Plannotator v0.21.3 adds file-scoped review comments and Codex app-server support

• Plannotator v0.21.3 shipped file-scoped review comments, a unified comment flow, and per-file Ask AI chats that now open by default, according to plannotator's release post.
• The same release moved Codex onto a more reliable app-server path, per plannotator's release post.
• Plannotator also kept pushing its agent handoff story: plannotator's agent-session post says external agents can connect to a live Plannotator session for guided reviews and markdown plan checks.
• A separate demo from plannotator's checklist tip shows the product using live markdown updates as an agent-visible progress surface.

You can jump from the release details link to the agent connection post, and the attached demos show two specific UI changes that matter here: plannotator's diff-highlight reply adds line-range highlighting when you select a comment, while plannotator's checklist demo shows Plannotator acting as a live checklist view instead of a passive review pane.

The code review changes are mostly about making review state more local to the file you are looking at.

• File-scoped comments
• Unified comment UX
• Per-file Ask AI chats opening by default
• A fix for dead sidebar clicks after switching PRs

plannotator's diff-highlight reply adds one more review detail not spelled out in the main changelog: selecting a diff comment now highlights the exact line range it applies to.

plannotator's agent-session post frames Plannotator as something an external agent can attach to live, not just a UI a human clicks through. The cited use cases are custom guided reviews and markdown document or plan reviews on the annotate side.

In plannotator's checklist tip, the same pattern shows up as a live checklist flow. An agent updates a markdown file directly, Plannotator listens for changes, and the UI becomes a real-time progress view without spending HTML tokens.

The release bundles three smaller fixes alongside the review features:

• Codex now runs on a more reliable app-server path
• The VS Code extension got clipboard and keyboard fixes
• The CLI got subcommand --help fixes

A follow-up reply from plannotator's workspaces reply adds one rollout detail not in the launch post: workspace-style capability is being rolled out as a Plannotator Workspaces offering, while open source support is only described as a possible future path.