Analyze every entry of a huge JSONL file with Claude Code subagents
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Evidence: Described by posterThe person describes what happened in words, without screenshots or video.
Outcome
Claude Code previewed the data, trimmed fields, defined a schema and ran hundreds of Haiku subagents over ~45 minutes so every entry in a large JSONL file was analyzed.
Agent
Prompt Recreated prompt
The source did not publish its exact prompt. This one is our reconstruction from what the source describes.
This JSONL file is too big to read by hand, but I want an agent to look at every entry. Define a common schema in a JSONL file to answer these questions, then complete the analysis.
Source
https://x.com/sean_moriarity/status/2012220803023073539
By Sean Moriarity (@sean_moriarity) · Published Jan 16, 2026 · Added Oct 15, 2026 · Last verified Oct 15, 2026
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