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Agent skill

Posthog Hello World

by jeremylongshore in jeremylongshore/tons-of-skills-marketplace

Verify a minimal PostHog integration with one controlled event, one identified test user, and one feature-flag fallback.

MITAuto-check passedTesting & QA

Install Posthog Hello World

skills CLI
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill posthog-hello-world -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install jeremylongshore/tons-of-skills-marketplace posthog-hello-world --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/.curated/posthog-hello-world .claude/skills/posthog-hello-world && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
posthog-hello-world
GitHub stars
2.8k
Token cost
~1.5k tokens
SKILL.md length
277 words
Files
2 (incl. references)
Skills in repo
3,342
Repo updated
First seen
Licence
MIT

At a glance

Verify a minimal PostHog integration with one controlled event, one identified test user, and one feature-flag fallback.

  • Works in 4 steps: Capture Your First Event (Node.js) → Browser Hello World (posthog-js) → Python Hello World → …
  • Proving a new setup before broader instrumentation
  • SKILL.md covers Overview, Prerequisites, Instructions and Error Handling, plus 4 more sections
  • Calls curl; reaches us.i.posthog.com; needs NEXT_PUBLIC_POSTHOG_KEY

What it does

Posthog Hello World is an agent skill from jeremylongshore/tons-of-skills-marketplace. Verify a minimal PostHog integration with one controlled event, one identified test user, and one feature-flag fallback. Use when proving a new setup before broader instrumentation. Trigger with "PostHog smoke test", "verify PostHog setup", or "first PostHog event".

Its SKILL.md is about 1.5k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/official-docs.md`). Compatibility notes: Designed for Claude Code

It sits in Testing & QA, covering QA and bug reports. It works with PostHog. The repository describes itself as: Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com. The licence is MIT.

When your agent uses it

  • Proving a new setup before broader instrumentation
  • With PostHog smoke test
  • Verify PostHog setup
  • First PostHog event

Example prompts

  • “PostHog smoke test”
  • “verify PostHog setup”
  • “first PostHog event”
  • “/posthog-hello-world”

Requirements

  • Python 3
  • Node.js
  • A credential in NEXT_PUBLIC_POSTHOG_KEY
  • Compatibility (from SKILL.md): Designed for Claude Code
  • Pre-approved tools (allowed-tools): Read, Write, Edit

Workflow steps

4 steps, taken from the step headings in SKILL.md.

  1. Capture Your First Event (Node.js)
  2. Browser Hello World (posthog-js)
  3. Python Hello World
  4. Raw HTTP API (No SDK)

What it can do on your machine

Read from SKILL.md and the folder at commit cfae287. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Write
    • Edit

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • curl

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Hosts in commands or code, which the agent is likely to contact:

    • us.i.posthog.com

    Also links to:

    • posthog.com

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names these keys or tokens, usually read from environment variables:

    • NEXT_PUBLIC_POSTHOG_KEY

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

  • Compatibility

    Designed for Claude Code

    From compatibility in the SKILL.md frontmatter.

Context cost

Posthog Hello World loads about 1.5k tokens when it runs, and up to ~1.7k if it reads all its reference files. Until then it costs about 72 tokens; SKILL.md has 277 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~72
When it runs · the whole SKILL.md, loaded when a task matches
~1.5k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.7k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from jeremylongshore/tons-of-skills-marketplace at commit cfae287, republished under its MIT licence (© jeremylongshore). 277 words, ~1,524 tokens.

Download SKILL.mdSave it as .claude/skills/posthog-hello-world/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
posthog-hello-world
description
Verify a minimal PostHog integration with one controlled event, one identified test user, and one feature-flag fallback. Use when proving a new setup before broader instrumentation. Trigger with "PostHog smoke test", "verify PostHog setup", or "first PostHog event".
allowed-tools
Read, Write, Edit
compatibility
Designed for Claude Code
argument-hint
[project-path] [region]
version
1.14.0
license
MIT
author
Jeremy Longshore <jeremy@intentsolutions.io>
tags
saas, posthog, api, testing

PostHog Hello World

Overview

Minimal working examples demonstrating the three core PostHog operations: capturing events, identifying users, and evaluating feature flags. Covers both browser (posthog-js) and server (posthog-node) SDKs.

