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🔍Open Code Review

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alibaba/open-code-review · homepage ↗

Fast, efficient, battle-tested at Alibaba's scale. Hybrid architecture code review tool: deterministic pipelines + LLM Agent, precise line-level comments, built-in multi-language ruleset (NPE, thread-safety, XSS, SQL injection), OpenAI & Anthropic compatible.

⭐ Very popular: 21k stars, gaining about 1k a week

View on GitHub ↗

repo profile

vintage 2026 launched this year
delivery product
language Go
license Apache-2.0

momentum

total stars 21k
stars added last week +1k
HN peak 284 pts 2mo ago
binary downloads 335 total · GitHub releases
used by 64 repos & packages
commits / week 58 accelerating · +39% vs prior mo
contributors 130
release cadence weekly
last activity today

durability

backing company-owned Alibaba
openness permissive
bus factor 2 concentrated
top-author share 49% 6 mo

bus factor = how many people it takes to cover more than half the commits (6 months). 1 is a solo project; higher means the work is spread across a team. top-author share is the single busiest author's slice of those commits.

why it's a big deal

  • Beats general-purpose agents on precision and F1 across 200 real PRs, at roughly a ninth of the token cost.
  • Delegation mode runs the review with your own agent’s model, no separate API key needed.
  • Validated at Alibaba’s internal scale against millions of real defects before being open-sourced.

under the hood

  • Hybrid architecture: deterministic engineering (file selection, bundling, rule matching) handles what must not go wrong, an LLM agent handles the rest.
  • ocr scan reviews whole files or directories with no diff needed, useful for auditing unfamiliar codebases.
  • Built-in ruleset covering NPE, thread-safety, XSS, and SQL injection, compatible with OpenAI and Anthropic models.

our take from PR#40, 2026-08-12

star history

PR#40 · 20k21k now May 2026Aug 2026
  1. PR#40 20k 2026-08-12
  2. now 21k + 337 since first covered

curve is sampled from GitHub's star history, plus our own daily readings since we covered it; the dashed stretch is before we first covered it, the solid line since. figures at coverage are the numbers we printed then (approx.), current count is live.

understory

Output and attention are roughly in balance.

-9 understory score output 78 · clout 87
Aug 2025 Jul 2026
  • output, commits & releases
  • clout, star velocity

output = commits & releases; clout = star velocity, both 0 to 100 monthly indices; the gap where output runs above clout is the understory. The understory →

covered in

  • PR#40 2026-08-12 on the radar

    Alibaba’s internal reviewer, now open source

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