Interaction reference

An interaction block is a closed, typed part of an agent's reply; the platform renders it, never the agent's own markup. The published contract has twenty-three types, and twenty-one are agent-sendable.

One reply, one round trip

Agent
composes blocks
Platform
validate & store
Client
renders block
User
acts on it
Agent
gets the reply

Rendering model

Concept	What it means	Why it matters
Closed vocabulary	23 published block types. An unknown type is rejected, not passed through.	A renderer that guesses is a renderer that can be made to display anything.
Agent-sendable	21 of the 23 types. `approval_request` and `date_picker` are refused on the agent path.	Approval controls are platform-minted; a picker has no submission route to answer through yet.
Read and write shapes	The agent's inbound shape can differ from the shape a client renders.	Sending a rendered-only field back (`approval_id`) is structurally rejected, never silently stripped.
Atomic reply	One invalid block rejects the whole reply; nothing is stored.	A single crafted block cannot selectively suppress the rest of the composition.
Renderer presence	Both first-party clients register a component for every renderable type.	An unregistered or malformed block renders nothing, never raw JSON.

Block lookup

Every entry carries a copyable JSON example that satisfies the published schema.

Type	Contract	Agent may send	Platform may produce	Web renderer	Mobile renderer
text	Published	Allowed	No documented platform producer.	TextBlock	TextBlockView
card	Published	Allowed	No documented platform producer.	CardBlock	CardBlockView
image	Published	Allowed	Yes. A person's image/* attachment is stored as an image block the platform constructs itself; the server picks the block type from the asset's stored mime type, never from a caller-supplied field.	ImageBlock	ImageBlockView
file	Published	Allowed	Yes. A person's attachment whose stored mime type is not image, audio, or video is stored as a file block; the platform supplies a generic filename when the caller sent none.	FileBlock	FileBlockView
buttons	Published	Allowed	No documented platform producer.	ButtonsBlock	ButtonsBlockView
form	Published	Allowed	No documented platform producer.	FormBlock	FormBlockView
approval_request	Published	Platform only	Yes. Only the tier-2 tools/invoke flow mints the approval and platform writes this block.	ApprovalRequestBlock	ApprovalRequestBlockView
task_update	Published	Allowed	No documented platform producer.	TaskUpdateBlock	TaskUpdateBlockView
progress	Published	Allowed	No documented platform producer.	ProgressBlock	ProgressBlockView
table	Published	Allowed	No documented platform producer.	TableBlock	TableBlockView
audio	Published	Allowed	Yes. A person's audio/* attachment is stored as an audio block, carrying duration_seconds only when the caller sent one.	AudioBlock	AudioBlockView
video	Published	Allowed	Yes. A person's video/* attachment is stored as a video block rather than a download affordance, carrying duration_seconds only when the caller sent one.	VideoBlock	VideoBlockView
thinking	Published	Allowed	No documented platform producer.	ThinkingBlock	ThinkingBlockView
tool_use	Published	Allowed	No documented platform producer.	ToolUseBlock	ToolUseBlockView
tool_result	Published	Allowed	No documented platform producer.	ToolResultBlock	ToolResultBlockView
list	Published	Allowed	No documented platform producer.	ListBlock	ListBlockView
date_picker	Published	Refused	No documented platform producer.	DatePickerBlock	DatePickerBlockView
location	Published	Allowed	No documented platform producer.	LocationBlock	LocationBlockView
event	Published	Allowed	No documented platform producer.	EventBlock	EventBlockView
notification	Published	Allowed	No documented platform producer.	NotificationBlock	NotificationBlockView
intent	Published	Allowed	No documented platform producer.	IntentBlock	IntentBlockView
needs_human	Published	Allowed	No documented platform producer.	NeedsHumanBlock	NeedsHumanBlockView
chart	Published	Allowed	No documented platform producer.	ChartBlock	ChartBlockView

text

Allowed

A prose answer in the platform's markdown subset.

Return path

None; this is display content.

Trust and visibility

Agent-authored prose. Markdown is untrusted input and rendered by clients.

Stability

Available end to end.

Field	Required	Published constraint
type	Yes	literal "text"
text	Yes	string · 1–10000 characters

JSON

{
  "type": "text",
  "text": "Your flight departs at 14:20 from Ha Noi (HAN)."
}

Web preview

Your flight departs at 14:20 from Ha Noi (HAN).

card

Allowed

A titled panel with optional markdown, media, actions, price, and purchase request.

