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Merged
blove merged 1 commit into from
Apr 12, 2026
Merged

fix(chat): route chat examples through streaming backend #121

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2 changes: 1 addition & 1 deletion cockpit/chat/a2ui/angular/src/environments/environment.development.ts
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
export const environment = {
production: false,
langGraphApiUrl: 'http://localhost:4511/api',
a2uiAssistantId: 'c-a2ui',
a2uiAssistantId: 'a2ui_form',
};
2 changes: 1 addition & 1 deletion cockpit/chat/a2ui/angular/src/environments/environment.ts
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
export const environment = {
production: true,
langGraphApiUrl: '/api',
a2uiAssistantId: 'c-a2ui',
a2uiAssistantId: 'a2ui_form',
};
123 changes: 64 additions & 59 deletions cockpit/langgraph/streaming/python/src/a2ui_graph.py
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@@ -1,8 +1,13 @@
"""
A2UI Contact Form Graph

Demonstrates the A2UI (Agent-to-UI) protocol by streaming JSONL that
builds an interactive contact form on the Angular frontend.
Demonstrates the A2UI (Agent-to-UI) protocol by emitting hardcoded JSONL
that builds an interactive contact form on the Angular frontend.
Uses the v0.9 envelope format: {"createSurface": {...}}.

The graph does NOT use an LLM for UI generation — A2UI JSONL requires
exact format adherence that LLMs cannot reliably provide. The LLM is
only used for conversational responses to form submission events.
"""

import json
Expand All @@ -11,83 +16,83 @@

A2UI_PREFIX = "---a2ui_JSON---"

# v0.9 envelope format: each message is {"<type>": {<payload>}}
CONTACT_FORM_JSONL = A2UI_PREFIX + "\n" + "\n".join([
json.dumps({"type": "createSurface", "surfaceId": "contact", "catalogId": "basic"}),
json.dumps({"type": "updateDataModel", "surfaceId": "contact", "value": {
"name": "", "email": "", "department": "Engineering", "consent": False,
json.dumps({"createSurface": {
"surfaceId": "contact", "catalogId": "basic", "sendDataModel": True,
}}),
json.dumps({"updateDataModel": {
"surfaceId": "contact",
"value": {"name": "", "email": "", "department": "Engineering", "consent": False},
}}),
json.dumps({"updateComponents": {
"surfaceId": "contact",
"components": [
{"id": "root", "component": "Column", "children": ["card"]},
{"id": "card", "component": "Card", "title": "Contact Us", "children": [
"name_field", "email_field", "dept_picker", "consent_check", "divider", "submit_btn",
]},
{"id": "name_field", "component": "TextField",
"label": "Name", "value": {"path": "/name"}, "placeholder": "Your full name",
"checks": [
{"condition": {"call": "required", "args": {"value": {"path": "/name"}}},
"message": "Name is required"},
]},
{"id": "email_field", "component": "TextField",
"label": "Email", "value": {"path": "/email"}, "placeholder": "you@company.com",
"checks": [
{"condition": {"call": "required", "args": {"value": {"path": "/email"}}},
"message": "Email is required"},
{"condition": {"call": "email", "args": {"value": {"path": "/email"}}},
"message": "Must be a valid email address"},
]},
{"id": "dept_picker", "component": "ChoicePicker",
"label": "Department",
"options": ["Engineering", "Sales", "Support", "Marketing"],
"selected": {"path": "/department"}},
{"id": "consent_check", "component": "CheckBox",
"label": "I agree to be contacted", "checked": {"path": "/consent"}},
{"id": "divider", "component": "Divider"},
{"id": "submit_btn", "component": "Button",
"label": "Submit",
"checks": [
{"condition": {"call": "and", "args": {"values": [
{"call": "required", "args": {"value": {"path": "/name"}}},
{"call": "email", "args": {"value": {"path": "/email"}}},
{"path": "/consent"},
]}},
"message": "Complete all required fields and agree to be contacted"},
],
"action": {"event": {"name": "formSubmit", "context": {"formId": "contact"}}}},
],
}}),
json.dumps({"type": "updateComponents", "surfaceId": "contact", "components": [
{"id": "root", "component": "Column", "children": ["card"]},
{"id": "card", "component": "Card", "title": "Contact Us", "children": [
"name_field", "email_field", "dept_picker", "consent_check", "divider", "submit_btn",
]},
{"id": "name_field", "component": "TextField",
"label": "Name", "value": {"path": "/name"}, "placeholder": "Your full name",
"_bindings": {"value": "/name"},
"checks": [
{"condition": {"call": "required", "args": {"value": {"path": "/name"}}},
"message": "Name is required"},
]},
{"id": "email_field", "component": "TextField",
"label": "Email", "value": {"path": "/email"}, "placeholder": "you@company.com",
"_bindings": {"value": "/email"},
"checks": [
{"condition": {"call": "required", "args": {"value": {"path": "/email"}}},
"message": "Email is required"},
{"condition": {"call": "email", "args": {"value": {"path": "/email"}}},
"message": "Must be a valid email address"},
]},
{"id": "dept_picker", "component": "ChoicePicker",
"label": "Department",
"options": ["Engineering", "Sales", "Support", "Marketing"],
"selected": {"path": "/department"},
"_bindings": {"selected": "/department"}},
{"id": "consent_check", "component": "CheckBox",
"label": "I agree to be contacted", "checked": {"path": "/consent"},
"_bindings": {"checked": "/consent"}},
{"id": "divider", "component": "Divider"},
{"id": "submit_btn", "component": "Button",
"label": "Submit",
"checks": [
{"condition": {"call": "and", "args": {"values": [
{"call": "required", "args": {"value": {"path": "/name"}}},
{"call": "email", "args": {"value": {"path": "/email"}}},
{"path": "/consent"},
]}},
"message": "Complete all required fields and agree to be contacted"},
],
"action": {"event": {"name": "formSubmit", "context": {"formId": "contact"}}}},
]}),
])


