Allow us to enable the new token-efficient-tools header please

Good news for @AnthropicAI devs: We shipped a more token-efficient tool use implementation for 3.7 Sonnet that uses on average 14% less tokens under-the-hood and shows marked improvement in tool use performance. Use this beta header: "token-efficient-tools-2025-02-19"

-- @alexalbert__ on X.com

However looking under the hood I only see token-efficient-tools-2024-12-11 mentioned.

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If I could save 14% on my tokens I'd likely just use Claude Code even more :grin:

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