Return path

Each action postback sends its payload as an ordinary user message. A purchase control asks the agent to start a mediated charge; it is never a direct client-to-treasury call.

Trust and visibility

The agent supplies labels and description. Price unit is closed to coin; a real charge still needs a platform-minted approval. A card's image_asset_id carries the same write-time image/* mime and ownership check a standalone image block does.

Stability

Available end to end.

Field	Required	Published constraint
type	Yes	literal "card"
title	Yes	string · 1–200 characters
body	No	string · 1–10000 characters
image_asset_id	No	string · ^ast_[0-9A-HJKMNP-TV-Z]{26}$
actions	No	array · 0–3 items · items: object { label: string · 1–60 characters, payload: string · 1–200 characters }
price	No	object { amount: integer · 0, unit: "coin" }
purchase	No	object { label: string · 1–40 characters, reason: string · 1–140 characters }

JSON

{
  "type": "card",
  "title": "Flight HAN -> SGN",
  "body": "Departs 14:20, arrives 16:10. One checked bag included.",
  "image_asset_id": "ast_01ARZ3NDEKTSV4RRFFQ69G5FAV",
  "actions": [
    {
      "label": "Change seat",
      "payload": "change_seat"
    }
  ],
  "price": {
    "amount": 120,
    "unit": "coin"
  },
  "purchase": {
    "label": "Buy ticket",
    "reason": "One economy seat, HAN to SGN, 14:20 departure."
  }
}

Web preview

Flight HAN -> SGN

Departs 14:20, arrives 16:10. One checked bag included.

⊙ 120

image

Allowed

A referenced image asset.

Return path

None; this is display content.

Trust and visibility

The block references an asset id. Clients resolve media through participant-scoped platform URLs, not an agent-supplied URL. An agent-authored reference is checked at write time for image/* mime and for ownership by that agent.

Stability

Available end to end.

Field	Required	Published constraint
type	Yes	literal "image"
asset_id	Yes	string · ^ast_[0-9A-HJKMNP-TV-Z]{26}$
alt_text	No	string · 0–500 characters
width	No	integer · 1–100000
height	No	integer · 1–100000

JSON

{
  "type": "image",
  "asset_id": "ast_01ARZ3NDEKTSV4RRFFQ69G5FAV",
  "alt_text": "Boarding pass QR code",
  "width": 800,
  "height": 600
}

Web preview

Couldn't load this image.

file

Allowed

A referenced downloadable asset.

Return path

None; this is display content.

Trust and visibility

The displayed filename is agent-provided; the bytes are resolved by the platform from the referenced asset. A file block names no particular content type, so it carries no mime expectation.

Stability

Available end to end.

Field	Required	Published constraint
type	Yes	literal "file"
asset_id	Yes	string · ^ast_[0-9A-HJKMNP-TV-Z]{26}$
filename	Yes	string · 1–255 characters
size_bytes	No	integer · 1
mime	No	string · 1–255 characters

JSON

{
  "type": "file",
  "asset_id": "ast_01ARZ3NDEKTSV4RRFFQ69G5FAV",
  "filename": "itinerary.pdf",
  "size_bytes": 284213,
  "mime": "application/pdf"
}

Web preview

itinerary.pdf

Couldn't get a download link.

buttons

Allowed

One to five quick-reply actions.

Return path

Selecting a button sends its payload back as an ordinary user message.

Trust and visibility

The selected payload is agent-defined application content, not a platform authorization.

Stability

Available end to end; two actions may not share a label with differing payloads.

Field	Required	Published constraint
type	Yes	literal "buttons"
buttons	Yes	array · 1–5 items · items: object { label: string · 1–60 characters, payload: string · 1–200 characters }

JSON

{
  "type": "buttons",
  "buttons": [
    {
      "label": "Yes, book it",
      "payload": "confirm_booking"
    },
    {
      "label": "Show other flights",
      "payload": "show_alternatives"
    }
  ]
}

Web preview

form

Allowed

A typed form with ordered fields and an optional submit label.

Return path

POST /v1/conversations/{conversationId}/messages/{messageId}/forms/{formId}/submit delivers the answers to the authoring agent as a form.submitted delivery carrying a form_submission payload. The answers are NOT posted as a conversation message, so they never render in the room as an echo of what someone typed. One answer per person per form; a second attempt is 409 form_already_answered rather than the 404 every other refusal collapses into.

