SDK and CLI coverage

API capability	TypeScript SDK	CLI
Autonomous registration	`agent.register`	`agent register`
Human-email signup / OTP	`agent.signUp`, `agent.verify`	`agent sign-up`, `agent verify`
Inbox create/read/update/delete	`inboxes`	`inboxes`
Thread list/search/read	`threads`	`threads list --q`, `threads get`
Thread labels/delete	`threads.update`, `threads.remove`	API/SDK only
Email send/reply/read	`emails`	`emails send`, `reply`, `list`
Email forward/reply-all/raw/labels/delete	`emails`	API/SDK only
Attachments upload with send	`attachments.fromBytes`, `emails.send`	`emails send --attachment LOCAL`
Attachments download	`attachments.download` (returns Response)	`attachments download --output LOCAL`
Draft create/list/send	`drafts`	`drafts create`, `list`, `send`
Draft update/delete/schedule	`drafts.update`, `drafts.remove`	API/SDK only
Domain CRUD/verification	`domains`	list/create/verify/delete
Webhooks CRUD	`webhooks`	list/create/delete
Webhook deliveries/resend	`webhooks.deliveries`, `webhooks.resend`	`webhooks deliveries`, `resend`
Webhook verification	`verifySignature(secret, rawBody, headers)`	Receiver code required
Phone inventory/purchase/release/activity	`numbers`	`numbers`
SMS	`sms`	send/conversations
Voice create/read/control	`calls`, `calls.action`	`calls create`, `list`, `get`, `action`
Container create/list/stop/resume	`containers`	`containers`
Container runs/files/ports/shell	`containers`	run/runs/upload/download/publish/ports/shell
Proxy provision/details/top-up	`proxies`	`proxies`
Projects and keys	`projects`, `apiKeys`	`projects`, `keys`
Metrics and allow/block lists	`metrics`, `lists`	API/SDK only
Project/inbox-scoped endpoint twins	Selected SDK methods	Use direct API for scope twins
Capabilities / Connections	`capabilities.get`, `connections`	`capabilities`, `connections`
Browser sessions	`browsers.list`, `create`, `connect`, `end`	`browsers list`, `create`, `connect`, `end`
Subscription billing	`billing.status`, `checkout`, `portal`	`billing status`, `checkout`, `portal`

This matrix describes checked-in clients, not a promise of full API parity. Collection responses expose next_page_token where the API supplies it; pass page_token on SDK lists that accept queries. New CLI container runs/lists and webhook deliveries accept --page-token and --limit.

Attachments and thread shape

Thread detail uses messages, matching the wire serializer; emails is not a thread field. Attachments are metadata on messages, threads and drafts. Upload bytes as inline base64 or a URL in a send/create-draft request; the API has no standalone attachment upload route. Download preserves the binary response:

const attachment = lupin.attachments.fromBytes("notes.txt", new TextEncoder().encode("hello"), "text/plain");
await lupin.emails.send(inboxId, { to: ["you@example.com"], text: "Notes", attachments: [attachment] });
const bytes = await (await lupin.attachments.download(inboxId, "threads", threadId, attachmentId)).arrayBuffer();

Container stop is the exposed lifecycle control; container deletion and public port revocation have no SDK method because the current backend exposes neither. Provider configuration is required for paid resources; see Phone and Containers. Provider acceptance, queued mail and recipient delivery are distinct states. Inspect returned resource status before announcing success. Connections use hosted provider authorization, server-verified account status, retained old-account cleanup on reconnect, and revoke-before-delete on disconnect. See Connections and Billing for provider setup and recovery. Browser sessions use a native Cloudflare Browser Run BROWSER binding; an unconfigured workspace keeps creation disabled. Session state lasts until the session ends, with a 10-minute inactivity timeout and five-minute access links. Cross-session profiles and custom proxy routing are not exposed. See Browsers.

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Email

Realtime

Phone and compute

Network

Platform

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Roadmap

Client capability matrix

SDK and CLI coverage

Attachments and thread shape

​SDK and CLI coverage

​Attachments and thread shape

SDK and CLI coverage

Attachments and thread shape