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Structured Reflection (Think Tool)
A dedicated no-op "think" tool (Anthropic) declared in the agent tool schema that the model calls mid-trajectory to append structured reasoning between a tool result and the next action. The call has no external effect and returns nothing useful: it simply gives the model a checkpoint to re-read policy, verify constraints, and plan before acting inside a long tool-call chain. Anthropic reports a 54% relative improvement on the tau-bench airline pass^1 metric (0.570 versus a 0.370 baseline) when the tool is paired with a prompt that shows how to use it. Distinct from `metacognitive-monitoring`: that entry is the general capability of monitoring one's own reasoning, whereas the think tool is a concrete tool-schema mechanism for it, separate from extended or inference-time thinking that happens before the first response.
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Structured Reflection (Think Tool)
A dedicated no-op "think" tool (Anthropic) declared in the agent tool schema that the model calls mid-trajectory to append structured reasoning between a tool result and the next action. The call has no external effect and returns nothing useful: it simply gives the model a checkpoint to re-read policy, verify constraints, and plan before acting inside a long tool-call chain. Anthropic reports a 54% relative improvement on the tau-bench airline pass^1 metric (0.570 versus a 0.370 baseline) when the tool is paired with a prompt that shows how to use it. Distinct from `metacognitive-monitoring`: that entry is the general capability of monitoring one's own reasoning, whereas the think tool is a concrete tool-schema mechanism for it, separate from extended or inference-time thinking that happens before the first response.
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