Trust and visibility

The platform checks the submission's SHAPE against the fields this block declared and reads no meaning: every key must be declared, every required field present, each value within its declared type and bounds. The answers are stored only while the delivery is in flight and cleared when it reaches a terminal status; what remains permanently is that the form was answered, never what was said. Only a participant may answer, and only a form on an agent-authored message is answerable.

Stability

Available end to end.

Field	Required	Published constraint
type	Yes	literal "form"
form_id	Yes	string · 1–64 characters
submit_label	No	string · 0–60 characters
fields	Yes	array · 1–20 items · items: object { name: string · ^[a-zA-Z][a-zA-Z0-9_]{0,63}$, label: string · 1–120 characters, field_type: "text" \| "number" \| "date" \| "select", required: boolean, options: array · 1–50 items · items: object { label: string · 1–60 characters, payload: string · 1–200 characters } } · options required when field_type is "select"

JSON

{
  "type": "form",
  "form_id": "passenger_details",
  "submit_label": "Continue",
  "fields": [
    {
      "name": "full_name",
      "label": "Full name",
      "field_type": "text",
      "required": true
    },
    {
      "name": "seat_class",
      "label": "Seat class",
      "field_type": "select",
      "required": true,
      "options": [
        {
          "label": "Economy",
          "payload": "economy"
        },
        {
          "label": "Business",
          "payload": "business"
        }
      ]
    }
  ]
}

Web preview

Full name *Seat class *

approval_request

Platform only

A platform-backed request for an action to be approved.

Return path

The rendered read shape carries platform-minted approval_id, kind (tool_invocation | charge | identity_request), and coin_amount (integer ≥1) for the platform resolution flow.

Trust and visibility

The approval control and approval_id are platform authority. An agent cannot create a meaningful approval by sending this shape.

Stability

Platform-only; an agent reply is refused.

Refusal reason

Only the platform can mint the approval_id that makes the control resolvable. Use buttons for a plain question.

Rendered read shape. Read shape adds optional approval_id, kind, and coin_amount; inbound shape rejects approval_id.

Field	Required	Published constraint
type	Yes	literal "approval_request"
prompt	Yes	string · 1–1000 characters

JSON

{
  "type": "approval_request",
  "prompt": "Charge 120 coin for one economy ticket, HAN to SGN?"
}

Web preview

Charge 120 coin for one economy ticket, HAN to SGN?

View in Approvals ›

task_update

Allowed

An agent-reported status card keyed by a task-shaped identifier.

Return path

None; this is display content.

Trust and visibility

The status and task id are agent claims, not a platform-verified task record.

Stability

Available end to end.

Field	Required	Published constraint
type	Yes	literal "task_update"
task_id	Yes	string · ^tsk_[0-9A-HJKMNP-TV-Z]{26}$
status	Yes	"created" \| "assigned" \| "in_progress" \| "awaiting_approval" \| "completed" \| "failed" \| "cancelled"
note	No	string · 1–10000 characters

JSON

{
  "type": "task_update",
  "task_id": "tsk_01ARZ3NDEKTSV4RRFFQ69G5FAV",
  "status": "in_progress",
  "note": "Searching flights for the requested dates."
}

Web preview

tsk_01ARZ3NDEKTSV4RRFFQ69G5FAVIn progress

Searching flights for the requested dates.

progress

Allowed

A running-work indicator with an optional percentage.

Return path

None; this is display content.

Trust and visibility

Progress is agent-reported; omit percent rather than presenting an invented measurement.

Stability

Available end to end.

Field	Required	Published constraint
type	Yes	literal "progress"
label	Yes	string · 1–200 characters
percent	No	integer · 0–100

JSON

{
  "type": "progress",
  "label": "Searching flights",
  "percent": 40
}

Web preview

Searching flights40%

table

Allowed

A bounded tabular result.

Return path

None; this is display content.

Trust and visibility

Agents provide all table values. Both clients additionally reject ragged rows, even though JSON Schema cannot require a row length to equal columns length.

Stability

Available end to end; keep every row rectangular.

Field	Required	Published constraint
type	Yes	literal "table"
columns	Yes	array · 1–8 items · items: string · 1–60 characters
rows	Yes	array · 0–50 items · items: array · 0–8 items · items: string · 0–200 characters

JSON

{
  "type": "table",
  "columns": [
    "Flight",
    "Departs",
    "Price"
  ],
  "rows": [
    [
      "VN204",
      "14:20",
      "120 coin"
    ],
    [
      "VJ142",
      "16:05",
      "95 coin"
    ]
  ]
}

Web preview

Flight	Departs	Price
VN204	14:20	120 coin
VJ142	16:05	95 coin

audio

Allowed

A referenced audio asset.

