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## Why `/fast` was wired as a one-off slash command even though model metadata now exposes service tiers as catalog data. That meant adding another tier, such as a slower/cheaper tier, would require more hardcoded TUI plumbing instead of letting the model catalog drive the available commands. This change makes service-tier commands data-driven: each advertised `service_tiers` entry becomes a `/name` command using the catalog description, while the request path sends the tier `id` only when the selected model supports it. ## What Changed - Removed the hardcoded `/fast` slash-command variant and introduced dynamic service-tier command items in the composer and command popup. - Added toggle behavior for service-tier commands: invoking `/name` selects that tier, and invoking it again clears the selection. - Preserved the existing Fast-mode keybinding/status affordances by resolving the current model tier whose name is `fast`, while still sending the tier request value such as `priority`. - Persisted service-tier selections as raw request strings so non-fast tiers can round-trip through config. - Updated the Bedrock catalog entry to advertise fast support through `service_tiers` with `id: "priority"` and `name: "fast"`. - Added defensive filtering in core so unsupported selected service tiers are omitted from `/responses` requests. ## Validation - Added/updated coverage for dynamic service-tier slash command lookup, popup descriptions, composer dispatch, TUI fast toggling, and unsupported-tier omission in core request construction. - Local tests were not run per request. --------- Co-authored-by: Codex <noreply@openai.com>