Module render 

Pure view: fn render(&State, &mut RenderCache, &mut Frame).

Three contracts:

1. Never mutates State. The view is fully derived.
2. Never performs I/O. All state — model lists, MCP status, file contents — is whatever the reducer put in State.
3. Never holds a &mut App / &mut anything other than the Frame ratatui owns and the render-layer RenderCache (which is memoization + scroll-position bookkeeping, not reducer state).

Signature: fn render(&State, &mut RenderCache, &mut Frame). The &mut RenderCache is memoization only (markdown parse cache, scroll position, theme choice) — it never affects reducer outcomes or persisted state.

Modules

diff

Diff rendering shared between the file-mutating tools (write_file, apply_patch) that PRODUCE diff output and the chat renderer that COLORS added/removed lines. Both the marker conventions and the producer ([generate_display_diff]) live here in the render layer, so every tool that needs a display diff shares one implementation and one format.

markdown

theme

widgets

Stateless TUI widgets.

Structs

RenderCache

Transient render-layer state that lives across frames but isn’t reducer state. Owned by app::run_interactive; passed as &mut to render() per frame.

Functions

render

The entrypoint. Call once per render pass from the main loop.