Inkbox

https://inkbox.ai

API-first communication infrastructure for AI agents — email (with custom sending domains), phone, identities, encrypted vault (login credentials, API keys, key pairs, SSH keys, OTP, etc.), and tunnels (expose a local server at a public URL via outbound HTTP/2).

Package	Language	Install
inkbox	Python ≥ 3.11	pip install inkbox
@inkbox/sdk	TypeScript / Node ≥ 22	npm install @inkbox/sdk
@inkbox/cli	CLI / Node ≥ 22	npm install -g @inkbox/cli

---

Quick Start

Get an API key from the Inkbox Console, then:

Python

from inkbox import Inkbox

with Inkbox(api_key="ApiKey_...") as inkbox:
    # Create an agent identity with a linked mailbox
    identity = inkbox.create_identity("my-agent", display_name="My Agent")
    identity.provision_phone_number()  # provisions a local number

    # Send an email
    identity.send_email(
        to=["user@example.com"],
        subject="Hello",
        body_text="Hi from my agent!",
    )

    # List recent emails
    for msg in identity.iter_emails():
        print(msg.subject, msg.from_address)

    # Place a phone call
    call = identity.place_call(to_number="+15551234567")

    # Send a text message (SMS/MMS); pass a list for group MMS.
    identity.send_text(to="+15551234567", text="Hi from my agent!")

    # Read text messages
    for t in identity.list_texts():
        print(t.remote_phone_number, t.text)

    # Reply over iMessage (identity must be iMessage-enabled and the
    # recipient connected to it via the shared triage line first)
    identity.send_imessage(to="+15551234567", text="Hi over iMessage!")

TypeScript

import { Inkbox } from "@inkbox/sdk";

const inkbox = new Inkbox({ apiKey: "ApiKey_..." });

// Create an agent identity with a linked mailbox
const identity = await inkbox.createIdentity("my-agent", { displayName: "My Agent" });
const phone = await identity.provisionPhoneNumber(); // provisions a local number

// Send an email
await identity.sendEmail({
  to: ["user@example.com"],
  subject: "Hello",
  bodyText: "Hi from my agent!",
});

// List recent emails
for await (const msg of identity.iterEmails()) {
  console.log(msg.subject, msg.fromAddress);
}

// Place a phone call
const call = await identity.placeCall({ toNumber: "+15551234567" });

// Send a text message (SMS/MMS); pass an array for group MMS.
await identity.sendText({ to: "+15551234567", text: "Hi from my agent!" });

// Read text messages
const texts = await identity.listTexts();
for (const t of texts) {
  console.log(t.remotePhoneNumber, t.text);
}

// Reply over iMessage (identity must be iMessage-enabled and the
// recipient connected to it via the shared triage line first)
await identity.sendIMessage({ to: "+15551234567", text: "Hi over iMessage!" });

CLI

# Create an agent identity (mailbox is created automatically)
inkbox identity create my-agent

# Send an email
inkbox email send -i my-agent \
  --to user@example.com \
  --subject "Hello" \
  --body-text "Hi from my agent!"

# List recent emails
inkbox email list -i my-agent --limit 10

# Place a phone call
inkbox phone call -i my-agent --to +15551234567

# Send a text message (SMS/MMS; comma-separate --to for groups)
inkbox text send -i my-agent --to +15551234567 --text "Hi from my agent!"

# Reply over iMessage (identity must be iMessage-enabled and the
# recipient connected to it via the shared triage line first)
inkbox imessage send -i my-agent --to +15551234567 --text "Hi over iMessage!"

# Read text messages
inkbox text list -i my-agent

# Initialize vault (first time only — requires INKBOX_VAULT_KEY)
inkbox vault init --vault-key "my-vault-key"

# Manage vault secrets
inkbox vault create --name "CRM Login" --type login --username bot@crm.com --password s3cret
inkbox vault secrets
inkbox vault get <secret-id>

Tunnels (Python)

# Bring a local server online at https://my-app.inkboxwire.com.
# Outbound HTTP/2 only — no inbound port to open. POSIX only.
listener = inkbox.tunnels.connect(name="my-app", forward_to="http://127.0.0.1:8080")
print(listener.public_url)
listener.wait()

Tunnels (TypeScript)

import { connect } from "@inkbox/sdk/tunnels/connect";

const listener = await connect(inkbox, {
  name: "my-app",
  forwardTo: "http://127.0.0.1:8080",
});
console.log(listener.publicUrl);
await listener.wait();

Both SDKs also accept an in-process callable (Fetch handler in TS, ASGI app in Python) instead of a forward_to URL, and a tls_mode: "passthrough" option for end-to-end TLS termination in your process. See skills/inkbox-tunnels/ for the full reference.

Redeploys are graceful. When the tunnel service redeploys, a long-running listener reconnects make-before-break: it stands up a fresh connection before closing the draining one, so short HTTP requests see no gap. In-progress WebSocket and passthrough-TCP sessions cannot migrate across a redeploy — they end with a typed server_draining close and the third-party peer reconnects onto the new task. Write handlers to reconnect idempotently.

