Meta just published how they mapped their entire pipeline codebase into a graph AI agents can navigate
Their agents stopped breaking things and now use 40% fewer tool calls. And the whole setup is easy to copy for your own repos.
The problem: 4,100+ files, 4 repos, 3 languages. AI agents kept breaking things because the rules lived only in people's heads.
So they ran 50+ agents in one session:
> explorers map every folder
> 11 analysts read every file
> writers turn it into context files
> 10 critics review it in 3 rounds
> fixers and testers clean up
Every analyst asks the same 5 questions about a module: what it configures, how it's changed, what breaks it, what depends on it, what's hidden in comments.
The output is 59 tiny files, 25–35 lines each. They call it "compass, not encyclopedia".
> coverage: 5% → 100%
> 40% fewer tool calls for agents
> zero hallucinated file paths
And a job re-checks everything every few weeks. In their words, stale context is worse than none.
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