feat(anthropic): add cache_control field to ToolDefinition#1812
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jimmiebfulton wants to merge 1 commit into
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feat(anthropic): add cache_control field to ToolDefinition#1812jimmiebfulton wants to merge 1 commit into
jimmiebfulton wants to merge 1 commit into
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Anthropic's prompt-caching API supports up to 4 cache breakpoints per request. One of the three cacheable layers is the tools array: setting cache_control on the last ToolDefinition tells Anthropic to cache all tools up to that point independently of the system prompt. ToolDefinition currently has no cache_control field, so callers have no way to cache the tools layer. This adds the field following the same pattern already used by SystemContent and the message Content variants. - Add `pub cache_control: Option<CacheControl>` to `ToolDefinition` with `#[serde(skip_serializing_if = "Option::is_none")]` so it is absent from requests that do not use caching. - Initialize `cache_control: None` at the two ToolDefinition construction sites (completion.rs and streaming.rs TryFrom impls).
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Stacked this pr into #1815 |
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Summary
Anthropic supports caching the tools layer by setting
cache_controlon the lastToolDefinitionin the array.ToolDefinitioncurrently has no such field — this is the only cacheable layer not yet exposed in rig.SystemContentand the messageContentvariants already havecache_control. This bringsToolDefinitionin line with the same pattern.Changes
pub cache_control: Option<CacheControl>toToolDefinitionwith#[serde(skip_serializing_if = "Option::is_none")].cache_control: Noneat the twoToolDefinitionconstruction sites in theTryFromimpls (completion.rsandstreaming.rs).No behaviour change for existing callers — the field defaults to
Noneand is omitted from serialization when unset.AI Assistance
This implementation was developed with significant AI assistance (Claude). The change and rationale were reviewed and validated by the author before submission.
Issue
Fixes #1811