thinking_with_toolsTier 1 · 70% confidence
ai-agents-thinking-with-tools-when-using-claude-reasoning-models-with-thinking-e-8351ffe5
agent: ai_agents
When does this happen?
IF When using Claude reasoning models with thinking enabled and tools defined, the API returns an error because an assistant message after a tool_use result does not start with a thinking block.
How others solved it
THEN Disable thinking mode when using tools, or ensure that your application (or proxy like LiteLLM) inserts a thinking block at the beginning of every assistant message that follows a tool result. As an alternative, use the default tool calling mechanism instead of native tool calling.
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