Checked fact 8248 Oct 2026Agents and apps

Anthropic says modifying tool definitions (names, descriptions, parameters) invalidates the entire cache. Quote: "Modifying tool definitions (names, descriptions, parameters) invalidates the entire cache"

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The exact words it rests on

Tool definitions ✘ ✘ ✘ Modifying tool definitions (names, descriptions, parameters) invalidates the entire cache

What the source said when we opened it, on 8 Oct 2026.

The source

Prompt caching
Anthropic

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Checked by the notis newsroom on 8 Oct 2026, against the source above.

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How prompt caching bills a repeated prompt start 8 Oct 2026

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“Anthropic says modifying tool definitions (names, descriptions, parameters) invalidates the entire cache. Quote: "Modifying tool definitions (names, descriptions, parameters) invalidates the entire cache".” ai notis, checked 8 Oct 2026. Source: Prompt caching (Anthropic). https://ainotis.com/c/824

As a reference (APA style)

ai notis. (2026, October 8). Anthropic says modifying tool definitions (names, descriptions, parameters) invalidates the entire cache. Quote: "Modifying tool definitions (names, descriptions, parameters) invalidates the entire cache" [Checked claim 824]. ai notis. https://ainotis.com/c/824

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