Deep-research agents run unsupervised for twenty minutes and their report goes straight to an executive. The failure mode is not a crash, it is confident citations that do not support the claims. Most candidates design the retrieval and skip the verification pass, the run budget, and the freshness story.
Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.
Deep-research agents run unsupervised for twenty minutes and their report goes straight to an executive. The failure mode is not a crash, it is confident citations that do not support the claims. Most candidates design the retrieval and skip the verification pass, the run budget, and the freshness story.
The senior signal is treating trust as a verification problem, not a prompting problem: a dedicated citation pass that re-opens each cited source and checks it against the final draft, per-claim provenance rendered for the reader, and a stated freshness window. Strong candidates also route the private corpus through the customer's own permission model (never a side index that ignores ACLs), allowlist and snapshot web access, and cap the run's token and subagent budget in the orchestration layer. Watch for candidates who quote the multi-agent quality gain without the token cost, or who treat 'no support found' as something to hide rather than the behavior that earns trust.
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