Prerequisites

  • Completed posthog-install-auth setup
  • Project API key (phc_...) configured
  • posthog-js and/or posthog-node installed

Instructions

Tool discipline

Use Read to inspect the relevant configuration and implementation before proposing changes. Use Write only for a new, explicitly requested artifact inside the target project. Use Edit for minimal changes to existing project files after the evidence pass.

Step 1: Capture Your First Event (Node.js)
typescript
// hello-posthog.ts
import { PostHog } from 'posthog-node';

const posthog = new PostHog(process.env.NEXT_PUBLIC_POSTHOG_KEY!, {
  host: 'https://us.i.posthog.com',
});

async function main() {
  // 1. Capture a custom event
  posthog.capture({
    distinctId: 'user-123',
    event: 'hello_posthog',
    properties: {
      greeting: 'Hello from posthog-node!',
      source: 'hello-world-skill',
      timestamp: new Date().toISOString(),
    },
  });
  console.log('Event captured: hello_posthog');

  // 2. Identify a user with properties
  posthog.identify({
    distinctId: 'user-123',
    properties: {
      email: 'dev@example.com',
      name: 'Dev User',
      plan: 'free',
    },
  });
  console.log('User identified: user-123');

  // 3. Check a feature flag
  const flagValue = await posthog.getFeatureFlag('my-feature-flag', 'user-123');
  console.log(`Feature flag "my-feature-flag": ${flagValue}`);

  // 4. Flush and shutdown (required in scripts/serverless)
  await posthog.shutdown();
  console.log('Done — check app.posthog.com Activity tab');
}

main().catch(console.error);
Step 2: Browser Hello World (posthog-js)
typescript
// In a React component or vanilla JS
import posthog from 'posthog-js';

// Initialize (call once at app startup)
posthog.init('phc_your_project_key', {
  api_host: 'https://us.i.posthog.com',
  loaded: () => console.log('PostHog loaded'),
});

// Capture a custom event
posthog.capture('button_clicked', {
  button_name: 'signup',
  page: window.location.pathname,
});

// Identify the user after login
posthog.identify('user-123', {
  email: 'user@example.com',
  plan: 'pro',
});

// Check a feature flag
if (posthog.isFeatureEnabled('new-checkout')) {
  console.log('New checkout flow is enabled');
}

// Associate user with a company (group analytics)
posthog.group('company', 'company-456', {
  name: 'Acme Corp',
  plan: 'enterprise',
});
Step 3: Python Hello World
python
import posthog

posthog.project_api_key = 'phc_your_project_key'
posthog.host = 'https://us.i.posthog.com'

# Capture event
posthog.capture('user-123', 'hello_posthog', {
    'greeting': 'Hello from Python!',
})

# Identify user
posthog.identify('user-123', {
    'email': 'dev@example.com',
    'plan': 'free',
})

# Feature flag
is_enabled = posthog.feature_enabled('my-flag', 'user-123')
print(f'Flag enabled: {is_enabled}')
Step 4: Raw HTTP API (No SDK)
bash
set -euo pipefail
# Capture one explicitly intended tutorial event through the current single-event endpoint.
curl -X POST 'https://us.i.posthog.com/i/v0/e/' \
  -H 'Content-Type: application/json' \
  -d '{
    "api_key": "phc_your_project_key",
    "event": "hello_posthog",
    "distinct_id": "user-123",
    "properties": {
      "greeting": "Hello from curl!"
    }
  }'

# Batch capture multiple events
curl -X POST 'https://us.i.posthog.com/batch/' \
  -H 'Content-Type: application/json' \
  -d '{
    "api_key": "phc_your_project_key",
    "batch": [
      {"event": "page_viewed", "distinct_id": "user-123", "properties": {"page": "/home"}},
      {"event": "button_clicked", "distinct_id": "user-123", "properties": {"button": "cta"}}
    ]
  }'

Error Handling

ErrorCauseSolution
Events not in dashboardNot flushedCall await posthog.shutdown() or posthog.flush()
posthog.init silently failsWrong API hostUse us.i.posthog.com (not app.posthog.com)
Feature flag returns undefinedFlag not created yetCreate flag in PostHog dashboard first
identify not linkingDifferent distinct_idFrontend and backend must use the same distinct_id
Python events missingNo flush before exitposthog.shutdown() or posthog.flush() at end

Output

  • Working event capture in PostHog Activity tab
  • User identified with properties in Persons view
  • Feature flag evaluation result logged
  • Console output confirming each operation

Examples

In a disposable test environment, initialize the official SDK with the project token and selected region, capture one namespaced smoke event, verify its arrival in PostHog, and exercise a flag with an explicit fallback. Record the test distinct ID so the evidence can be removed or filtered later.

