[Platform][Anthropic] Support cache_control on system prompt block#2117
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4lxndr wants to merge 1 commit into
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[Platform][Anthropic] Support cache_control on system prompt block#21174lxndr wants to merge 1 commit into
4lxndr wants to merge 1 commit into
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4lxndr
commented
May 26, 2026
4lxndr
commented
Contributor
| Q | A |
|---|---|
| Bug fix? | no |
| New feature? | yes |
| Docs? | yes |
| Issues | Fix #2111 |
| License | MIT |
- MessageBagNormalizer now emits the system prompt as a typed content-block array ([{type: text, text: ...}]) instead of a bare string, so a cache marker can be attached. Anthropic accepts both shapes, so callers see no difference.
- ModelClient attaches a cache_control marker to the system block when cacheRetention is short/long (skipped for none), mirroring the existing tool-definition caching.
carsonbot
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chr-hertel
reviewed
Jun 3, 2026
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+140
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| $cacheControl = 'long' === $this->cacheRetention | ||
| ? ['type' => 'ephemeral', 'ttl' => '1h'] | ||
| : ['type' => 'ephemeral']; |
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how about extracting this into getCacheControl(): array for synergy with injectCacheControl usage?
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