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The doc asserted that usage-metrics headers are never returned even when `X-Tinfoil-Request-Usage-Metrics: true` is sent. That observation was made against PPQ's `/private/` endpoint on 2026-06-21 and contradicts the "Usage metrics header format" section added later (2026-07-08), which documents the header as present. Scope the older claim to the PPQ endpoint and cross-reference the verified section, so the doc no longer contradicts itself. While verifying against the direct enclave, two further gaps surfaced: - The `/v1/responses` open question is answered: it does return `X-Tinfoil-Usage-Metrics` as a plaintext response header with the same field set as `/v1/chat/completions`, including `cost_usd`. - Streaming trailers are emitted twice in a single comma-joined field. Note this so a future trailer reader is tolerant of the duplicate.