Agent Identity has launched a new SDK that provides AI agents with persistent identities, including real email inboxes, phone numbers, and secure vaults. This infrastructure aims to solve the fragmented nature of agent communication by unifying channels under a single identity model. The project offers a typed SDK that allows developers to scaffold agents with a single command, npm install @agentidentity/sdk.

Unified Communication Channels

The core value proposition is the consolidation of disparate communication methods into one coherent thread. Agents can receive emails, SMS, and voice calls, with all interactions logged under the same identity. For example, a support agent can handle an email inquiry about order #4821, then seamlessly switch to an SMS conversation for address updates, maintaining context across channels. The platform supports A2A (Agent-to-Agent) protocols, enabling signed, verifiable messages between different agent identities, such as a Sales agent requesting leads from a Research agent.

Security and Access Control

Security is handled through a scoped vault system where secrets are encrypted at rest using AES-256 and never sent directly to the LLM prompt. Each agent identity has its own set of keys, and access is governed by a policy engine that checks every action before execution. The documentation highlights that actions like vault.read can be blocked by policy, with all decisions logged for audit trails. This approach ensures that sensitive credentials, such as STRIPE_SECRET_KEY or TWILIO_API_KEY, remain isolated from the agent's reasoning process.

Pricing and Availability

Agent Identity offers a tiered pricing model starting with a free plan for up to five agent identities, which includes email inboxes, public URLs, and agent-to-agent messaging. The Builder plan costs $19 per month for 15 identities and adds dedicated VoIP numbers and custom domains. Higher tiers, such as the Team plan at $149 per month, scale up to 120 identities with additional features like dedicated iMessage lines. Phone, SMS, and iMessage features are currently in development, with usage-based billing for these channels set to activate once they ship.

Key Takeaways

  • Agent Identity provides a unified SDK for managing agent inboxes, phone numbers, and secure vaults.
  • The platform supports A2A protocols for signed, verifiable communication between agent identities.
  • Secrets are encrypted at rest and scoped per agent, ensuring they never touch the LLM prompt.
  • Pricing starts at $0/month for 5 identities, with paid tiers offering dedicated VoIP and custom domains.
  • Phone, SMS, and iMessage features are announced but not yet live, with usage billing pending release.

The Bottom Line

Agent Identity tackles the critical lack of persistent, secure identity for autonomous agents, though its immediate utility is limited until the promised voice and SMS channels go live.