Simulate Returning User Agent Skill

> Send synthetic single-session multi-page traffic to a URL and confirm PostHog $pageview events fire across page views. Use when verifying that cookies persist correctly, that the same distinct_id is reused across navigations, or when debugging session-stitching issues.

496 tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

690

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/PostHog/posthog --skill simulate-returning-user

The instruction itself

4 sections, as written by the author

Simulate returning-user traffic

Drives a single browser context across N page views (cookies and localStorage

persist), navigating between pages and reporting which PostHog events fired.

This matches the behavior of a single visitor browsing multiple pages on the

same site.

When to use

Confirm that PostHog reuses the same distinct_id across page views in a

session (no fresh anonymous IDs per page).

Confirm $pageview fires on every page view, not just the first.
Reproduce "session not stitching" or "events split across multiple users"

reports.

How to invoke

Call the simulate_returning_user MCP tool with:

url (required) — the page to visit each iteration.
page_views (default 3) — number of page views in the session.
interval (default 5.0) — seconds between page views.
posthog_host (default https://us.i.posthog.com).

To exercise multi-page navigation, call the tool once per URL — the cookies

won't carry across calls (each call is a separate Playwright context). For

true multi-page browsing within one session, edit the URL list passed to the

underlying CLI: traffic-sim returning-user --url A --url B --url C.

Interpreting the result

The structured response shape matches simulate_new_user. Key signals:

verified: true and pageviews >= page_views — the session works.
Same distinct_id across all pageviews (visible in PostHog UI under the

run_id query param) — session stitching works.

Different distinct_id per visit — likely a cookie domain or

storage-permissions issue. Inspect the raw posthog_requests for $session_id

values to diagnose.

Other skills for the same job

different authors, same section of the catalogue

Protocolsio Integration

by christophacham

×4

Integration with protocols.io API for managing scientific protocols. This skill should be used when working with protocols.io to search, create, update, or publish protocols; manage protocol steps and materials; handle discussions and comments; organize workspaces; upload and manage files; or integrate protocols.io functionality into workflows. Applicable for protocol discovery, collaborative protocol development, experiment tracking, lab protocol management, and scientific documentation.

16k tokens

Tailored Resume Generator

by frostant

×4

Analyzes job descriptions and generates tailored resumes that highlight relevant experience, skills, and achievements to maximize interview chances

3k tokens

Excalidraw Diagram Generator

by github

vendor ×3

Generate Excalidraw diagrams from natural language descriptions. Use when asked to "create a diagram", "make a flowchart", "visualize a process", "draw a system architecture", "create a mind map", or "generate an Excalidraw file". Supports flowcharts, relationship diagrams, mind maps, and system architecture diagrams. Outputs .excalidraw JSON files that can be opened directly in Excalidraw.

Build and distribute Expo development clients locally or via TestFlight

Use when you have a written implementation plan to execute in a separate session with review checkpoints

Data structure for annotated matrices in single-cell analysis. Use when working with .h5ad files or integrating with the scverse ecosystem. This is the data format skill—for analysis workflows use scanpy; for probabilistic models use scvi-tools; for population-scale queries use cellxgene-census.

16k tokens

Benchling Integration

by christophacham

×3

Benchling R&D platform integration. Access registry (DNA, proteins), inventory, ELN entries, workflows via API, build Benchling Apps, query Data Warehouse, for lab data management automation.

Comprehensive molecular biology toolkit. Use for sequence manipulation, file parsing (FASTA/GenBank/PDB), phylogenetics, and programmatic NCBI/PubMed access (Bio.Entrez). Best for batch processing, custom bioinformatics pipelines, BLAST automation. For quick lookups use gget; for multi-service integration use bioservices.

24k tokens

How to use it

Copy the folder

Take posthog/simulate-returning-user from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.