Create test
Commit to a Test. Its intent is frozen from this moment.
Pass a next_test_id computed now (same window / funnel), or a custom test with its hypothesis and the evidence it rests on. A changed mind is a new Test with supersedes_id, never an edit. Touches nothing on Meta.
Requires a key with write scope or higher.
MCP: meta_create_test.
bearerAuthAuthorizationBearer <token>An API key from Settings → API keys, sent as Authorization: Bearer rsk_….
Authorization has two independent axes.
The scope is ranked — a key satisfies any requirement at or below its own tier:
read— every GET.write— launch ads PAUSED, sync, pull history, edit thresholds, Values, briefs, tests, swipes and research.admin— everythingwritecan. No operation requires more thanwritetoday.
There is no approve scope. It was a rung once; it is not one now, and a key requested with it is rejected.
The approval grant (can_approve) is a separate boolean, not a rung. Changing spend on Meta — activating a launch, pausing or resuming ads, retargeting an ad set, or rebuilding a launch's live creative — needs write and the grant. Keeping them on separate axes is what makes the review gate a control rather than a convention: a key that may propose is not automatically a key that may approve its own proposal.
A key reaches the one workspace — one Meta ad account — it was minted in, and stops working when the operator who minted it leaves the workspace. The same key authenticates the MCP endpoint (/api/mcp) for a headless agent, with the same scope and grant.
Idempotency-Key?stringAny unique string up to 256 characters. A retry with the same key and body replays the first success (Idempotency-Replay: true) instead of doing the work twice; the same key with a different body is refused.
length <= 256application/json- body
next_test_id?string1 <= length <= 300window?string"90d""30d""90d""180d""lifetime"funnel?stringThe funnel the Next tests were read in; for an exploration that pools funnels, where to run it.
"instant_form""website""messaging""profile""traffic""unknown"custom?hypothesis?stringOverrides the default hypothesis written from the Next test.
length <= 800comparator?string"baseline""reference""baseline"min_expected_goals?number1 <= value <= 1000maturity_days?integer0 <= value <= 90window_days?integer1 <= value <= 180supersedes_id?string^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$uuidbrief_id?stringThe brief this Test judges; it is linked, and learned when the Test concludes.
^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$uuidCreated. The body is the tool's own result — the same payload the MCP tool returns.
application/json- response
curl -X POST 'https://winandscale.com/api/v1/tests' \ -H 'Content-Type: application/json' \ -d '{}'{}