1ff662c7c39d3d827c001737ed747ae89d408757
Output is about an eighth of what a session costs and thinking is nearly all of it -- prose is ~1.5% of output tokens, measured over 27,015 requests of this account's own transcripts -- so the level is the largest saving available short of shortening the conversation itself. Shaped like the working directory rather than like the model: the CLI's only two setting control requests are `set_model` and `set_permission_mode` (checked against the 2.1.258 binary), so `--effort` is read when the process launches and cannot be asked of a running one. `set_session_effort` records the level and stops the process; the next message or Start launches one that has it. That is also why the picker is in the session settings dialog beside Move, and not on the bar beside the model and the mode, which take effect mid-turn. `None` is a level in its own right -- the CLI's own default -- so the picker can return to it, and a blank is normalized to it at the boundary rather than stored as a level the CLI would reject. Offered only where it means something: `DriverKind::takes_effort` reports the capability and the phone leaves the row out entirely, rather than the session-type branch this app does not have anywhere else. A llama session would otherwise get a control whose only effect is stopping its process. Verified on the emulator against the sandbox's fake CLI: the picker sets it, the server reports it, and an echo session's dialog is unchanged. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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