Krux
April 8, 2026
Meta Cut Two-Day Code Tasks to 30 Minutes
Published: April 8, 2026 at 12:40 AM
Updated: April 8, 2026 at 12:40 AM
100-word summary
Meta built 50 specialized AI agents to document the unwritten rules buried in its data pipeline codebase. The agents read 4,100 files across three languages and distilled tribal knowledge into 59 short context files, each 25 to 35 lines. Complex workflows that used to take two days now finish in 30 minutes. The secret wasn't feeding AI more code, but pre-computing what matters: non-obvious dependencies, design quirks, and the kind of shortcuts veterans know but never write down. Three rounds of AI critics verified every file path and boosted quality scores from 3.65 to 4.20 out of 5. The files self-refresh every few weeks, so the knowledge doesn't rot. Turns...
What happened
Meta built 50 specialized AI agents to document the unwritten rules buried in its data pipeline codebase. The agents read 4,100 files across three languages and distilled tribal knowledge into 59 short context files, each 25 to 35 lines. Complex workflows that used to take two days now finish in 30 minutes. The secret wasn't feeding AI more code, but pre-computing what matters: non-obvious dependencies, design quirks, and the kind of shortcuts veterans know but never write down. Three rounds of AI critics verified every file path and boosted quality scores from 3.65 to 4.20 out of 5. The files self-refresh every few weeks, so the knowledge doesn't rot.
Why it matters
Turns out the best documentation is a compass, not an encyclopedia.