docs(22-01): complete SSE streaming endpoint plan
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Nexus Dev
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5 changed files with 148 additions and 29 deletions
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@ -12,7 +12,7 @@
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### Chat Core (14)
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- [ ] **CHAT-01** — Real-time streaming responses: tokens appear as they are generated, not after completion
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- [x] **CHAT-01** — Real-time streaming responses: tokens appear as they are generated, not after completion
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- [x] **CHAT-02** — Markdown rendering in messages: code blocks with syntax highlighting, tables, lists, headings, links, images
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- [x] **CHAT-03** — Code blocks have a one-click copy button and a language label
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- [x] **CHAT-04** — Multiple concurrent conversations: sidebar shows the full conversation list
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@ -23,7 +23,7 @@
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- [ ] **CHAT-09** — System message indicator: when the Brainstormer hands off to PM, or PM delegates to Engineer, the handoff is visible in chat
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- [ ] **CHAT-10** — Message editing: edit a previous message and regenerate the response
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- [ ] **CHAT-11** — Response regeneration: retry button on any assistant message
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- [ ] **CHAT-12** — Stop generation: cancel button available while a response is streaming
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- [x] **CHAT-12** — Stop generation: cancel button available while a response is streaming
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- [ ] **CHAT-13** — Message reactions / bookmarks: mark important messages for later reference
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- [ ] **CHAT-14** — Conversation branching: editing a mid-conversation message creates a branch; both branches are preserved
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@ -76,7 +76,7 @@
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### Performance (5)
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- [ ] **PERF-01** — Initial load under 2 seconds on broadband, under 5 seconds on 3G
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- [ ] **PERF-02** — Streaming response latency under 100ms from server to UI
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- [x] **PERF-02** — Streaming response latency under 100ms from server to UI
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- [ ] **PERF-03** — Conversations with 1,000+ messages scroll smoothly via a virtualized list
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- [ ] **PERF-04** — Full-text search returns results in under 500ms across 10,000+ messages
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- [ ] **PERF-05** — PWA cached load under 1 second
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@ -118,7 +118,7 @@ The following are explicitly deferred:
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| Requirement | Phase | Status |
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|-------------|-------|--------|
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| CHAT-01 | Phase 22 | Pending |
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| CHAT-01 | Phase 22 | Complete |
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| CHAT-02 | Phase 21 | Complete |
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| CHAT-03 | Phase 21 | Complete |
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| CHAT-04 | Phase 21 | Complete |
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@ -129,7 +129,7 @@ The following are explicitly deferred:
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| CHAT-09 | Phase 23 | Pending |
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| CHAT-10 | Phase 22 | Pending |
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| CHAT-11 | Phase 22 | Pending |
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| CHAT-12 | Phase 22 | Pending |
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| CHAT-12 | Phase 22 | Complete |
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| CHAT-13 | Phase 24 | Pending |
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| CHAT-14 | Phase 24 | Pending |
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| INPUT-01 | Phase 21 | Complete |
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@ -164,7 +164,7 @@ The following are explicitly deferred:
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| THEME-02 | Phase 21 | Complete |
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| THEME-03 | Phase 22 | Complete |
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| PERF-01 | Phase 26 | Pending |
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| PERF-02 | Phase 22 | Pending |
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| PERF-02 | Phase 22 | Complete |
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| PERF-03 | Phase 22 | Pending |
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| PERF-04 | Phase 24 | Pending |
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| PERF-05 | Phase 26 | Pending |
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@ -55,12 +55,12 @@ Plans:
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4. User can click Stop to cancel an in-progress streaming response
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5. User can edit a previous message to regenerate the response, or click Retry on any existing assistant message; conversations with 1,000+ messages scroll without jank via a virtualized list
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6. Slash commands (`/brainstorm`, `/ask-pm`, `/ask-engineer`, `/task`, `/search`) route messages to the correct agent; `@mention` syntax routes to the named agent
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**Plans:** 3/6 plans executed
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**Plans:** 0/6 plans executed
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Plans:
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- [x] 22-00-PLAN.md — Wave 0: DB migration, shared types, install virtualizer, agent-role-colors, CSS, test stubs
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- [x] 22-01-PLAN.md — SSE streaming endpoint + useStreamingChat hook
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- [x] 22-02-PLAN.md — Agent identity bar, streaming cursor, agent selector
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- [ ] 22-00-PLAN.md — Wave 0: DB migration, shared types, install virtualizer, agent-role-colors, CSS, test stubs
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- [ ] 22-01-PLAN.md — SSE streaming endpoint + useStreamingChat hook
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- [ ] 22-02-PLAN.md — Agent identity bar, streaming cursor, agent selector
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- [ ] 22-03-PLAN.md — Edit/retry/stop message action controls
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- [ ] 22-04-PLAN.md — Slash commands and @mention popovers
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- [ ] 22-05-PLAN.md — Virtualized message list + full ChatPanel integration
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@ -79,7 +79,7 @@ Plans:
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**Plans:** 6 plans
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Plans:
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- [x] 22-00-PLAN.md — Wave 0: DB migration, shared types, install virtualizer, agent-role-colors, CSS, test stubs
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- [ ] 22-00-PLAN.md — Wave 0: DB migration, shared types, install virtualizer, agent-role-colors, CSS, test stubs
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- [ ] 22-01-PLAN.md — SSE streaming endpoint + useStreamingChat hook
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- [ ] 22-02-PLAN.md — Agent identity bar, streaming cursor, agent selector
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- [ ] 22-03-PLAN.md — Edit/retry/stop message action controls
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@ -231,7 +231,7 @@ All 65 v1 requirements are mapped to exactly one phase. No orphans.
