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Vance IngallsandClaude Opus 5
98b23a8850
Closes both cross-surface findings with one mechanism. The CLI publishes
window.__HF_CLI_CANARY_DECISIONS ({ name: boolean }); a CLI-launched
Studio takes it as authoritative over its own seed, URL override and the
registry percentage.
Studio re-deriving could not agree with the CLI in three cases:
- Telemetry off. The CLI resolves telemetry_opt_out, but Studio's
opt-out is a separate localStorage flag it cannot see, so it would
evaluate normally and could enrol on a render the CLI excluded. The
previous commit gated each surface independently; that fixed silent
enrolment per surface but NOT the disagreement between them.
- HF_CANARY_* override. Env vars never cross into the browser — Studio
reads only its URL param / sessionStorage — so a support session
forcing a canary on got the CLI forced and Studio guessing.
- No seed injected. Studio falls back to a different unit id, i.e. a
different bucket.
Shipping the decision instead of the inputs makes divergence structurally
impossible: one evaluation, two surfaces. It also exposes strictly less —
booleans about features, rather than the seed buckets derive from — which
is why it is safe to publish with telemetry off, the case it exists for.
Studio still evaluates locally when standalone, or for a canary the CLI
did not publish, and ignores a non-boolean value rather than trusting it.
Tests: 6 Studio (CLI-off wins over unset local flag, CLI-on with no URL
param, beats contradicting override, beats seed, falls back per-canary,
rejects non-boolean) and 4 CLI (decisions with telemetry off and no
identity, alongside identity when on, script-tag escaping on a hostile
canary name, throwing resolver degrades to identity only). Four existing
identity tests asserted the old "nothing when telemetry off" contract and
were updated; the registry is now mocked there so string assertions don't
move when a canary is added or ramped. Fault injection: dropping the
adoption fails 4.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
