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Open Code Review

Reviews Git diffs with a deterministic rule layer plus an LLM agent and writes line-level review comments

Install with npm

npm install -g @alibaba-group/open-code-review

Copied from the project's docs at github.com/alibaba/open-code-review

Why you'd want it

Open Code Review is a CLI that reads Git diffs and sends changed files to a configurable LLM through an agent that can read full files and search the codebase. Deterministic code, not the model, handles file selection, bundling of related files into sub-agent review units, and matching review rules to each file. Besides diff review, ocr scan reviews whole files, and delegation mode lets your own coding agent do the review so no OCR API key is needed. The docs list CI integrations for GitHub Actions, GitLab CI, GitFlic CI and Gerrit, and plugins for Claude Code, Codex, Cursor, Kimi Code and OpenCode.

Best for

  • Reviewing pull requests in CI
  • Rule-driven review of large changesets
  • Giving a coding agent a review command

Use it when

You want a code review step that runs from the command line or CI and keeps file selection and rule matching in fixed code instead of in a prompt.

Skip it if

You need high recall; the README says its recall is lower than general-purpose agents, a deliberate trade-off for precision. It needs Git 2.41 or newer and, outside delegation mode, an LLM provider with an API key you enter, and it sends changed files to that endpoint. The README links an OpenTelemetry telemetry page, so read it before using the tool on private code. The repo is about five months old and ships releases every few days.

Editor's note

Other install routes (install script, GitHub Release binary, from source) are listed at open-codereview.ai/docs/installation.

Related tools

Same category or shared tags.

  1. Spec Kit

    Devtool Standard

    Gives coding agents structured processes for spec-driven builds, bug fixes and idea assessment

    • 141k stars
    • 337 stars/day since creation
    • pushed
    • v1.2.0 on
    • MIT

    Install with uv and create a project

    uv tool install specify-cli
specify init my-project --integration copilot
    Use it when, skip it if, stats for Spec Kit

    Why you'd want it

    The specify CLI installs skills or command files for your coding agent, which you then run in chat: constitution once per project, then specify, plan, tasks, implement and converge for each feature. Optional extensions add a bug-fixing flow (assess, fix, test) and an idea assessment flow that ends in a go, clarify or stop decision, with reports saved as Markdown under .specify/. It has integrations for dozens of agents, including GitHub Copilot, Claude Code, Codex CLI, Cursor, Gemini CLI and Zed, and you can customize it with extensions, presets and workflows.

    Best for

    • Teams that want a spec before code
    • Keeping agent work reviewable step by step
    • Using one process across several coding agents

    Use it when

    You want a coding agent to work from a written specification, plan and task list rather than one prompt, with artifacts you review at each step.

    Skip it if

    Your changes are small enough that a single prompt does the job. The CLI needs Python 3.11+ and uv.

    Stats

    Stars
    141,363
    Last push
    Release
    v1.2.0,
    License
    MIT
    Pricing
    Open source
    Works with
    Claude Code, Cursor, Codex, Gemini CLI, Zed, Linux, macOS, Windows
    Stars per day, since repo creation
    337
    Tier
    Standard, not ranked

    Full stat block for Spec Kit

  2. Rank 1

    universal-modder

    Devtool

    Gives a coding agent skills, a CLI and a shared knowledge base for modding PC games you own

    • score 83
    • 7.8k stars
    • 509 stars/day since creation
    • pushed
    • MIT

    Install as a Claude Code plugin

    /plugin marketplace add rehan-remade/universal-modder
/plugin install universal-modder@universal-modder
    Use it when, skip it if, stats for universal-modder

    Why you'd want it

    universal-modder packages Agent Skills, three subagents and a Python CLI called um that a coding agent uses to mod a game: um scan finds Steam, Epic and Xbox installs and fingerprints the engine, loaders, anti-cheat and save folders, um backup snapshots saves, and um fal, um sprite and um render3d make and fit art, 3D and audio for the engine. The mod-any-game skill runs a fixed loop of recon, a backed-up lab, reading the real code, building one slice, testing it in the running game and writing a field note. Those field notes live in a knowledge base in the repo that agents search with um kb before starting and add to by pull request.

    Best for

    • Modding single-player PC games with an agent
    • Generating sprites and 3D assets for mods
    • Reusing other agents' modding notes

    Use it when

    You want Claude Code, Codex, Gemini CLI or another agent to work out how a game you own is built and ship a mod for it, with assets and an in-game test.

    Skip it if

    You play online games with anti-cheat: its own safety notes say injecting into an online client breaks the game's terms and gets accounts banned, and it refuses to do so. It touches game folders, saves, processes and your mouse and keyboard (asking first), asset generation needs a fal API key or a local ComfyUI server, and the repo is about two weeks old with no tagged release.

    Stats

    Stars
    7,794
    Last push
    Release
    none tagged
    License
    MIT
    Pricing
    Open source
    Works with
    Claude Code, Codex, Gemini CLI, VS Code, Cursor, Windows
    Stars per day, since repo creation
    509
    New and rising score
    83 of 100

    Full stat block for universal-modder

  3. Rank 8

    herdr

    Devtool

    Keeps coding agent terminals running in a background server and marks each pane as working, blocked or idle

    • score 58
    • 44.1k stars
    • 219 stars/day since creation
    • pushed
    • v0.9.5 on
    • Apache-2.0

    Install with Homebrew

    brew install herdr
    Use it when, skip it if, stats for herdr

    Why you'd want it

    herdr is a terminal workspace for coding agents, a single Rust binary that runs inside the terminal you already use. Terminals keep running in a background server when you close the client or lose an SSH connection, and after a restart it restores the saved layout and can resume supported agent sessions. Every pane is marked working, blocked or idle, local and saved SSH machines share one window, and agents can drive herdr through its CLI and socket API to spawn panes, prompt each other and wait until another agent is blocked. It runs Claude Code, Codex, Cursor, OpenCode and other agents without wrapping them, with tmux-style prefix keys and mouse control.

    Best for

    • Running many terminal agents side by side
    • Detaching from long agent runs
    • Agents on remote machines over SSH

    Use it when

    You run several CLI coding agents at once, often over SSH, and want to detach, come back and see which one needs an answer.

    Skip it if

    You already have a tmux setup you like and run one agent at a time. Agents can use herdr's socket API to spawn panes and prompt other agents, and after a server or machine restart the original processes are gone, only the layout and supported sessions come back.

    Stats

    Stars
    44,135
    Last push
    Release
    v0.9.5,
    License
    Apache-2.0
    Pricing
    Open source
    Works with
    Claude Code, Codex, Cursor, macOS, Linux, Windows
    Stars per day, since repo creation
    219
    New and rising score
    58 of 100

    Full stat block for herdr

For agents

The same entry, as files an agent can read without scraping this page. 

# read one entry
curl -s https://agenttooldrop.com/tools/open-code-review.md

# list the MCP servers in the catalog
curl -s https://agenttooldrop.com/tools.json \
  | jq -r '.tools[] | select(.category=="mcp-server") | .slug'