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feat(core) ModelInfo.model_instructions_template (#9597)

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## Summary
#9555 is the start of a rename, so I'm starting to standardize here.
Sets up `model_instructions` templating with a strongly-typed object for
injecting a personality block into the model instructions.

## Testing
- [x] Added tests
- [x] Ran locally
This commit is contained in:
Dylan Hurd
2026-01-21 18:11:18 -08:00
committed by GitHub
parent a489b64cb5
commit 96a72828be
15 changed files with 232 additions and 42 deletions
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5
codex-rs/core/src/context_manager/history.rs
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@@ -86,8 +86,9 @@ impl ContextManager {
// This is a coarse lower bound, not a tokenizer-accurate count.
pub(crate) fn estimate_token_count(&self, turn_context: &TurnContext) -> Option<i64> {
let model_info = turn_context.client.get_model_info();
let base_instructions = model_info.base_instructions.as_str();
let base_tokens = i64::try_from(approx_token_count(base_instructions)).unwrap_or(i64::MAX);
let personality = turn_context.client.config().model_personality;
let base_instructions = model_info.get_model_instructions(personality);
let base_tokens = i64::try_from(approx_token_count(&base_instructions)).unwrap_or(i64::MAX);
let items_tokens = self.items.iter().fold(0i64, |acc, item| {
acc + match item {