Outbound SMS — current limits

• Outbound SMS works only from local numbers (not toll-free).
• 100 recipient sends per phone number per rolling 24h. A 3-recipient group message counts as 3 recipient sends. A single accepted send may push usage past the cap; the next capped send fails with 429 sender_rate_limited.
• A new local number waits ~10-15 minutes for the 10DLC campaign to propagate at the carrier; until then phone_number.sms_status (Python) / phoneNumber.smsStatus (TS) is "pending" and sends fail with 409 sender_sms_pending.
• Recipients must text START to any number in your organization to opt in. Unknown recipients fail with 403 recipient_not_opted_in; opt-outs (STOP) return 403 recipient_opted_out.
• Beta: Group MMS and conversation sends are beta. Some carriers may reject group chats or MMS from 10DLC numbers even when the sender is ready and recipients have opted in.

Customer-managed 10DLC brands and campaigns lift the default per-number cap to the carrier-assigned tier. Toll-free SMS sending is still coming soon.

---

Agent Signup

Agents can self-register without a pre-existing API key. The flow provisions a mailbox, identity, and API key in one call:

Python

from inkbox import Inkbox

# 1. Sign up (no API key needed)
result = Inkbox.signup(
    human_email="john@example.com",
    note_to_human="Hey John, this is your agent signing up!",
    display_name="My Agent",          # optional
    agent_handle="my-agent",          # optional
    email_local_part="my.agent",      # optional
)
api_key = result.api_key  # save this — shown only once

# 2. Verify (after human shares the 6-digit code)
Inkbox.verify_signup(api_key, verification_code="483921")

# 3. Use the API key
with Inkbox(api_key=api_key) as inkbox:
    identity = inkbox.get_identity(result.agent_handle)
    identity.send_email(to=["john@example.com"], subject="Hello!", body_text="I'm set up.")

TypeScript

import { Inkbox } from "@inkbox/sdk";

// 1. Sign up (no API key needed)
const result = await Inkbox.signup({
  humanEmail: "john@example.com",
  noteToHuman: "Hey John, this is your agent signing up!",
  displayName: "My Agent",      // optional
  agentHandle: "my-agent",      // optional
  emailLocalPart: "my.agent",   // optional
});
const apiKey = result.apiKey; // save this — shown only once

// 2. Verify (after human shares the 6-digit code)
await Inkbox.verifySignup(apiKey, { verificationCode: "483921" });

// 3. Use the API key
const inkbox = new Inkbox({ apiKey });
const identity = await inkbox.getIdentity(result.agentHandle);
await identity.sendEmail({ to: ["john@example.com"], subject: "Hello!", bodyText: "I'm set up." });

CLI

# 1. Sign up (no --api-key needed)
inkbox signup create --human-email john@example.com \
  --note-to-human "Hey John, this is your agent signing up!" \
  --display-name "My Agent" \
  --agent-handle my-agent \
  --email-local-part my.agent

# 2. Verify (after human shares the 6-digit code)
inkbox signup verify --code 483921

# 3. Check status
inkbox signup status

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What's in this repo

Directory	Description
sdk/python/	Python SDK (inkbox)
sdk/typescript/	TypeScript SDK (@inkbox/sdk)
cli/	CLI (@inkbox/cli)
skills/inkbox-python/	Python agent skill for Claude Code and other coding agents
skills/inkbox-ts/	TypeScript agent skill for Claude Code and other coding agents
skills/inkbox-tunnels/	Tunnels skill — bring a local server online at a public Inkbox URL
examples/use-inkbox-browser-use/	Inkbox + Browser Use — give your agent an email, phone, and vault
examples/use-inkbox-kernel/	Inkbox + Kernel — give your agent an email and browser
examples/use-inkbox-cli/	Shell script examples for CLI automation and CI pipelines
examples/use-inkbox-vault/	Vault TOTP example — create credentials with one-time codes
examples/use-inkbox-signup/	Agent self-signup — register without an API key, verify, send welcome email

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Agent Skills

Load the Inkbox skills into your coding agent so it automatically knows how to use the SDK.

Claude Code (plugin)

/plugin marketplace add inkbox-ai/inkbox   # <github-owner>/<repo>
/plugin install inkbox@inkbox              # <plugin-name>@<marketplace-name>
/reload-plugins

Codex (plugin)

codex plugin marketplace add inkbox-ai/inkbox

Then install inkbox from the Codex plugin UI. Codex has no codex plugin install subcommand yet, and the official plugin directory is not open for submissions — see the Codex plugin docs.

Any Agent (individual skills)

npx skills add inkbox-ai/inkbox/skills

See skills/README.md for details.

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Documentation

• Inkbox Docs
• API Reference
• Console

Releasing

Maintainers: see RELEASING.md for the lockstep version-bump and per-registry publish steps (PyPI, npm, crates.io).

License

MIT