# PRobe > AI-powered code review browser extension that lives inside GitHub, letting you chat about pull requests, focus on specific files, and post AI suggestions as PR comments. PRobe is a free, open-source Chrome extension that brings AI-powered code review directly into the GitHub pull request interface. It uses your own Anthropic API key to provide context-aware chat, focused file analysis, and one-click comment posting — all without leaving the PR page. Setup takes under 60 seconds: install the extension, add your API key and GitHub token, and PRobe automatically loads diff context whenever you open a pull request. - **Context-aware chat** — *Ask questions about the entire PR diff and get answers grounded in the actual code changes.* - **Focus context** — *Zoom into specific files or line ranges to ask targeted questions about individual functions or hunks.* - **Review skills** — *Attach custom skill files (e.g., `react-best-practices.md`) to guide the AI's review style and domain knowledge.* - **One-click reviews** — *Turn AI-generated suggestions directly into real GitHub PR comments without copy-pasting.* - **X-Ray mode** — *Inspect exactly which context and skills the AI used to generate its answer, keeping reviews transparent.* - **PR dashboard** — *Get a high-level overview of file changes, additions, deletions, reviewers, and commits before diving in.* - **Bring your own keys** — *Uses your Anthropic API key and GitHub token, so no data is stored or proxied through a third-party server.* - **Open source** — *The full extension source is available on GitHub under an open license; contributions are welcome.* ## Features - Context-aware PR chat - Focus context on specific files and lines - Custom review skills via markdown files - One-click post AI suggestions as PR comments - X-Ray mode to inspect AI context used - PR dashboard overview - Bring your own Anthropic API key - Automatic diff context loading - Open source extension ## Integrations GitHub, Anthropic Claude ## Platforms WEB, API, BROWSER_EXTENSION ## Pricing Open Source ## Links - Website: https://getprobe.dev - Documentation: https://getprobe.dev/#getting-started - Repository: https://github.com/getprobe-dev/probe-extension - EveryDev.ai: https://www.everydev.ai/tools/probe-ai-code-review