Kyle Carberry
c0f93583e4
## Summary
Tool call failures in `/agents` previously displayed alarming red
styling (red icons, red text, red alert icons) that made it look like
the user did something wrong. This PR replaces the scary error
presentation with a calm, unified style and adds a dedicated timeout
display for subagent tools.
## Changes
### Unified failure style (all tools)
- Replace red `CircleAlertIcon` + `text-content-destructive` with a
muted `TriangleAlertIcon` in `text-content-secondary` across **all 11
tool renderers**.
- Remove red icon/label recoloring on error from `ToolIcon` and all
specialized tool components.
- Error details remain accessible via tooltip on hover.
### Subagent timeout display
- `ClockIcon` with "Timed out waiting for [Title]" instead of a generic
error display.
- `CircleXIcon` for non-timeout subagent errors with proper error verbs
("Failed to spawn", "Failed waiting for", etc.) instead of the
misleading running verb ("Waiting for").
- Timeout detection from result string/error field containing "timed
out".
### Title resolution for historical messages
- `ConversationTimeline` now computes `subagentTitles` via
`useMemo(buildSubagentTitles(...))` and passes it to historical
`ChatMessageItem` rendering, so `wait_agent` can resolve the actual
agent title from a prior `spawn_agent` result even outside streaming
mode.
### Stories
8 new stories: `GenericToolFailed`, `GenericToolFailedNoResult`,
`SubagentWaitTimedOut`, `SubagentWaitTimedOutWithTitle`,
`SubagentWaitTimedOutTitleFromMap`, `SubagentSpawnError`,
`SubagentWaitError`, `MCPToolFailedUnifiedStyle`.
## Files changed (15)
- `tool/Tool.tsx` — GenericToolRenderer + SubagentRenderer
- `tool/SubagentTool.tsx` — timeout/error verbs, icon changes
- `tool/ToolIcon.tsx` — remove destructive recoloring
- `tool/*.tsx` (10 specialized tools) — unified warning icon
- `ConversationTimeline.tsx` — pass subagentTitles to historical
rendering
- `tool.stories.tsx` — 8 new stories, updated existing assertions
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