feat: add Chat module with TanStack AI streaming and RAG#95
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antosubash merged 6 commits intomainfrom Apr 8, 2026
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New user-facing Chat module layered on top of the Agents framework: conversations UI, multi-turn history, and automatic RAG augmentation via the existing agent pipeline. - Chat module (Contracts + impl + tests) with per-user conversations, permissions (Chat.View/Create/ManageAll), and IChatContracts for cross-module access - Streaming endpoint emits the @tanstack/ai SSE protocol (content/done/error chunks); Conversation.tsx uses useChat via fetchServerSentEvents - Graceful mid-stream error handling: LLM failures surface as TanStack error chunks and partial replies are still persisted - Framework: AgentChatRequest gains optional History; PrepareAgentCallAsync replays prior turns so multi-turn conversations have context - Shared test factory registers ChatDbContext - 74 tests (unit + HTTP integration + streaming wire-format)
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Summary
New user-facing Chat module layered on top of the existing Agents framework — conversations UI, multi-turn history, automatic RAG augmentation, and streaming replies over the @tanstack/ai SSE protocol.
modules/Chat): Contracts + impl + DbContext with per-userConversation/ChatMessagepersistence,IChatContractsfor cross-module use,ChatPermissions(View/Create/ManageAll), seven REST endpoints for CRUD + message history, one SSE streaming endpoint./api/chat/conversations/{id}/streamendpoint emits TanStackcontent/done/errorchunks. Mid-stream LLM failures are delivered aserrorframes and any partial assistant text is still persisted.Pages/Conversation.tsx): usesuseChatfrom@tanstack/ai-reactwithfetchServerSentEvents; seedsinitialMessagesfrom server props.Pages/Browse.tsxlists conversations and creates new ones via an agent picker.framework/SimpleModule.Agents):AgentChatRequestgains an optionalHistorycollection;PrepareAgentCallAsyncreplays prior turns so multi-turn conversations have context. Backwards-compatible (defaultnull) — existing Agents-module callers unaffected.tests/SimpleModule.Tests.Shared): registersChatDbContextso integration tests can hit the Chat module through the real HTTP pipeline.Test plan
dotnet build template/SimpleModule.Host— 0 errors (source generator discovers[Module("Chat")], no SM00xx diagnostics)dotnet test modules/Chat/tests/SimpleModule.Chat.Tests— 74 tests passingChatServiceTests(29),TanStackDtoSerializationTests(6),ConversationIdTests+ChatMessageIdTests(7),AgentHistoryReplayTests(5 — proves framework history replay with a fakeIChatClient)ChatEndpointTests(17 — CRUD over HTTP, auth, permission, multi-user isolation),ChatStreamingEndpointTests(10 — SSE wire format parsing, persistence, history forwarding, error frames)dotnet test modules/Products/tests/SimpleModule.Products.Tests— 39/39 still passing (sanity-check the shared-factory edits)dotnet run --project template/SimpleModule.Host, navigate to/chat, pick an agent, send a message and confirm the response streams token-by-tokenEnableRag/RagCollectionName)Notes
routes.tsregeneration is the only auto-generated churn in the diff.@tanstack/ai-react/@tanstack/ai-clientare declared as^0.1.0inmodules/Chat/src/SimpleModule.Chat/package.json— pin to the latest real version during review if needed.