Source record

Published by Amp News (ampcode.com) (T1 source). The original is at https://ampcode.com/news/a-faster-librarian.

Pipeline notes

The summary and note below are generated by the signal pipeline — they are Beyond Desk’s reading, not quotations from the source.

Amp's Librarian sub-agent for code and documentation search was made ~3x faster (237s → 81s) and 43% cheaper by switching from Sonnet 4.6 with reasoning to GPT-5.5 without reasoning, enabling OpenAI's websocket mode and a system prompt that drives ~8 parallel tool calls per turn instead of ~3, completing searches in ~5 turns instead of ~15.

Real engineering breakdown showing websocket mode and dropping reasoning each contribute measurable speedups for retrieval agents — a transferable pattern for simple lookup sub-agents.

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