Use everything
AgentEnvelope has three practical surfaces. Start with the one that matches where your code runs, then add governance when you need operated records, attestation receipts, and audit evidence.
SDK
Use in your own app, worker, Lambda, verifier, or sovereign runtime.
Derive capabilities, sign actions, verify signatures, build delegates, and verify receipts without a network call.
MCP
Use when an agent tool host needs AgentEnvelope as a callable tool.
Expose sovereign verification plus governance and attestation actions to MCP clients such as Claude, OpenAI agents, LangChain, CrewAI, Cursor, or custom runtimes.
Governance + attestation
Use agentenvelope.io when you want operated records and auditability.
Publish public records, call API-keyed verify and mint, receive attestation receipts, keep ledgers, meter usage, and export audit evidence.
Build offline
Use the SDK directly. Hold your own root, derive capabilities, sign actions, and verify locally. No account or API key.
Use an agent host
Run the MCP server. The agent host calls AgentEnvelope tools instead of embedding SDK code directly.
Operate with governance
Use the portal and hosted API. API keys meter governance routes; signatures, public records, and attestation receipts prove authority.
Mix both
Use the SDK for local authority and governance for records, attestation receipts, ledgers, usage controls, and team continuity.
npm install agent-envelope-sdk@latestnpx -y agent-envelope-mcp@latest