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API Reference
Reference
SDKs

SDKs

SDKs for building with Keycard.

Pick a Keycard SDK based on what you build. Most teams start with the MCP package to add OAuth to MCP servers. Other packages cover edge runtimes, custom OAuth flows, and agent-to-agent delegation.

Build MCP servers

Section titled “Build MCP servers”
BUILD MCP SERVERS

Add OAuth to MCP servers. The most common Keycard use case.

MCPAdd OAuth to MCP servers. The most common starting point. Python, TypeScript, and Go.
Cloudflare WorkersDeploy MCP servers or APIs on Cloudflare Workers. Mirrors the MCP package with isolate-safe caching for Workers. TypeScript.

Custom auth flows

Section titled “Custom auth flows”
CUSTOM AUTH FLOWS

Build custom OAuth flows and agent-to-agent delegation.

OAuth PrimitivesBuild custom OAuth flows outside MCP. Discovery, token exchange, JWT, and PKCE. Python, TypeScript, and Go.
Agent-to-AgentBuild agent-to-agent delegation chains with the A2A protocol. Python and TypeScript.
API Reference