I wrote this up a bit more formally: csswizardry.com/2026/08/how-...
csswizardry.comHow to Find an Exact Gmail Thread with Codex or Claude – CSS WizardryUse Gmail’s Message-ID to point Codex or Claude at one exact email and retrieve the complete conversation rather than a plausible result.
Instead of asking Codex to look in Gmail for ‘[subject]’ (risky and prone to duplicates or misinterpretation), head to ‘Show original’ and use the RFC 822 `MESSAGE-ID` (from 1982!) to target an exact specific message. From there, it can surface the entire visible thread.
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