For AI agents: the complete documentation index is available at https://aioproxy.dev/llms.txt, the full documentation bundle is available at https://aioproxy.dev/llms-full.txt, and this page is available as Markdown at https://aioproxy.dev/api/count-message-tokens.md.
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      • Count message tokens POST /v1/messages/count_tokens

      Counts tokens for an Anthropic Messages request using the configured token-counting route.

      Parameters / Responses

      Parameters: conversation_id, max_tokens, messages, metadata, model, output_config, service_tier, session_id, speed, stream, system, temperature, thinking, tools

      Responses: 2XX application/json

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