Model & effort

The first two positional slots take a model alias and an effort level. fnc turns them into flags before claude sees the arguments:

fnc opus max ~/src/proj     # --model opus --effort max
fnc sonnet ~/src/proj       # --model sonnet
fnc high ~/src/proj         # effort alone implies opus
fnc ~/src/proj              # no model flag; claude picks its default

Slot	Words
Model alias	opus, sonnet, haiku, fable
Effort level	low, medium, high, xhigh, max, auto

The words are read left to right at the head of argv, before any flag. A directory named opus is reachable as ./opus.

Across a restart

fnc_restart relaunches the session in place with the conversation intact, and takes model and effort among its optional overrides. Leave them out and the startup values carry over.

Effort is the one worth passing every time. claude updates $CLAUDE_EFFORT when you run /effort, so a shell can read the live level, but fnclaude cannot see it any other way. The tool descriptions tell the model to read that variable before calling.