nexus/.planning/phases/22-agent-streaming/22-00-SUMMARY.md

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phase: 22-agent-streaming plan: "00" subsystem: database, ui, testing tags: [drizzle, tailwind, tanstack-virtual, vitest, chat, agent-roles]

Dependency graph

requires:

• phase: 21-chat-foundation provides: chat_messages schema, ChatMessage type, existing chat UI components provides:
• updatedAt column on chat_messages table (migration 0048)
• updatedAt field on ChatMessage shared type
• @tanstack/react-virtual installed in ui workspace
• agentRoleColors utility with 11 distinct themed role colors (THEME-03)
• agentRoleColorDefault fallback
• cursor-blink CSS animation with reduced-motion guard
• 7 Wave 0 test stub files for Phase 22 components/hooks affects: [22-01, 22-02, 22-03, 22-04, 22-05]

Tech tracking

tech-stack: added: ["@tanstack/react-virtual"] patterns: ["agent-role-colors utility (Record<AgentRole, string> with light+dark variants)", "it.todo() Wave 0 test scaffolding (established in Phase 21)"]

key-files: created: - packages/db/src/migrations/0048_add_chat_messages_updated_at.sql - ui/src/lib/agent-role-colors.ts - ui/src/lib/agent-role-colors.test.ts - ui/src/hooks/useStreamingChat.test.ts - ui/src/components/ChatAgentSelector.test.tsx - ui/src/components/ChatMessage.test.tsx - ui/src/components/ChatSlashCommandPopover.test.tsx - ui/src/components/ChatMentionPopover.test.tsx - ui/src/components/ChatMessageIdentityBar.test.tsx - ui/src/components/ChatMessageList.test.tsx modified: - packages/db/src/schema/chat_messages.ts - packages/shared/src/types/chat.ts - ui/src/index.css - ui/package.json

key-decisions:

• "THEME-03: 11 agent roles each assigned a unique Tailwind color class — pm=blue, engineer=violet, ceo=amber, general=slate, designer=pink, qa=orange, researcher=teal, devops=emerald, cto=indigo, cmo=rose, cfo=cyan"
• "updatedAt on chat_messages is nullable (no .notNull()) — existing rows will have null until updated"

patterns-established:

• "agentRoleColors pattern: Record<AgentRole, string> with 'text-X-600 dark:text-X-400' dual-variant format, mirrors status-colors.ts convention"
• "CSS animation pattern: @keyframes + .animate-* class + @media prefers-reduced-motion guard"

requirements-completed: [THEME-03]

Metrics

duration: 8min completed: 2026-04-01

Phase 22 Plan 00: Wave 0 Foundation Summary

DB migration adding updated_at to chat_messages, ChatMessage type update, @tanstack/react-virtual install, 11-role agent-role-colors utility (THEME-03), cursor-blink CSS animation, and 7 Wave 0 test stubs

Performance

• Duration: 8 min
• Started: 2026-04-01T18:05:00Z
• Completed: 2026-04-01T18:13:00Z
• Tasks: 2
• Files modified: 14

Accomplishments

• chat_messages schema and migration 0048 add nullable updated_at column
• @tanstack/react-virtual installed and ChatMessage type updated with updatedAt: string | null
• agent-role-colors.ts covers all 11 AgentRole values with visually distinct colors (THEME-03 — no two roles share a color), tested with 4-test suite
• cursor-blink CSS animation with prefers-reduced-motion guard added to index.css
• 7 test stub files created covering all Phase 22 components and hooks

Task Commits

Each task was committed atomically:

1. Task 1: DB migration, shared types, react-virtual, agent-role-colors, CSS animation - 96b27119 (feat)
2. Task 2: Wave 0 test stubs for Phase 22 components/hooks - baba7e3a (test)

Files Created/Modified

• packages/db/src/migrations/0048_add_chat_messages_updated_at.sql - ALTER TABLE to add updated_at with DEFAULT now()
• packages/db/src/schema/chat_messages.ts - Added updatedAt column (nullable timestamp)
• packages/shared/src/types/chat.ts - Added updatedAt: string | null to ChatMessage interface
• ui/package.json - Added @tanstack/react-virtual dependency
• ui/src/lib/agent-role-colors.ts - Record<AgentRole, string> with 11 distinct light+dark color pairs
• ui/src/lib/agent-role-colors.test.ts - 4 tests: coverage, dark variants, default, uniqueness
• ui/src/index.css - cursor-blink keyframes + .animate-cursor-blink + reduced-motion guard
• ui/src/hooks/useStreamingChat.test.ts - 5 it.todo() stubs
• ui/src/components/ChatAgentSelector.test.tsx - 5 it.todo() stubs
• ui/src/components/ChatMessage.test.tsx - 8 it.todo() stubs
• ui/src/components/ChatSlashCommandPopover.test.tsx - 5 it.todo() stubs
• ui/src/components/ChatMentionPopover.test.tsx - 4 it.todo() stubs
• ui/src/components/ChatMessageIdentityBar.test.tsx - 4 it.todo() stubs
• ui/src/components/ChatMessageList.test.tsx - 5 it.todo() stubs

Decisions Made

• THEME-03: Each of the 11 roles gets a unique hue family — pm=blue, engineer=violet, ceo=amber, general=slate, designer=pink, qa=orange, researcher=teal, devops=emerald, cto=indigo, cmo=rose, cfo=cyan. Previous plans had duplicates (ceo+general yellow, etc.) which this corrects.
• updatedAt nullable (no .notNull()): existing rows left as null until touched, prevents data migration requirement.

Deviations from Plan

None - plan executed exactly as written.

Issues Encountered

None — all acceptance criteria met on first attempt. TypeScript type check passes clean.

Known Stubs

None — test stubs are intentional Wave 0 scaffolding (it.todo pattern), not data stubs. All 7 stub files will be implemented in Plans 22-01 through 22-05.

Next Phase Readiness

• All Wave 0 foundations in place for Phase 22 Plans 01-05
• agent-role-colors.ts ready for ChatMessageIdentityBar (Plan 22-03)
• @tanstack/react-virtual ready for ChatMessageList virtualization (Plan 22-04)
• cursor-blink animation ready for ChatStreamingCursor (Plan 22-02)
• DB migration 0048 ready for server-side streaming response inclusion of updatedAt

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Phase: 22-agent-streaming Completed: 2026-04-01

Self-Check: PASSED

All files verified present. Both task commits (96b27119, baba7e3a) verified in git log.