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Inkbox gives AI agents a persistent identity with a real inbox, phone number, and a public tunnel URL. Agents share an organization-wide contact book. You control each agent’s access to notes and vault secrets.
Using an AI coding assistant? Install the Inkbox skill to give it instant knowledge of the SDK. Works with Claude Code, Cursor, and any Skills compatible agent.

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What is Inkbox?

Inkbox is an identity and communication layer for AI agents. Each agent has its own communication channels and can work with shared organization resources. Each identity owns exactly one mailbox and one tunnel; both are provisioned atomically when you create the identity, and torn down when you delete it. A phone number is optional and can be attached separately. Handles are globally unique. Per agent — its own communication channels:
  • An identity: a globally unique handle and the persistent record your agent acts under
  • A real email address: send and receive email, manage threads, search inboxes
  • A public tunnel URL: stable my-agent.inkboxwire.com that routes inbound HTTP, WebSocket, and raw-TCP traffic to your agent over a single persistent connection. No public IP or firewall hole needed
  • A real phone number (optional): make and receive calls with real-time audio streaming, plus SMS/MMS
  • Filtering: per-identity whitelist and blacklist rules governing who can reach the agent over email, calls, and texts
Shared organization resources:
  • Contacts: an address book that every agent in the organization can view and edit
  • Notes: free-form context with access granted to specific agents
  • Vault: encrypted credentials and TOTP secrets with per-agent access rules. Inkbox never sees the plaintext
Contact access grants do not restrict visibility. Use notes or the vault when information needs access controls.

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How it works

Each agent identity owns its mailbox, tunnel, and optional phone number, plus its conversation history. Contacts are shared across the organization. Notes and vault secrets have separate access rules.
Conversations persist across channels, so your agent can follow up over email after a call (or vice versa) with full context. Channels are first-class resources:
  • Each mailbox has its own address (agent@inkboxmail.com)
  • Each tunnel is reachable at a stable subdomain (e.g. my-agent.inkboxwire.com)
  • Each phone number is a real PSTN number your agent can call from or receive calls on

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Who is it for?

Inkbox is designed for AI agents (and the developers building them) that need to communicate with real people: customer support assistants, outbound sales agents, automated phone operators, and any agent that needs a durable identity to follow up over time.

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Next steps

  • Follow the Quickstart to send your first email and place your first call in minutes.
  • Set up Agent signup to let agents self-provision without a pre-existing account.
  • Install the Inkbox skill to teach your coding assistant the SDK.
  • Browse the API reference to see every endpoint in detail.