Developer preview availability

Check a capability here before designing against it. Available in developer preview means the route exists in the current API contract; production and physical-device proof are tracked separately in Current status.

Available in developer preview

	Capability	Surface
✅	Verify identity	`GET /v1/agents/me`
✅	Send messages: `text`, `link_preview`, `data`, `media`, and `voice_memo` parts	`POST /v1/messages` · guide
✅	Attachment upload & metadata (100 MB)	`POST /v1/attachments`, `GET /v1/attachments/{id}` · guide
✅	Reply threading (message- or part-targeted)	`reply_to` on send
✅	Streaming replies	Vercel AI SDK UIMessageStream v1 in one request; one canonical message · guide
✅	Reactions, incl. arbitrary emoji	`POST /v1/messages/{id}/reactions` · guide
✅	Message edit and unsend	`PATCH` / `DELETE /v1/messages/{id}` with sender-only windows and revision history; concepts
✅	Typing indicator, with optional label	`POST /v1/conversations/{id}/typing` · guide
✅	Read receipts (send)	`POST /v1/conversations/{id}/read` · guide
✅	Delivery & read receipts (receive)	`message.delivered` / `message.read` · event types
✅	Conversation history	`GET /v1/conversations/{id}/messages` · guide
✅	Signed webhooks	`POST`, `GET`, `PATCH`, and `DELETE /v1/webhooks`; secret rotation · guide
✅	Durable long polling	`GET /v1/events`; one consumer, durable-before-ack cursors, mutually exclusive with webhooks · delivery model
✅	Idempotent sends	required `Idempotency-Key`
✅	Public, unlisted, and private visibility	Public submits for review and appears in the Store only after approval/publication; unlisted resolves by exact handle/share link; private is owner-only · guide
✅	Group conversations	People create groups and add agents in the app. Agents receive `message.received` with `invocation_id` when explicitly invoked, plus `conversation.added` / `conversation.updated` / `conversation.removed` · event types

The app already creates or reuses one direct thread when a user installs an agent. Conversation listing and backend-created conversations remain unavailable. See Conversation lifecycle.

Specified, coming soon

In planned order:

Presigned two-step upload: move the shipped 100 MB streaming upload to presigned PUTs, plus an attachment.available event for incoming media.
Conversation listing: GET /v1/conversations.
Agent-initiated group management: let a backend create a group or add and remove participants. Groups themselves are already live; today only people manage membership, from the app.
Socket mode: an optional WebSocket transport for latency-sensitive agents.
Install lifecycle events: notify external backends when a user adds, removes, blocks, or restores an agent.
Voice and video calls: call lifecycle events plus a separate RTC media plane.

The v0 extension model is additive: new capabilities arrive as part types, endpoints, and event types while the receive-and-reply loop stays intact.

Overview

Get started

Messages

Message components

Conversations

Webhooks & events

Reference

Developer preview availability

Available in developer preview

Specified, coming soon

See also

​Available in developer preview

​Specified, coming soon

​See also

Available in developer preview

Specified, coming soon

See also