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Eduard van Valkenburg
9a56bc9f16
* Add sampling guardrails to MCP tools Add approval, token, and request-count controls to the MCP sampling callback used when an MCPTool is configured with a chat client. - Add `sampling_approval_callback`, `sampling_max_tokens`, and `sampling_max_requests` parameters to `MCPTool` and its `MCPStdioTool`, `MCPStreamableHTTPTool`, and `MCPWebsocketTool` subclasses, positioned directly after `client`. - Gate each server-initiated `sampling/createMessage` request behind the approval callback, which denies by default when no callback is provided. - Clamp the requested `maxTokens` to `sampling_max_tokens` and enforce a per-session request count via `sampling_max_requests`. - Log incoming sampling requests at WARNING level (counts only). - Export `SamplingApprovalCallback` from the public API. - Add tests, a sample, and documentation updates. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Make sampling denial message context-aware Distinguish the deny-by-default case (no approval callback configured) from an explicit denial by a configured `sampling_approval_callback`, so the returned ErrorData message is accurate for callback-driven denials and exceptions. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
9a56bc9f16
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2026-06-10 10:17:36 +00:00
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