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Official agent skill

Isolating Product Facade Contracts

by PostHog in PostHog/posthog

Plan and execute product isolation migrations to a facade plus contract layer in PostHog, following the Visual review architecture.

OfficialCustom licenceAuto-check passedDevelopment

Install Isolating Product Facade Contracts

skills CLI
$ npx skills add PostHog/posthog --skill isolating-product-facade-contracts -a claude-code

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

GitHub CLI
$ gh skill install PostHog/posthog isolating-product-facade-contracts --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/PostHog/posthog.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/isolating-product-facade-contracts .claude/skills/isolating-product-facade-contracts && 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
isolating-product-facade-contracts
GitHub stars
40k
Token cost
~9.5k tokens
SKILL.md length
4,960 words
Files
1
Skills in repo
252
Repo updated
First seen
Licence
Custom licence

At a glance

Plan and execute product isolation migrations to a facade plus contract layer in PostHog, following the Visual review architecture.

  • Works in 7 steps: products/architecture.md → products/README.md → docs/internal/monorepo-layout.md → …
  • With a PR strategy that minimizes review latency and conflicts with parallel work
  • SKILL.md covers Core docs to load first, When the tooling doesn't fit,…, "No in-process callers, so no… and Clearing coupling the scan…, plus 6 more sections
  • Calls git

What it does

Isolating Product Facade Contracts is an agent skill from PostHog/posthog, published by the product's own GitHub organization. Plan and execute product isolation migrations to a facade plus contract layer in PostHog, following the Visual review architecture. Use when a product still exposes internals (models/logic/views) across boundaries and needs migration toward contracts.py + facade/api.py + presentation separation, with a PR strategy that minimizes review latency and conflicts with parallel work.

Its SKILL.md is about 9.5k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development. It works with PostHog. The repository describes itself as: :hedgehog: PostHog is the leading platform for building self-driving products. Our developer tools – AI observability, analytics, session replay, flags, experiments, error…

When your agent uses it

  • With a PR strategy that minimizes review latency and conflicts with parallel work

Example prompts

  • “/isolating-product-facade-contracts”

Workflow steps

7 steps, taken from the first numbered list in SKILL.md.

  1. products/architecture.md
  2. products/README.md
  3. docs/internal/monorepo-layout.md
  4. posthog/models/team/README.md (team extension model rule)
  5. docs/published/handbook/engineering/type-system.md (serializer/OpenAPI type flow)
  6. docs/published/handbook/engineering/ai/implementing-mcp-tools.md (schema quality and team isolation expectations)
  7. .agents/security.md (SQL/HogQL security guidelines)

What it can do on your machine

Read from SKILL.md and the folder at commit 812e5c6. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • git

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

  • Network

    No URLs in SKILL.md. Its commands use git, which can reach the network depending on how they are called.

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

  • Credentials

    Names no API keys, tokens, secrets or passwords.

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

Context cost

Isolating Product Facade Contracts loads about 9.5k tokens when it runs. Until then it costs about 104 tokens; SKILL.md has 4,960 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~104
When it runs · the whole SKILL.md, loaded when a task matches
~9.5k

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

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 4,960 words (~9,505 tokens).

“Before you choose a product to isolate, check things already tried. It records which product was the first candidate, and why the field test moved to another one.”

— opening of SKILL.md by PostHog, Custom licence
name
isolating-product-facade-contracts

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .agents/skills/isolating-product-facade-contracts of PostHog/posthog.

Open the folder on GitHubat commit 812e5c6

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders. This page covers the copy in PostHog/posthog, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Isolating Product Facade Contracts 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.

Isolating Product Facade Contracts compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Isolating Product Facade Contracts this skillPostHog/posthog40k—~9.5kAutomated safety check: PassCustom licence
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Develop ExtensionPostHog/posthog-js628—~2.3kAutomated safety check: PassCustom licence
Adapter Alignmentevloghq/evlog1.9k—~1.3kAutomated safety check: PassMIT
Upgrade Claude AdapterPostHog/code179—~2.5kAutomated safety check: PassMIT
Metabase Prod Queryhaacked/dotfiles134—~1.5kAutomated safety check: NotesNone

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Works with

Categories

Questions about Isolating Product Facade Contracts

What does Isolating Product Facade Contracts do?

Plan and execute product isolation migrations to a facade plus contract layer in PostHog, following the Visual review architecture. Isolating Product Facade Contracts is an agent skill from PostHog/posthog, published by the product's own GitHub organization. Plan and execute product isolation migrations to a facade plus contract layer in PostHog, following the Visual review architecture.

When should I use Isolating Product Facade Contracts?

Isolating Product Facade Contracts fits situations like: with a PR strategy that minimizes review latency and conflicts with parallel work.

How do I install Isolating Product Facade Contracts in Claude Code?

Run `npx skills add PostHog/posthog --skill isolating-product-facade-contracts -a claude-code`. Or copy the skill folder (.agents/skills/isolating-product-facade-contracts in PostHog/posthog) into .claude/skills/isolating-product-facade-contracts in your project. Claude Code loads it when a task matches its description.

How do I install Isolating Product Facade Contracts in Codex?

Run `npx skills add PostHog/posthog --skill isolating-product-facade-contracts -a codex`. Or copy the skill folder (.agents/skills/isolating-product-facade-contracts in PostHog/posthog) into .agents/skills/isolating-product-facade-contracts in your project. Codex loads it when a task matches its description.

Can I use Isolating Product Facade Contracts 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 PostHog/posthog --skill isolating-product-facade-contracts -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/isolating-product-facade-contracts, .gemini/skills/isolating-product-facade-contracts, .github/skills/isolating-product-facade-contracts and .opencode/skills/isolating-product-facade-contracts in your project.

What does Isolating Product Facade Contracts need to run?

Going by SKILL.md and its folder, Isolating Product Facade Contracts needs the command-line tools its instructions call (git).

Does Isolating Product Facade Contracts access the network?

SKILL.md contains no URLs. Its commands use git, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Isolating Product Facade Contracts 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 Isolating Product Facade Contracts use?

Isolating Product Facade Contracts has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Isolating Product Facade Contracts use?

About 9.5k tokens (SKILL.md is roughly 38k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Isolating Product Facade Contracts?

Skills that share tags, products or a category with Isolating Product Facade Contracts: Create PR (UniClipboard/UniClipboard, 1.9k stars), Develop Extension (PostHog/posthog-js, 628 stars), Adapter Alignment (evloghq/evlog, 1.9k stars) and Upgrade Claude Adapter (PostHog/code, 179 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Isolating Product Facade Contracts?

PostHog (a GitHub organization, an official publisher) maintains it in PostHog/posthog, which has 40,200 GitHub stars. The repository holds 252 skills in this directory. The repository was last updated on October 9, 2026.

Source: PostHog/posthog on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.