Resources

See official PostHog references for current authority and verification boundaries.

Next Steps

Proceed to posthog-local-dev-loop for development workflow setup.

© jeremylongshore, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file (references) in skills/.curated/posthog-hello-world of jeremylongshore/tons-of-skills-marketplace.

  • SKILL.md
  • references/official-docs.md

Open the folder on GitHubat commit cfae287

Compare with similar skills

Posthog Hello World next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Posthog Hello World compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Posthog Hello World this skilljeremylongshore/tons-of-skills-marketplace2.8k—~1.5kAutomated safety check: PassMIT
Extending Hobby Smoke TestsPostHog/posthog40k—~1.5kAutomated safety check: PassCustom licence
Reproduce Chat Statesdifferent-ai/openwork24k—~673Automated safety check: PassCustom licence
Dynamo Jira TicketDynamoDS/Dynamo2k—~1.1kAutomated safety check: PassApache-2.0
Moav E2EMotherofallVPNs/MoaV449—~1.9kAutomated safety check: NotesMIT
Creating A Coral TaskHuman-Agent-Society/CORAL1.1k—~2.2kAutomated safety check: PassApache-2.0

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Works with

Categories

Questions about Posthog Hello World

What does Posthog Hello World do?

Verify a minimal PostHog integration with one controlled event, one identified test user, and one feature-flag fallback. Posthog Hello World is an agent skill from jeremylongshore/tons-of-skills-marketplace. Verify a minimal PostHog integration with one controlled event, one identified test user, and one feature-flag fallback.

When should I use Posthog Hello World?

Posthog Hello World fits situations like: proving a new setup before broader instrumentation; with PostHog smoke test; verify PostHog setup; first PostHog event.

How do I install Posthog Hello World in Claude Code?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill posthog-hello-world -a claude-code`. Or copy the skill folder (skills/.curated/posthog-hello-world in jeremylongshore/tons-of-skills-marketplace) into .claude/skills/posthog-hello-world in your project. Claude Code loads it when a task matches its description.

How do I install Posthog Hello World in Codex?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill posthog-hello-world -a codex`. Or copy the skill folder (skills/.curated/posthog-hello-world in jeremylongshore/tons-of-skills-marketplace) into .agents/skills/posthog-hello-world in your project. Codex loads it when a task matches its description.

Can I use Posthog Hello World in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill posthog-hello-world -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/posthog-hello-world, .gemini/skills/posthog-hello-world, .github/skills/posthog-hello-world and .opencode/skills/posthog-hello-world in your project.

What does Posthog Hello World need to run?

Going by SKILL.md and its folder, Posthog Hello World needs the command-line tools its instructions call (curl) and credentials named NEXT_PUBLIC_POSTHOG_KEY. Our summary lists: Python 3; Node.js; A credential in NEXT_PUBLIC_POSTHOG_KEY. Its frontmatter pre-approves these tools: Read, Write, Edit. Compatibility (from SKILL.md): Designed for Claude Code.

Does Posthog Hello World access the network?

SKILL.md names 2 domains. In commands or code: us.i.posthog.com; the agent is likely to contact it when it follows the instructions. As links in the text: posthog.com. This is read from the text; nothing was executed.

Is Posthog Hello World safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Posthog Hello World use?

Posthog Hello World is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Posthog Hello World use?

About 1.5k tokens (SKILL.md is roughly 6.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 204 tokens, read only when the agent opens those files.

What are the alternatives to Posthog Hello World?

Skills that share tags, products or a category with Posthog Hello World: Extending Hobby Smoke Tests (PostHog/posthog, 40k stars), Reproduce Chat States (different-ai/openwork, 24k stars), Dynamo Jira Ticket (DynamoDS/Dynamo, 2k stars) and Moav E2E (MotherofallVPNs/MoaV, 449 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Posthog Hello World?

jeremylongshore (a GitHub user) maintains it in jeremylongshore/tons-of-skills-marketplace, which has 2,827 GitHub stars. The repository holds 3,342 skills in this directory. The repository was last updated on October 10, 2026.

Source: jeremylongshore/tons-of-skills-marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.