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, legitimacy state, verification reports, mint receipts, and audit evidence.
SDK
Use in your own app, worker, Lambda, verifier, or sovereign runtime.
Derive capabilities, sign actions, verify signatures, build delegates, sign mint requests, and verify receipts without a network call.
MCP
Use when an agent tool host needs AgentEnvelope as a callable tool.
Expose sovereign verification plus governed report, receipt, delegate, legitimacy, and mint actions to MCP clients such as Claude, OpenAI agents, LangChain, CrewAI, Cursor, or custom runtimes.
Governance + receipts
Use agentenvelope.io when you want operated records and auditability.
Publish public records, enforce legitimacy, call API-keyed verify and mint, receive verification reports and mint 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, legitimacy state, reports, and receipts prove what was checked.
Mix both
Use the SDK for local authority and governance for records, legitimacy, reports, receipts, ledgers, and usage controls.
npm install agent-envelope-sdk@latestnpx -y agent-envelope-mcp@latest