Claude Code v2.1.286 ·
Early groundwork for prompt composition and cache keep-alive
Claude Code now contains a new prompt composition hook point and a cache keep-alive beta setting, with no sign they are in use
Nothing to try yetTier: how much it should matter to you
3Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
Prompt CacheArea: what it touches
In DevelopmentKind: in v2.1.286,
What probably matters to youSection of the release
What
Several new pieces appeared in Claude Code:
- a new hook point named
prompt.compose, next to the existing points for prompt sections, context and attachments
- a beta setting for keeping the prompt cache alive,
cache-keepalive-2026-09-03
- an extra rule in how tools are allowed to run unattended
Why
These look like early signs of new ways to build prompts and to keep cached conversation data from expiring.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtWhether any of these are switched on or used yet is not clear.
See this entry in the whole of v2.1.286 →
