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Client call_tool: input_responses/request_state retry params; InputRequiredResult via allow_input_required (#2968)

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Max 2026-06-25 17:37:00 +02:00 • committed by GitHub
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docs/migration.md
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@ -364,6 +364,10 @@ For an in-process `Client(server)` (where `server` is a `Server` or `MCPServer`
`Client.send_ping()` is deprecated (ping is removed in 2026-07-28); pin `mode='legacy'` if you need it.
### `call_tool` can return `InputRequiredResult` (opt-in)
For protocol 2026-07-28, a `tools/call` request may return an `InputRequiredResult` asking the client to supply additional input and retry. By default `call_tool` (on `ClientSession`, `Client`, and `ClientSessionGroup`) still returns `CallToolResult` and raises `RuntimeError` if the server requests input. Pass `allow_input_required=True` to receive the `InputRequiredResult` instead, then retry with `input_responses=` / `request_state=`.
### `McpError` renamed to `MCPError`
The `McpError` exception class has been renamed to `MCPError` for consistent naming with the MCP acronym style used throughout the SDK.