select_scope (client_auth/scope.rs)

! Scope handling helpers for MCP OAuth client. ! ! Implements the scope-selection strategy from ! [SEP-835](https://modelcontextprotocol.io/specification/2025-11-25/basic/authorization#scope-selection-strategy) ! and the scope-union behavior on re-authorization required by ! [SEP

// Source: https://github.com/rust-mcp-stack/rust-mcp-sdk | License: MIT | Copyright 2025 Rust MCP Stack (rust-mcp-sdk)
// Provided via justclaw.it.com; keep this notice with the code.
//! Scope handling helpers for MCP OAuth client.
//!
//! Implements the scope-selection strategy from
//! [SEP-835](https://modelcontextprotocol.io/specification/2025-11-25/basic/authorization#scope-selection-strategy)
//! and the scope-union behavior on re-authorization required by
//! [SEP-2350](https://modelcontextprotocol.io/specification/2025-11-25/basic/authorization#scope-challenge-handling).

use std::collections::BTreeSet;

/// Apply SEP-835 scope-selection strategy: pick the first non-empty value
/// from the prioritized list:
///
/// 1. `scope` parameter from the `WWW-Authenticate` challenge
/// 2

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