Flow diagrams

Visualize Fentaris request routing and lifecycle.

Use these diagrams to understand how requests move through Fentaris. Each diagram maps to an operational moment: initialization, discovery, and tool calls. This is helpful when you want to explain the system to a new team member or debug a request path.

If you are building a custom transport or middleware chain, keep this page open as a reference.

Initialization flow

During initialization the proxy creates a session and attaches the MCP SDK server transport. This is the point where name and version are announced to the client.

Tool discovery flow

Tool discovery is where onListTools filters run. Use this to hide internal tools or to expose only the subset allowed for the current user.

Tool call flow with middleware

Hooks run first and can short-circuit a call. Middleware runs next and can enforce policy, inject guidance, and augment logs. The server is only invoked when middleware allows it.

Where to go next

• For policy and access control, see Middleware.
• For targeted audits, see Hooks.
• For transport details, see Transports.