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Restore the version badge and point sampling users at 3.x

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Jeremiah Lowin 2026-07-26 21:10:41 -04:00
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8
docs/servers/sampling.mdx
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@ -5,8 +5,14 @@ description: Generate text from a FastMCP server — by calling an LLM directly,
icon: robot
---
import { VersionBadge } from "/snippets/version-badge.mdx"
<VersionBadge version="2.0.0" />
<Warning>
**`ctx.sample()` and `ctx.sample_step()` were removed in FastMCP 4.** The modern MCP protocol gives a server no channel to push a request to its client, so there is nothing left for those methods to do. Generate by [calling an LLM directly](#calling-an-llm-directly), or [ask the caller's model](#asking-the-callers-model) when borrowing their model is the point.
**`ctx.sample()` and `ctx.sample_step()` were removed in FastMCP 4.** The modern MCP protocol gives a server no channel to push a request to its client, so there is nothing left for those methods to do.
To build a server that uses sampling, stay on [FastMCP 3.x](/v3/servers/sampling). On FastMCP 4, generate by [calling an LLM directly](#calling-an-llm-directly), or [ask the caller's model](#asking-the-callers-model) when borrowing their model is the point.
</Warning>
A tool that needs text generated calls a model to get it, and in FastMCP 4 that call is ordinary Python: your server holds an API key, creates a provider client, and awaits a completion inside the tool. No protocol is involved, so the tool behaves the same for every client — including the many that never implemented sampling at all.