Inside your handler
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A handler's arguments come from the client. Everything else it can read, and everything it can do while it runs, is here.
What it can read:
- The Context is the one extra parameter any handler can ask for: the live request, its headers, its session, and the progress and change-notification verbs.
- Dependencies are parameters the model never sees,
filled in by your own functions with
Resolve. - Lifespan covers state your server builds once at
startup, and how a handler reaches it through the
Context.
What it can do while it runs:
- Ask the user for more input with Elicitation, and Multi-round-trip requests, the 2026-07-28 pattern that carries it.
- Ask the client for an LLM completion or its workspace folders with Sampling and roots, deprecated but still served.
- Report Progress on something slow.
- Write logs (to standard error, for whoever operates the server) with Logging.
- Tell subscribed clients that something changed with Subscriptions.
If you haven't registered a handler yet, start with Tools. Every page here assumes you have one.