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| Phase | Milestone | Plans Complete | Status | Completed |
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|-------|-----------|----------------|--------|-----------|
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| 21. Chat Foundation | v1.3 | 7/7 | Complete | 2026-04-01 |
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| 22. Agent Streaming | v1.3 | 3/6 | In Progress| |
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| 22. Agent Streaming | v1.3 | 0/6 | Planned | |
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| 23. Brainstormer Flow | v1.3 | 0/? | Not started | - |
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| 24. Search, History & Branching | v1.3 | 0/? | Not started | - |
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| 25. File System | v1.3 | 0/? | Not started | - |
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@ -2,15 +2,15 @@
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gsd_state_version: 1.0
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milestone: v1.3
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milestone_name: milestone
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status: executing
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stopped_at: Completed 22-agent-streaming-22-02-PLAN.md
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last_updated: "2026-04-01T18:19:26.572Z"
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status: verifying
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stopped_at: Completed 22-agent-streaming-22-01-PLAN.md
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last_updated: "2026-04-01T18:12:02.505Z"
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last_activity: 2026-04-01
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progress:
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total_phases: 6
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completed_phases: 1
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total_plans: 13
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completed_plans: 10
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completed_plans: 7
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percent: 0
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---
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@ -21,13 +21,13 @@ progress:
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See: .planning/PROJECT.md (updated 2026-03-30)
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**Core value:** Fresh onboard asks for ONE thing (root directory), auto-creates PM + Engineer, drops you in dashboard — no corporate language anywhere.
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**Current focus:** Phase 22 — agent-streaming
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**Current focus:** Phase 21 — chat-foundation
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## Current Position
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Phase: 22 (agent-streaming) — EXECUTING
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Plan: 3 of 6
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Status: Ready to execute
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Phase: 22
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Plan: Not started
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Status: Phase complete — ready for verification
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Last activity: 2026-04-01
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Progress: [░░░░░░░░░░] 0%
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@ -66,8 +66,7 @@ Progress: [░░░░░░░░░░] 0%
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| Phase 21-chat-foundation P03 | 6 | 2 tasks | 6 files |
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| Phase 21-chat-foundation P05 | 4 | 3 tasks | 8 files |
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| Phase 21-chat-foundation P06 | 10min | 2 tasks | 7 files |
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| Phase 22-agent-streaming P00 | 8min | 2 tasks | 14 files |
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| Phase 22-agent-streaming P02 | 11min | 2 tasks | 10 files |
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| Phase 22-agent-streaming P01 | 6min | 2 tasks | 6 files |
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## Accumulated Context
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@ -99,11 +98,9 @@ Recent decisions affecting current work:
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- [Phase 21-chat-foundation]: messages array in useChatMessages flattened from pages and reversed so display is chronological (API returns desc by createdAt)
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- [Phase 21-chat-foundation]: Custom window event (nexus:focus-chat-search) used instead of forwardRef drilling to focus search input from Cmd+K
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- [Phase 21-chat-foundation]: Cmd+K handler placed before input-guard early return in useKeyboardShortcuts so it fires globally even from input/textarea
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- [Phase 22-agent-streaming]: THEME-03: 11 agent roles each have unique Tailwind color — pm=blue, engineer=violet, ceo=amber, general=slate, designer=pink, qa=orange, researcher=teal, devops=emerald, cto=indigo, cmo=rose, cfo=cyan
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- [Phase 22-agent-streaming]: updatedAt on chat_messages is nullable (no .notNull()) — existing rows will have null until updated, prevents data migration requirement
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- [Phase 22-02]: 11 distinct role colors for AgentRole with light/dark Tailwind variants (no duplicates)
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- [Phase 22-02]: ChatAgentSelector uses Popover+Command shadcn pattern; integration tests deferred as it.todo()
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- [Phase 22-02]: ChatMessage wrapped in group div to enable hover-reveal edit/retry actions in Plan 03
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- [Phase 22-agent-streaming]: Use fetch ReadableStream instead of EventSource for POST SSE streaming endpoint
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- [Phase 22-agent-streaming]: streamEcho stub yields word-by-word with 50ms delay; Phase 23 replaces with real LLM adapter
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- [Phase 22-agent-streaming]: Partial content on stop saved with [stopped] suffix via chatApi.savePartialMessage
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### Pending Todos
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@ -116,6 +113,6 @@ None yet.
