Summary: ** 0.16 ** rmcp-v0.16.0 Latest Added add support for custom HTTP headers in StreamableHttpClient (#655) (auth) add token_endpoint_auth_method to OAuthClientConfig (#648) Fixed remove unnecessary doc-cfg (#661) duplicate meta serialization (#662) sort list_all() output in ToolRouter and PromptRouter for deterministic ordering (#665) align task response types with MCP spec (#658) Other upgrade reqwest to 0.13.2 (#669) include LICENSE in final crate tarball (#657) (deps) update rand requirement from 0.9 to 0.10 (#650) remove unused axum dependency from server-side-http feature (#642) 11-25-2025 compliant Auth (#651) add rudof-mcp to MCP servers list (#645) ** 0.15 ** Added (elicitation) add support URL elicitation. SEP-1036 (#605) enforce SEP-1577 MUST requirements for sampling with tools (#646) add native-tls as an optional TLS backend (#631) (capabilities) add extensions field for SEP-1724 (#643) Fixed (tasks) avoid dropping completed task results during collection (#639) (auth) oauth metadata discovery (#641) compilation with --no-default-features (#593) (tasks) expose execution.taskSupport on tools (#635) (tasks) correct enum variant ordering for deserialization (#634) Other Add optional description field to Implementation struct (#649) Implement SEP-1577: Sampling With Tools (#628) Reviewed By: dtolnay Differential Revision: D93150677 fbshipit-source-id: 4cdf91fe34c194864c75f140635150564a9934c7