A single source of truth (SSOT) for agent rules is one canonical document from which every tool-specific instruction file — CLAUDE.md, AGENTS.md, .cursor/rules — is generated or derived.
Generation works on the day you run it. Afterward, the generated copies are still editable files sitting on disks; the first hotfix applied to a generated copy instead of the source re-opens the divergence. An SSOT without deployment and drift detection is one more copy that happens to be labeled "canonical."
Generation plus zero-touch deployment (so local edits are never needed) plus detection (so local edits that happen anyway are caught).
This entry is part of the untactit glossary. Definitions draw on measured write-ups published on the blog.
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