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