Claude Code, Codex |
| playwright-climicrosoft/playwright | Skill | 99k | today | Apache-2.0 | A | 19 | Claude Code |
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| next-cache-components-adoptionvercel/next.js | Skill | 143k | today | MIT | A | 95 | Claude Code |
| chat-pet-sprite-creationmicrosoft/vscode | Skill | 195k | today | MIT | A | 53 | Claude Code, Codex |