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Not every source belongs in an operational assistant
One of the most common mistakes in RAG projects is assuming every available document deserves to be indexed. In operational settings, that is risky. An outdated, duplicated, or unapproved source can make the assistant answer quickly while still pushing the wrong decision.
The citable-sources model starts by restricting before it accumulates.
The four tests of a valid source
A useful operational source should pass four tests: currency, authority, granularity, and traceability. If it fails one of them, it should not feed critical answers without mediation.
- Currency: a current version exists and old versions can expire.
- Authority: the issuer or approver is known.
- Granularity: content can be retrieved without mixing incompatible contexts.
- Traceability: the exact fragment behind an answer can be preserved.
What to do with tacit knowledge
Some of the most valuable operating knowledge is unwritten or lives in informal notes. Ignoring it is naive; indexing it as-is is also naive. The answer is not to dump everything into the system, but to create a validation step before that knowledge earns the status of source.
Without that, the assistant inherits noise dressed up as authority.
Why the rubric improves more than the prompt
When an answer fails, the usual reflex is to tweak the prompt. Sometimes that helps, but the problem is often lower in the stack: the system retrieved the wrong source or failed to prioritize a better one. A strong source rubric corrects that before the model writes a single line.
In other words: a disciplined corpus beats a clever prompt.
How to roll it out without slowing teams down
The rubric works when it is integrated into the editorial or operational flow of content: intake, review, expiration, and retirement. If it depends on a heroic audit every six months, it will arrive late.
Useful practice turns source quality into an operating habit, not a side project.
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