setting-up-data-catalog
SkillPopulates and maintains a project's data catalog (semantic layer): canonical metrics, trust marks (certifications) on warehouse tables/views, and reviewed table relationships. Use when asked to set up / seed / bootstrap the data catalog or semantic layer, to catalog a project's metrics, to certify o
Install
git clone https://github.com/PostHog/ai-plugin.git ~/.claude/skills/setting-up-data-catalogWhat is setting-up-data-catalog?
Populates and maintains a project's data catalog (semantic layer): canonical metrics, trust marks (certifications) on warehouse tables/views, and reviewed table relationships. Use when asked to set up / seed / bootstrap the data catalog or semantic layer, to catalog a project's metrics, to certify or deprecate data sources, to propose or review table joins, or to work through the proposal review queue. To *use* an existing catalog to answer a business-number question, see querying-posthog-data instead. Trigger terms: data catalog, semantic layer, canonical metric, certify table, deprecate source, relationship proposal, metric drift, review queue.
What this can do
Capabilities declared in this component's own frontmatter — not inferred.
Inherit all session tools
Declares no tool restrictions — inherits every session tool
~164 tokens of context used while enabled, before you invoke anything
Documentation
README · ~3 min readSetting up and maintaining the data catalog
The data catalog is a per-project inventory of three things that otherwise live only in people's
heads: metrics (what a number canonically means), certifications (which of many similar
tables/views to trust), and relationships (how tables join). It describes existing data; it never
copies it. The read path is SQL (system.information_schema); writes go through the data-catalog MCP
tools.
This skill covers populating and curating the catalog. To consume it — answer a business number
by checking for a canonical metric before deriving one — see the querying-posthog-data skill.
Trust model: everything an agent writes lands unapproved. Promotion — approving a metric, certifying a source, accepting a join — requires a human to type a confirmation (the promotion tools
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