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[Server] Serve ClientGateway::elicit() under the modern lifecycle (#466)

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One handler asks the user something on any revision now. Where the client
can be asked mid-request it still is; where it cannot, the ask becomes the
input_required result that revision carries and the same call returns the
answer once the client re-sends it.

Costs one handler entry per ask, so side effects belong after the last
question. Answers from earlier rounds travel in the requestState, which is
why asking more than once needs Builder::setRequestState().

sample() and listRoots() still raise a LogicException there: that revision
removed them outright.
This commit is contained in:
Christopher Hertel 2026-08-20 01:25:59 +02:00 • committed by GitHub
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@ -30,7 +30,7 @@ npx @modelcontextprotocol/inspector php examples/server/discovery-calculator/ser
| [`env-variables`](https://github.com/modelcontextprotocol/php-sdk/tree/main/examples/server/env-variables) | Configuring a server through environment variables | [Server builder](run/server-builder.md) |
| [`client-communication`](https://github.com/modelcontextprotocol/php-sdk/tree/main/examples/server/client-communication) | Sampling, roots, progress and log messages from inside a handler | [Talking back to the client](handlers/client-communication.md) |
| [`client-logging`](https://github.com/modelcontextprotocol/php-sdk/tree/main/examples/server/client-logging) | Structured log notifications through the `ClientLogger` | [Logging](handlers/logging.md) |
| [`elicitation`](https://github.com/modelcontextprotocol/php-sdk/tree/main/examples/server/elicitation) | Asking the user for input mid-call with `InputRequiredResult` and typed elicitation schemas | [Asking for input](handlers/input-required.md) |
| [`elicitation`](https://github.com/modelcontextprotocol/php-sdk/tree/main/examples/server/elicitation) | Asking the user for input mid-call with `ClientGateway::elicit()` and typed elicitation schemas, on either protocol era | [Asking for input](handlers/input-required.md) |
| [`custom-method-handlers`](https://github.com/modelcontextprotocol/php-sdk/tree/main/examples/server/custom-method-handlers) | Registering handlers for custom JSON-RPC methods | [Custom message handlers](advanced/custom-handlers.md) |
| [`mcp-apps`](https://github.com/modelcontextprotocol/php-sdk/tree/main/examples/server/mcp-apps) | The MCP Apps extension: a tool that ships an interactive HTML view | [Protocol extensions](advanced/extensions.md) |
| [`stateless-lifecycle`](https://github.com/modelcontextprotocol/php-sdk/tree/main/examples/server/stateless-lifecycle) | Revision `2026-07-28`: cache policy, request state, notification bus | [Serving both eras](run/protocol-eras.md), [Caching](run/caching.md), [Subscriptions](run/subscriptions.md) |