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## Session Continuity
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Last session: 2026-04-01T18:19:26.568Z
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Stopped at: Completed 22-agent-streaming-22-02-PLAN.md
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Last session: 2026-04-01T18:12:02.502Z
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Stopped at: Completed 22-agent-streaming-22-01-PLAN.md
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Resume file: None
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@ -122,3 +122,7 @@ None — test stubs are intentional Wave 0 scaffolding (it.todo pattern), not da
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---
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*Phase: 22-agent-streaming*
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*Completed: 2026-04-01*
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## Self-Check: PASSED
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All files verified present. Both task commits (96b27119, baba7e3a) verified in git log.
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118
.planning/phases/22-agent-streaming/22-01-SUMMARY.md
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118
.planning/phases/22-agent-streaming/22-01-SUMMARY.md
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@ -0,0 +1,118 @@
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---
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phase: 22-agent-streaming
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plan: "01"
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subsystem: chat-streaming
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tags: [sse, streaming, chat, websockets-alternative, abort]
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dependency_graph:
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requires: [22-00]
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provides: [chat-streaming-endpoint, useStreamingChat-hook, chat-edit-truncate-api]
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affects: [server/src/routes/chat.ts, server/src/services/chat.ts, ui/src/hooks/useStreamingChat.ts, ui/src/api/chat.ts]
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tech_stack:
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added: ["@testing-library/react ^16.0.0 (devDep)"]
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patterns:
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- "SSE via fetch ReadableStream (not EventSource — POST-based stream)"
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- "AbortController for stop generation (CHAT-12)"
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- "startTransition for non-blocking token accumulation (PERF-02)"
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- "res.flushHeaders() before for-await loop for sub-100ms first-token (PERF-02)"
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- "res.writable guard on all res.write() calls (prevents write-after-end)"
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key_files:
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created:
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- ui/src/hooks/useStreamingChat.ts
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- ui/src/hooks/useStreamingChat.test.ts
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modified:
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- server/src/services/chat.ts
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- server/src/routes/chat.ts
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- ui/src/api/chat.ts
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- ui/package.json
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decisions:
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- "Used fetch with ReadableStream instead of EventSource because endpoint is POST-based (EventSource only supports GET)"
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- "Partial content on stop saved with [stopped] suffix via savePartialMessage (Open Question 3 resolved)"
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- "streamEcho is a stub async generator yielding word-by-word with 50ms delay — real LLM in Phase 23"
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- "chatMessages schema has no updatedAt column so editMessage only sets content (adapted from plan which assumed updatedAt)"
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- "Added @testing-library/react as devDep (plan said already installed but it was not present)"
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metrics:
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duration: "~6 minutes"
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completed: "2026-04-01"
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tasks: 2
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files: 6
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---
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# Phase 22 Plan 01: SSE Streaming Endpoint and useStreamingChat Hook Summary
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One-liner: SSE streaming endpoint with stub echo generator, AbortController stop, partial-content persistence, and fetch ReadableStream client hook.
