Dynamic Profiles historyTransform
Parent: Mac local LLMs: Apple Foundation Models and Core AI · Published reference · snapshot 2026-10-05 · viability 3.75 / 5 (skip)
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Apple's DynamicProfile page says historyTransform performs stateless transcript transforms that change the transcript sent to the model but not the global transcript state.
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Facts
- Apple's DynamicProfile page says historyTransform performs stateless transcript transforms that change the transcript sent to the model but not the global transcript state. [source]
- Apple's documented example keeps only the last twenty entries: `.historyTransform { history in Array(history.suffix(20)) }`. [source]
- A DynamicProfile body must resolve to a single active Profile; the profile-level modifiers include model, temperature, samplingMode, reasoningLevel, maximumResponseTokens, historyTransform and onResponse. [source]
- Modifier precedence runs: call-site GenerationOptions passed to respond(to:options:), then the modifier closest to the Profile declaration, then outer modifiers. [source]
- Call-site GenerationOptions override only matching generation values and never replace the profile's model, historyTransform or lifecycle callbacks. [source]
- Precedence resolves only conflicts: a historyTransform or maximumResponseTokens with no competing value in the chain applies regardless of modifier order. [source]
- If a profile and an outer modifier both register onResponse, the framework runs both callbacks. [source]
- Reaching maximumResponseTokens stops generation without throwing, which can leave an incomplete sentence or malformed structured output. [source]
- Appending to a transcript usually preserves the KV cache, while removing entries, changing tools or swapping instructions can invalidate it. [source]
- The on-device context window is smaller than Private Cloud Compute's and can be read at runtime from SystemLanguageModel.default.contextSize. [source]
- Switching between a remote and the on-device model stops either model reusing the other's cache. [source]
- A sensible tool-heavy pattern is to drop completed tool interactions as whole units first, then apply a rolling window. [source]
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