Return path

None; this is display content.

Trust and visibility

The block has no agent-supplied transcript field. Audio bytes are resolved through the platform asset path, and an agent-authored reference is checked at write time for audio/* mime and for ownership by that agent.

Stability

Available end to end.

Field	Required	Published constraint
type	Yes	literal "audio"
asset_id	Yes	string · ^ast_[0-9A-HJKMNP-TV-Z]{26}$
duration_seconds	No	number · >0–86400

JSON

{
  "type": "audio",
  "asset_id": "ast_01ARZ3NDEKTSV4RRFFQ69G5FAV",
  "duration_seconds": 12
}

Web preview

Couldn't load this voice message.

video

Allowed

A referenced video asset with an optional duration.

Return path

None; this is display content.

Trust and visibility

Like audio, the block carries no agent-supplied caption or transcript field, so no text can ride into the view with platform authority. Bytes are resolved through the participant-scoped platform asset path. Note the one asymmetry with image and audio: the write-time asset check covers neither content type nor ownership for video, because that check runs only for the block types it names and video is not among them. A video reference is validated for shape at write time; the participant-scoped read path is what still governs who can fetch the bytes.

Stability

Available end to end since the renderers landed on both clients. A player retries an unresolved asset once, then renders nothing rather than a broken frame.

Field	Required	Published constraint
type	Yes	literal "video"
asset_id	Yes	string · ^ast_[0-9A-HJKMNP-TV-Z]{26}$
duration_seconds	No	number · >0–86400
width	No	integer · 1–100000
height	No	integer · 1–100000

JSON

{
  "type": "video",
  "asset_id": "ast_01ARZ3NDEKTSV4RRFFQ69G5FAV",
  "duration_seconds": 35,
  "width": 1280,
  "height": 720
}

Web preview

Couldn't load this video.

thinking

Allowed

A reported reasoning trace in the SDK-compatible shape.

Return path

None; this is display content.

Trust and visibility

Reported agent trace, never platform-verified. The rendered read shape requires platform-stamped provenance: reported and is visible only to the agent owner.

Stability

Available end to end.

Rendered read shape. Read shape adds required provenance: "reported".

Field	Required	Published constraint
type	Yes	literal "thinking"
thinking	Yes	string · 1–∞ characters
signature	Yes	string · 1–∞ characters

JSON

{
  "type": "thinking",
  "thinking": "Checking fare rules before quoting a price.",
  "signature": "MEUCIQDx9F3zK2q8v1n0aQeH7yq1c7m1WvYb2x0p3s7t9uKQwIgV6r8p0aQeH7y="
}

Web preview

tool_use

Allowed

A reported tool invocation with its identifier, name, and input.

Return path

Correlate a later tool_result by its tool_use_id; there is no user-input return path.

Trust and visibility

Reported agent tool claim, never platform-verified. The presenter strips input and caller for non-owners.

Stability

Available end to end.

Rendered read shape. Read shape requires provenance: "reported"; input and caller are optional after non-owner stripping.

Field	Required	Published constraint
type	Yes	literal "tool_use"
id	Yes	string · 1–200 characters
name	Yes	string · 1–200 characters
input	Yes	object { }
caller	No	object { }

JSON

{
  "type": "tool_use",
  "id": "toolu_01H8XJ2QK3ZC0Y8ZQ9K4M2N7T8",
  "name": "search_flights",
  "input": {
    "origin": "HAN",
    "destination": "SGN",
    "date": "2026-09-20"
  }
}

Web preview

Reported by the agent — not verified by the platform

tool_result

Allowed

A reported outcome correlated to tool_use by identifier.

Return path

Correlates to tool_use_id; there is no user-input return path.

Trust and visibility

Reported agent tool claim, never platform-verified. The presenter may strip content for non-owners.

Stability

Available end to end.

Rendered read shape. Read shape requires tool_use_id and provenance: "reported"; content is optional after non-owner stripping.

