Token counting on the bedrock-mantle endpoint
Documented how to count input tokens through the Anthropic <code class="code">count_tokens</code> path on the <code class="code">bedrock-mantle</code> endpoint, including for Claude models that are not supported by <a href="https://docs.aws.amazon.com/bedrock/latest/APIReference/API_runtime_CountTokens.html">CountTokens</a> on <code class="code">bedrock-runtime</code>.