feat(examples-chat): Phase 2B — tool calls + citations#220
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…+ attach_citations)
Layers tool calls and citations onto the canonical demo by extending the python graph from a single-node generate to a ReAct-style loop with a dedicated tools node and a terminal attach_citations post-process. One welcome suggestion exercises both surfaces. The chat composition auto-renders both <chat-tool-calls> (auto-mounted in <chat>) and <chat-citations> (auto-mounted in <chat-message>) so the Angular UI surface needs no changes. Phase 2B is ~120 LOC mostly Python: hardcoded 5-document corpus, search_documents tool, should_continue conditional, ToolNode wiring, attach_citations node (uses RemoveMessage + AIMessage with same id to attach additional_kwargs.citations from the most recent ToolMessage batch). Two pytest smokes pin graph topology and tool return shape. CHECKLIST gets two newly populated sections. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Five-phase plan: branch; python TDD (failing topology + tool tests then implement corpus + tool + ReAct loop + attach_citations terminal node); welcome suggestion entry; CHECKLIST additions; verification + PR. ~120 LOC, 3 commits. Server-side probe verifies tool flow ends with an AI message carrying additional_kwargs.citations. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Layers tool calls and citations onto the canonical demo by extending the python graph from a single-node
generateinto a ReAct-style loop with a dedicatedtoolsnode and a terminalattach_citationspost-process.__start__ → generate → [tool_calls?] → tools → generate (loop)or→ attach_citations → __end__. Hardcoded 5-document Angular corpus (signals, RxJS interop, control flow, standalone, zoneless) + asearch_documentstool. Theattach_citationsnode walks back to the most recent ToolMessage, parses its JSON content, and replaces the final AI message with one carryingadditional_kwargs.citationspopulated (RemoveMessage + AIMessage with same id — standard LangGraph in-place edit pattern).The chat composition's
<chat-tool-calls>and<chat-citations>primitives already auto-render — no Angular UI changes needed. The@ngaf/langgraphadapter already populatesMessage.toolCallsfromtool_calls/ToolMessage pairs andMessage.citationsfromadditional_kwargs.citations.System prompt extended to encourage tool use on Angular topics with inline
[1],[2]citations.Spec:
docs/superpowers/specs/2026-05-08-canonical-chat-demo-phase-2b-tools-citations-design.mdPlan:
docs/superpowers/plans/2026-05-08-canonical-chat-demo-phase-2b-tools-citations.mdPhase 3+ (interrupts, subagents, generative UI, time travel, multi-thread) are separate spec/plan/PR cycles.
Test plan
Verified locally
nx run examples-chat-python:smoke— 4 passed (2 existing + 2 new)nx run examples-chat-angular:test— 9 passednx run examples-chat-angular:lint— 0 errorsnx run examples-chat-angular:build— succeeds (development)additional_kwargs.citationspopulated with 3 distinct sources (Signals — Angular guide, RxJS interop with signals, Built-in control flow).Pending visual verification
examples/chatdemo. Tool-call card renders during streaming, collapses to "complete" pill; sources panel renders below the response with citations; inline[1],[2]markers in message body link to sources.(Visual sweep continues against issue #214; rolls together with the next iteration.)