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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Code CLI 23 Oct 2026
One change · claude-code

How Claude Code uses prompt caching changedprompt-caching

Nearest release: v2.1.309, published 5 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Upstream edited this page at 23 Oct 2026 02:28 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 23 Oct 2026 02:37 UTC.

Upstream edited
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From line 114 where the diff opens
First seen 14 Aug 2026 this site's first read of the page
Recorded edits54to this page, all time

The whole hunk

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114114| Mid-session change | Cache | Tool definitions in the next request |
115115| - | - | - |
116116| A server connects, or a [dynamic tool update](/docs/en/mcp.md#dynamic-tool-updates) adds tools | Invalidated | The new definitions are added |
117| A server drops out with no action on your part, such as a stdio server's process exiting | Kept | The server's definitions stay unchanged. A call to one of its tools returns an error instead of running |
117| A server drops out with no action on your part, such as a stdio server's process exiting | Kept | The server's definitions stay unchanged. A call to one of its tools returns an error instead of running, unless Claude Code [starts the server again](/docs/en/mcp.md#stdio-servers-that-exit-or-fail-to-start) for that call |
118118| A remote server [reconnects automatically](/docs/en/mcp.md#automatic-reconnection) after its connection drops | Kept, unless a request sent while the server reconnects adds the `WaitForMcpServers` tool, which invalidates the cache once | The server's definitions stay unchanged. A request sent while the server reconnects can add `WaitForMcpServers` when the conversation hasn't listed it yet, and the tool then stays listed for the rest of the conversation |
119119| You remove a tool on purpose, such as with a [deny rule](#denying-an-entire-tool) or by disabling its server in `/mcp` | Invalidated | The definition is removed |
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