def build_a2ui_graph():
"""
Two-node graph:
- create_form: emits the A2UI contact form surface
- handle_event: responds to form submission events
Single-node graph:
- On first message: emits hardcoded A2UI JSONL for the contact form
- On a2ui_event messages: responds with a confirmation message
"""

async def create_form(state: MessagesState) -> dict:
last = state["messages"][-1]

# If this is an a2ui_event, route to event handling
# Check if this is a form submission event from the A2UI surface
try:
payload = json.loads(last.content)
if isinstance(payload, dict) and payload.get("type") == "a2ui_event":
return await handle_event(state, payload)
name = payload.get("context", {}).get("formId", "unknown")
return {"messages": [AIMessage(
content=f"Thanks for submitting the **{name}** form! We'll be in touch soon.",
)]}
except (json.JSONDecodeError, AttributeError):
pass

# First message — emit the contact form
# Any other message — emit the contact form
return {"messages": [AIMessage(content=CONTACT_FORM_JSONL)]}

async def handle_event(state: MessagesState, payload: dict) -> dict:
name = payload.get("context", {}).get("formId", "unknown")
return {"messages": [AIMessage(
content=f"Thanks for submitting the **{name}** form! We'll be in touch soon.",
)]}

graph = StateGraph(MessagesState)
graph.add_node("create_form", create_form)
graph.set_entry_point("create_form")
Expand Down
25 changes: 13 additions & 12 deletions scripts/examples-middleware.ts
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Expand Up @@ -60,18 +60,19 @@ const PATH_TO_KEY: Record<string, string> = {
'deep-agents/memory': 'da-memory',
'deep-agents/skills': 'skills',
'deep-agents/sandboxes': 'sandboxes',
// Chat capabilities
'chat/a2ui': 'c-a2ui',
'chat/debug': 'c-debug',
'chat/generative-ui': 'c-generative-ui',
'chat/input': 'c-input',
'chat/interrupts': 'c-interrupts',
'chat/messages': 'c-messages',
'chat/subagents': 'c-subagents',
'chat/theming': 'c-theming',
'chat/threads': 'c-threads',
'chat/timeline': 'c-timeline',
'chat/tool-calls': 'c-tool-calls',
// Chat capabilities — routed through the streaming deployment which has
// all chat graphs consolidated in its langgraph.json (PR #113).
'chat/a2ui': 'streaming',
'chat/debug': 'streaming',
'chat/generative-ui': 'streaming',
'chat/input': 'streaming',
'chat/interrupts': 'streaming',
'chat/messages': 'streaming',
'chat/subagents': 'streaming',
'chat/theming': 'streaming',
'chat/threads': 'streaming',
'chat/timeline': 'streaming',
'chat/tool-calls': 'streaming',
// Render capabilities
'render/computed-functions': 'r-computed-functions',
'render/element-rendering': 'r-element-rendering',
Expand Down
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