# Story: Collapsible Tool Outputs

## User Story
**As a** User
**I want** tool outputs (like long file contents or search results) to be collapsed by default
**So that** the chat history remains readable and I can focus on the Agent's reasoning.

## Acceptance Criteria
*   [ ] Frontend: Render tool outputs inside a `<details>` / `<summary>` component (or custom equivalent).
*   [ ] Frontend: Default state should be **Closed/Collapsed**.
*   [ ] Frontend: The summary line should show the Tool Name + minimal args (e.g., "▶ read_file(src/main.rs)").
*   [ ] Frontend: Clicking the arrow/summary expands to show the full output.

## Out of Scope
*   Complex syntax highlighting for tool outputs (plain text/pre is fine).