Diagnosing experiment results

This skill answers: My PostHog experiment results look wrong, biased, or empty — what's going on?

Match the user's complaint in the dispatch table, then read the matching reference file for the diagnostic.

Each diagnostic in the reference files is tagged [HIGH], [MEDIUM], or [LOW] based on how strongly it's verified — [HIGH] is verified directly in PostHog code, [MEDIUM] is partially or team-source verified, [LOW] describes SDK/external behavior that wasn't verified here. Treat [LOW] items as hypotheses to test, not facts to assert.

Step 1 — Resolve the experiment

If the user refers to an experiment by name or description, load the finding-experiments skill first to resolve it to a concrete ID.

Call experiment-get and pull these fields. They are inputs for almost every diagnostic: