7 min readAI Dev Review
Feeding a monorepo to an AI agent without going broke
Naive context loading in a monorepo will blow your token bill. Here's the strategy we use.
MonoreposBest Practices
Every AI tool struggles at monorepo scale — either the agent misses obvious context or you pay for embeddings you'll never use. A few boring rules keep costs sane and quality high.
The rules
- Root-level AGENT.md pointing to package-level READMEs. Never let the agent guess repo layout.
- Per-package .aiignore that hides fixtures, snapshots, and generated code.
- Explicit 'read only these paths' in the prompt for cross-package changes.
The savings
Same 30 tasks, same tool, disciplined context: 42% cheaper and measurably higher quality. The upfront hour of setup paid for itself the first day.
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