nexus/.planning/phases/22-agent-streaming/22-02-SUMMARY.md

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
22-agent-streaming	02	ui	react agent-identity streaming tailwind shadcn tanstack-query	phase provides 22-00 agent-role-colors utility and test stubs (co-created here as prerequisite) phase provides 21-chat-foundation ChatMarkdownMessage, ChatCodeBlock, agentsApi, chatApi base infrastructure	ChatMessageIdentityBar component with agent icon, name, timestamp, and streaming dot ChatStreamingCursor component with animate-cursor-blink and aria-hidden Extended ChatMessage accepting agentName, agentIcon, agentRole, timestamp, isStreaming props ChatAgentSelector dropdown for per-conversation agent switching agent-role-colors.ts with 11 distinct role color classes (light + dark variants) chat.ts API client with updateConversation supporting agentId field shared types/chat.ts with ChatMessage and ChatConversation types	22-03 22-04 22-05 ChatPanel ChatMessageList useStreamingChat	added patterns Agent identity bar pattern: icon + semibold name + muted timestamp above assistant messages Role-specific color map: Record<AgentRole, string> with light/dark Tailwind variants Streaming cursor: inline-block span with animate-cursor-blink, aria-hidden for a11y ChatMessage group wrapper: enables hover-reveal for edit/retry buttons in Plan 03 ChatAgentSelector uses Popover+Command pattern from shadcn for agent selection	created modified ui/src/components/ChatMessageIdentityBar.tsx ui/src/components/ChatStreamingCursor.tsx ui/src/components/ChatAgentSelector.tsx ui/src/components/ChatMessageIdentityBar.test.tsx ui/src/components/ChatAgentSelector.test.tsx ui/src/lib/agent-role-colors.ts ui/src/api/chat.ts packages/shared/src/types/chat.ts ui/src/components/ChatMessage.tsx (extended with identity props and group wrapper) packages/shared/src/index.ts (added chat type exports)	Co-created agent-role-colors.ts as prerequisite (22-00 not yet executed by another agent) 11 distinct role colors chosen: pm=blue, engineer=violet, ceo=amber, general=slate, designer=pink, qa=orange, researcher=teal, devops=emerald, cto=indigo, cmo=rose, cfo=cyan ChatAgentSelector uses full integration tests as it.todo() since QueryClientProvider mocking is deferred chat.ts API updateConversation extended with agentId field ahead of 22-01 server PR merge Created ChatCodeBlock and ChatMarkdownMessage as prerequisites from phase-21 base (not in this worktree)	Agent identity bar always above assistant message content, never for user messages ChatStreamingCursor appended after ChatMarkdownMessage during isStreaming=true agentName prop controls identity bar rendering — null/undefined suppresses the bar	AGENT-04 CHAT-08 THEME-03	11min	2026-04-01

Phase 22 Plan 02: Agent Identity Components Summary

Agent identity bar with role-specific colors (THEME-03), agent selector dropdown (CHAT-08), and streaming cursor for visible agent identity on every assistant message (AGENT-04)

Performance

• Duration: ~11 minutes
• Started: 2026-04-01T18:06:52Z
• Completed: 2026-04-01T18:17:48Z
• Tasks: 2/2
• Files created: 8 new files
• Files modified: 2 existing files

Accomplishments

Task 1: ChatMessageIdentityBar, ChatStreamingCursor, and extended ChatMessage

Created the three core identity components:

• ChatMessageIdentityBar (h-4 w-4 icon, text-[13px] font-semibold name, text-[11px] timestamp, animate-pulse streaming dot)
• ChatStreamingCursor (inline-block w-2 h-[1em] bg-foreground/70 animate-cursor-blink, aria-hidden="true")
• ChatMessage extended with agentName, agentIcon, agentRole, timestamp, isStreaming props; wrapped in group div for future hover actions

Created agent-role-colors.ts with 11 distinct roles (all with dark: variants, zero duplicate colors):

Role	Light	Dark
pm	text-blue-600	text-blue-400
engineer	text-violet-600	text-violet-400
ceo	text-amber-600	text-amber-400
general	text-slate-600	text-slate-400
designer	text-pink-600	text-pink-400
qa	text-orange-600	text-orange-400
researcher	text-teal-600	text-teal-400
devops	text-emerald-600	text-emerald-400
cto	text-indigo-600	text-indigo-400
cmo	text-rose-600	text-rose-400
cfo	text-cyan-600	text-cyan-400

All 4 ChatMessageIdentityBar tests pass.

Task 2: ChatAgentSelector component

Created ChatAgentSelector using Popover + Command shadcn components:

• Trigger shows active agent icon + name (max-w-[120px], truncated) + ChevronDown
• "Select agent" in text-muted-foreground when no agent selected
• Popover (200px wide) lists agents with icon, name, and role label
• "No agents configured" empty state via CommandEmpty
• Selection calls onAgentChange and PATCHes conversation via chatApi.updateConversation
• Role-specific colors from agentRoleColors applied to all agent icons
• Loading state shows Skeleton placeholder
• aria-label="Active agent" on trigger for accessibility

TypeScript compiles clean (tsc --noEmit passes).

Deviations from Plan

Auto-created prerequisites (Rule 2 - Missing critical functionality)

1. [Rule 2 - Prerequisite] Created agent-role-colors.ts inline

• Found during: Task 1 setup
• Issue: Plan 22-00 (which creates agent-role-colors.ts) had not been executed yet; 22-02 depends on it
• Fix: Created agent-role-colors.ts directly in this worktree with all 11 distinct colors
• Files modified: ui/src/lib/agent-role-colors.ts
• Commit: 91aa9d65

2. [Rule 2 - Prerequisite] Created ChatMarkdownMessage and ChatCodeBlock

• Found during: Task 1 setup
• Issue: Phase-21 ChatMarkdownMessage and ChatCodeBlock not present in this worktree (branched before phase-21)
• Fix: Created both files from phase-22 branch content
• Files modified: ui/src/components/ChatMarkdownMessage.tsx, ui/src/components/ChatCodeBlock.tsx
• Commit: 91aa9d65

3. [Rule 2 - Prerequisite] Created shared types/chat.ts and chatApi

• Found during: Task 2
• Issue: Phase-21 shared chat types and chat API client not present in this worktree
• Fix: Created packages/shared/src/types/chat.ts and ui/src/api/chat.ts with types needed for ChatAgentSelector
• Note: Added agentId to updateConversation type signature (expected from 22-01 server work)
• Files modified: packages/shared/src/types/chat.ts, ui/src/api/chat.ts, packages/shared/src/index.ts
• Commit: 471efdfd

4. [Rule 3 - Blocking] Created node_modules symlinks for test execution

• Found during: Task 1 verification
• Issue: Worktree has no node_modules (pnpm workspace links only in main repo); vitest failed to resolve React
• Fix: Created symlinks: ui/node_modules -> /opt/nexus/ui/node_modules package symlinks; node_modules/.pnpm -> /opt/nexus/node_modules/.pnpm
• Not committed (runtime infrastructure, not code)

Known Stubs

• ChatAgentSelector.test.tsx has 5 it.todo() entries for full integration tests (rendering with QueryClientProvider mock). These are intentional — the export test confirms the component loads correctly. Full tests deferred to post-integration phase.
• animate-cursor-blink CSS animation assumed to exist in ui/src/index.css (created by plan 22-00 which runs in parallel). If not present, the cursor will display statically but without the blink animation.

Self-Check: PASSED

All 7 created files confirmed to exist. Commits 91aa9d65 (Task 1) and 471efdfd (Task 2) both verified in git log.