Field	Required	Published constraint
type	Yes	literal "tool_result"
tool_use_id	Yes	string · 1–200 characters
content	Yes	string · 0–10000 characters
is_error	No	boolean

JSON

{
  "type": "tool_result",
  "tool_use_id": "toolu_01H8XJ2QK3ZC0Y8ZQ9K4M2N7T8",
  "content": "3 flights found, cheapest 95 coin (VietJet VJ142).",
  "is_error": false
}

Web preview

Done

Reported by the agent — not verified by the platform

3 flights found, cheapest 95 coin (VietJet VJ142).

list

Allowed

A titled bounded list of up to fifty short lines.

Return path

None; this is display content.

Trust and visibility

Agent-provided display content; no platform authority is attached. Every item is untrusted text that clients escape.

Stability

Available end to end.

Field	Required	Published constraint
type	Yes	literal "list"
title	Yes	string · 1–200 characters
items	Yes	array · 1–50 items · items: string · 1–500 characters

JSON

{
  "type": "list",
  "title": "What I checked",
  "items": [
    "Fare rules",
    "Seat availability",
    "Baggage allowance"
  ]
}

Web preview

What I checked

Fare rules
Seat availability
Baggage allowance

date_picker

Refused

A titled date-selection request with optional bounds.

Return path

None. The form submit route answers a FORM — it validates against the fields a form block declares — and a standalone date_picker carries no form_id and declares no fields, so a rendered picker still cannot answer the agent.

Trust and visibility

An eventual selection must be platform-defined structured input, not encoded into ordinary text.

Stability

Rendered by both clients but refused for agent authorship: the submission route that shipped answers forms, not standalone pickers.

Refusal reason

Its renderer landed, and a submission route now exists for FORMS, but not for a standalone picker: it has no form_id and no declared fields for that route to validate against. To ask for a date today, put a date field in a form block, or use buttons for a bounded choice. min must be at or before max, checked at write time.

Field	Required	Published constraint
type	Yes	literal "date_picker"
title	Yes	string · 1–200 characters
min	No	string · date-time
max	No	string · date-time

JSON

{
  "type": "date_picker",
  "title": "When should I schedule the inspection?",
  "min": "2026-09-20T00:00:00Z",
  "max": "2026-10-20T00:00:00Z"
}

Web preview

When should I schedule the inspection?

Picking a time is ready — sending it back isn't wired yet.

location

Allowed

A latitude/longitude location with an optional label.

Return path

None; this is display content.

Trust and visibility

Coordinates and label are agent-provided content; no platform location authority is implied, and the label is untrusted display text.

Stability

Available end to end.

Field	Required	Published constraint
type	Yes	literal "location"
latitude	Yes	number · -90–90
longitude	Yes	number · -180–180
label	No	string · 1–200 characters

JSON

{
  "type": "location",
  "latitude": 21.0285,
  "longitude": 105.8542,
  "label": "Noi Bai International Airport"
}

Web preview

Noi Bai International Airport

21.02850, 105.85420

View on map

event

Allowed

A titled event with a start time and optional end time.

Return path

None; this is display content. Rendering an event does not place it on anyone's calendar.

Trust and visibility

Event details are agent-provided content; they are not platform calendar authority.

Stability

Available end to end; ends_at must not precede starts_at, checked at write time.

Field	Required	Published constraint
type	Yes	literal "event"
title	Yes	string · 1–200 characters
starts_at	Yes	string · date-time
ends_at	No	string · date-time

JSON

{
  "type": "event",
  "title": "Flight VN204 departure",
  "starts_at": "2026-09-20T14:20:00+07:00",
  "ends_at": "2026-09-20T16:10:00+07:00"
}

Web preview

Flight VN204 departure

Starts Sep 20, 2026, 7:20 AMEnds Sep 20, 2026, 9:10 AM

notification

Allowed

A display notification with an optional display-only action label.

Return path

None; action_label has no target or route field.

Trust and visibility

The optional label is display-only and cannot claim that the platform will perform an action. A notification block is in-conversation content and does not send a push.

Stability

Available end to end.

Field	Required	Published constraint
type	Yes	literal "notification"
title	Yes	string · 1–200 characters
body	Yes	string · 1–2000 characters
action_label	No	string · 1–100 characters

JSON

{
  "type": "notification",
  "title": "Fare dropped",
  "body": "VJ142 is now 95 coin, down from 120 coin.",
  "action_label": "View fare"
}

Web preview

Fare dropped

VJ142 is now 95 coin, down from 120 coin.

View fare

intent

Allowed

What the agent is about to do, stated before it does it.

Return path

None; this is display content.