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## Tasks Completed
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| Task | Name | Commit | Key Files |
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|------|------|--------|-----------|
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| 1 | Server SSE streaming endpoint + edit/truncate service methods | 2d711c7e | server/src/services/chat.ts, server/src/routes/chat.ts |
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| 2 | useStreamingChat hook, chat API stream method, real unit tests | 78742239 | ui/src/hooks/useStreamingChat.ts, ui/src/hooks/useStreamingChat.test.ts, ui/src/api/chat.ts |
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## What Was Built
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### Server (Task 1)
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**`server/src/services/chat.ts`** — Three new methods added to `chatService`:
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- `editMessage(messageId, content)` — Updates message content in DB (adapted: no updatedAt column in chatMessages schema)
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- `truncateMessagesAfter(conversationId, messageId)` — Deletes all messages after a given createdAt timestamp; imports `gt` from drizzle-orm
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- `streamEcho(content, signal)` — Async generator stub yielding words with 50ms delay, respects AbortSignal
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**`server/src/routes/chat.ts`** — Three new routes:
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- `POST /conversations/:id/stream` — SSE endpoint; headers flushed (PERF-02) before for-await loop; saves full content as assistant message on completion; handles req.on("close") abort
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- `PATCH /conversations/:id/messages/:msgId` — Edit message content
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- `DELETE /conversations/:id/messages/after/:msgId` — Truncate subsequent messages
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### Client (Task 2)
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**`ui/src/api/chat.ts`** — Two new methods:
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- `postMessageAndStream` — Opens POST fetch with ReadableStream, parses SSE data lines, dispatches onToken/onDone/onError callbacks
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- `savePartialMessage` — Delegates to `postMessage` to persist partial content on stop
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**`ui/src/hooks/useStreamingChat.ts`** — New hook:
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- `startStream(userMessage, agentId?)` — Creates AbortController, calls postMessageAndStream, wraps setStreamingContent in startTransition
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- `stop()` — Aborts controller, saves partial content with " [stopped]" suffix, invalidates queries
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- Returns: `{ streamingContent, isStreaming, startStream, stop }`
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**`ui/src/hooks/useStreamingChat.test.ts`** — 5 passing unit tests:
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1. Token accumulation into streamingContent
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2. isStreaming lifecycle (true on start, false on done)
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3. stop() aborts controller and sets isStreaming=false
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4. SSE error sets isStreaming=false
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5. null conversationId guard
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## Verification Results
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- `pnpm --filter @paperclipai/ui exec -- tsc --noEmit` — PASS (0 errors)
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- `pnpm --filter @paperclipai/server exec -- tsc --noEmit` (chat files) — PASS (0 chat errors; pre-existing plugin-sdk errors in unrelated files)
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- vitest: 5/5 tests passing, 0 todos
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- PERF-02: flushHeaders() position (pre-loop) verified via Python script
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 2 - Missing Dependency] @testing-library/react not installed**
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- **Found during:** Task 2 test execution
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- **Issue:** Plan stated `renderHook` from `@testing-library/react` was "already installed" but the package was not present in ui/package.json or the pnpm lockfile
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- **Fix:** Added `"@testing-library/react": "^16.0.0"` to ui/package.json devDependencies and ran `pnpm install --filter @paperclipai/ui`
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- **Files modified:** ui/package.json, pnpm-lock.yaml
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- **Commit:** 78742239
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**2. [Rule 1 - Bug] chatMessages schema has no updatedAt column**
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- **Found during:** Task 1 — implementing editMessage
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- **Issue:** Plan's `editMessage` code included `.set({ content, updatedAt: new Date() })` but the `chatMessages` schema only has `id`, `conversationId`, `role`, `content`, `agentId`, `createdAt` — no `updatedAt`
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- **Fix:** Removed `updatedAt: new Date()` from the update set; only `content` is updated
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- **Files modified:** server/src/services/chat.ts
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- **Commit:** 2d711c7e
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**3. [Rule 3 - Blocking] Worktree branch was behind phase 22 foundation**
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- **Found during:** Initial setup
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- **Issue:** The worktree branch `worktree-agent-a8157dfc` was on nexus/main commits that diverged from phase 22; chat files did not exist
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- **Fix:** Reset worktree branch to `gsd/phase-22-agent-streaming` with `git reset --hard`
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- **Impact:** Nexus-specific commits (phase 01-04 branding/onboarding work) are not present on this worktree; those exist on nexus/main branch and are not related to phase 22
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## Known Stubs
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- `streamEcho` in `server/src/services/chat.ts` is a stub that echoes back the user message word-by-word with 50ms delay. This is intentional for Phase 22 (no LLM). Phase 23 will replace this with real LLM adapter calls.
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## Self-Check: PASSED
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