# Review by Andrej Karpathy (Round 3)

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## Review Complete — Andrej Karpathy, Round 3

VERDICT: approve

FINDINGS:
- [src/colonyos/repo_map.py:29-30]: Duplicate comment `# Hardcoded sensitive file patterns that are always excluded (FR-6).` — cosmetic leftover from inserting the size guard constant
- [src/colonyos/repo_map.py:680-685]: Greedy truncation breaks on first oversized file, leaving ~5-10% budget slack — correct tradeoff for V1 since ranking ensures most important files come first
- [src/colonyos/cli.py:1282]: `type(repo_map_config)(...)` should be `dataclasses.replace()` — more idiomatic, but functionally equivalent
- [src/colonyos/repo_map.py:SENSITIVE_PATTERNS]: Missing `*.p12`, `*.pfx`, `id_rsa*` — low severity since these are rarely git-tracked and map contains only file names, not contents

SYNTHESIS:
This is a well-executed V1 that solves the cold-start problem the right way. The core insight is correct — every agent phase currently burns 3-8 tool calls on exploration, and those results pollute the context window. A fixed ~4000 token structural injection is an excellent trade. The programmatic injection avoids the `str.format()` `KeyError` trap on `{`/`}` in Python signatures. The relevance ranking is appropriately simple (keyword overlap with scored tiers) — an embedding ranker would add a dependency and stochastic behavior to what should be deterministic. `ast.parse()` is analysis-only with proper size guards and timeout. All 8 pipeline phases are injected. 660 tests pass, zero regressions. Ship it.

Review saved to `cOS_reviews/reviews/andrej_karpathy/20260331_round3_build_a_repomap_module.md`.