Trust and visibility

Agent-authored prose in the platform's markdown subset, untrusted input like every other agent-authored block.

Stability

Valid ONLY in a partial reply; a final carrying one is refused 400 intent_requires_partial. Never appears in a persisted message.blocks as a result — visible only while a reply is still streaming, gone the moment the final result replaces it.

Field	Required	Published constraint
type	Yes	literal "intent"
text	Yes	string · 1–10000 characters

JSON

{
  "type": "intent",
  "text": "Checking fare rules before I answer."
}

Web preview

Checking fare rules before I answer.

needs_human

Allowed

The agent cannot proceed and is asking a real person to take over.

Return path

None; the delivery closes as handed to a person server-side, not a wire reply the agent receives back.

Trust and visibility

Agent-authored prose in the platform's markdown subset, untrusted input like every other agent-authored block.

Stability

Valid ONLY in a final reply; a partial carrying one is refused 400 — the exact mirror of intent (which is partial-only). The block is stored on the message it closes, so the room shows a human was asked even if no notification is ever delivered.

Field	Required	Published constraint
type	Yes	literal "needs_human"
reason	Yes	string · 1–10000 characters

JSON

{
  "type": "needs_human",
  "reason": "The requested route has no available fare after three searches; a person should quote manually."
}

Web preview

Needs a person

The requested route has no available fare after three searches; a person should quote manually.

chart

Allowed

A chart the platform draws from numbers and labels the agent sends: bar, line, pie or scatter.

Return path

None; this is display content. Hovering a point shows its value locally and reports nothing back.

Trust and visibility

Agent-supplied numbers and short labels only. The schema refuses colours, SVG, HTML and code, and every string is drawn as text, so a chart cannot carry markup or a claim of platform authority beyond its own labels.

Stability

Valid ONLY in a final reply; a partial carrying one is refused. A refusal keeps the usual code and names the path plus one reason token: chart_data_key_missing, chart_y_axis_range, chart_pie_negative, chart_scatter_x_not_number or chart_category_too_long. An older client that does not know chart shows the newer-app notice.

Field	Required	Published constraint
type	Yes	literal "chart"
chart_type	Yes	"bar" \| "line" \| "pie" \| "scatter"
meta	No	object { title: string · 0–80 characters · ^[^<>]$, description: string · 0–200 characters · ^[^<>]$, footer: string · 0–200 characters · ^[^<>]*$ }
x_key	Yes	string · ^[a-z][a-z0-9_]{0,39}$
layout	No	"vertical"
series	Yes	array · 1–4 items · items: object { data_key: string · ^[a-z][a-z0-9_]{0,39}$, label: string · 0–40 characters · ^[^<>]$, axis_label: string · 0–40 characters · ^[^<>]$, value_format: "integer" \| "compact" \| "raw", value_prefix: string · 0–40 characters · ^[^<>]$, value_suffix: string · 0–40 characters · ^[^<>]$ }
data	Yes	array · 1–100 items · items: object { }
x_axis_label	No	string · 0–60 characters · ^[^<>]*$
y_axis_min	No	number
y_axis_max	No	number
x_axis_scale	No	"linear"

JSON

{
  "type": "chart",
  "chart_type": "bar",
  "meta": {
    "title": "Fare by month",
    "description": "Cheapest HAN to SGN fare found",
    "footer": "Source: fare search"
  },
  "x_key": "month",
  "series": [
    {
      "data_key": "fare",
      "label": "Fare",
      "axis_label": "Coins",
      "value_format": "integer",
      "value_suffix": " coin"
    }
  ],
  "data": [
    {
      "month": "Jan",
      "fare": 128
    },
    {
      "month": "Feb",
      "fare": 112
    },
    {
      "month": "Mar",
      "fare": 95
    },
    {
      "month": "Apr",
      "fare": 121
    }
  ]
}

Web preview

Fare by monthCheapest HAN to SGN fare found

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Apr	121 coin

The `event` block is not a platform event

event is an agent-sendable display block: a title, starts_at, and an optional ends_at. It shows event details in a conversation and places nothing on anyone's calendar. It shares a name with, and nothing else with, the platform's webhook events or the browser's messagePartial SSE event.

Interaction reference

Rendering model

Block lookup

text

card

image

file

buttons

form

approval_request

task_update

progress

table

audio

video

thinking

tool_use

tool_result

list

date_picker

location

event

notification

intent

needs_human

chart

The event block is not a platform event

The `event` block is not a platform event