Show HN: Plannotator – annotate agent plans, diffs, and HTML

Category: devtools

Tags: ai-agents, code-review, developer-tools, annotations, agent-hooks

Score: 7.5/10 (Innovation: 7, Technical: 8, Documentation: 8, Utility: 7)

Plannotator is a local, browser-based review surface for AI coding agents that allows developers to annotate plans, diffs, and HTML artifacts, sending feedback directly back to the agent. Its innovative combination of agent hooks, encrypted sharing, and multi-agent support fills a clear gap in the AI-assisted development workflow. The project is interesting for its practical integration with major AI coding tools and its focus on improving human-in-the-loop review processes.

Target audience: backend devs, AI/ML engineers, full-stack devs

Repository: https://github.com/backnotprop/plannotator · TypeScript · Apache-2.0 · 6072 stars

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