feat(cli): add /fast to toggle between main and cheap model#200
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emal-avala merged 1 commit intomainfrom Apr 23, 2026
Merged
feat(cli): add /fast to toggle between main and cheap model#200emal-avala merged 1 commit intomainfrom
emal-avala merged 1 commit intomainfrom
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Cost control without leaving the REPL. `/fast` swaps `api.model` with a configured `api.fast_model` (or a provider-aware default) for the rest of the session; `/fast` again reverts. > /fast Fast mode enabled. Model: 'claude-opus-4-7' → 'claude-haiku-4-5'. Run /fast again to revert. > /fast Fast mode disabled. Model restored to 'claude-opus-4-7'. New config field: [api] model = "claude-opus-4-7" fast_model = "claude-haiku-4-5" # explicit — overrides default When `fast_model` is not configured, `default_fast_model()` picks a provider-aware fallback: opus / sonnet → claude-haiku-4-5 gpt-5 → gpt-5-mini gpt-4 → gpt-4-mini gemini → gemini-flash grok → grok-mini (other) → "haiku" (forces user to configure explicitly) Implementation: AppState gains `pre_fast_model: Option<String>` (session-local, not persisted). `Some` ⇔ currently in fast mode; the pre-swap model is restored on the next toggle. No-op guard when the fast model equals the current model (prevents silent loss of the restore target). Tests: 5 unit tests covering provider fallbacks and case insensitivity in `default_fast_model`, plus `test_new_state` verifies the new `pre_fast_model: None` default.
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Summary
Cost control without leaving the REPL.
/fastswapsapi.modelwith a configuredapi.fast_model(or a provider-aware default) for the rest of the session;/fastagain reverts.New config field
When
fast_modelis not configured,default_fast_model()picks a provider-aware fallback:your-fast-modelgpt-5-minigpt-4-minigemini-flashgrok-minihaiku(prompts user to configure explicitly)Implementation
ApiConfiggainsfast_model: Option<String>, defaultNoneAppStategainspre_fast_model: Option<String>— session-local,Some⇔ currently in fast mode/fastswap logic: save current, replace with fast_model; on second toggle, restore frompre_fast_modelfast_model == current_model(prevents silent loss of the restore target)Test plan
cargo fmt --all— cleancargo clippy --workspace --all-targets -- -D warnings— cleancargo test -p agent-code --bin agent default_fast_model— 5/5 pass (provider fallbacks, case insensitivity, unknown provider)cargo test -p agent-code-lib --lib state— 10/10 pass (newpre_fast_model: Nonedefault assertion)