Show HN: Mermaidiff – git diff for behavior, PRs as sequence diagrams

Category: devtools

Tags: git-diff, sequence-diagram, ai-agent, code-review, developer-tools

Score: 6.3/10 (Innovation: 7, Technical: 5, Documentation: 7, Utility: 6)

Mermaidiff is an AI-agent skill that generates a behavior-focused git diff as a Mermaid sequence diagram, highlighting added, changed, and removed steps. It works inside Claude Code and Codex, supports GitHub PRs and GitLab MRs, and emphasizes no false positives via evidence-backed claims. It's interesting because it offers a compact, visual way to understand code changes in seconds rather than reading the full diff.

Target audience: backend developers, frontend developers, code reviewers, engineering teams using AI coding agents

Repository: https://github.com/osmangoninahid/mermaidiff · Python · MIT · 14 stars

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