cmux NEXT model picker: list every harness, installed or not (Install… row)

Merged
TE
4d ago
+257-24

Leo-ask: ask-0f0e9e4d6c

Leo, 2026-10-26: "show all harnesses, all models (pi, opencode, prime intellect, etc…)"

What changes

The model picker dropped every model-catalog harness this Mac does not have (composerPickerEntries marks them pickable: false, and uniqueHarnesses skipped them). So Pi, OpenCode, Gemini CLI and Vercel AI Gateway never appeared unless installed.

Now they are flagged notInstalled and listed after the installed harnesses:

  • Compact menu: the tab shows the harness's catalog models (greyed out, not pickable), a "Not installed" note and an Install… row that opens the Harnesses page. The tab's tooltip reads "Gemini CLI · Not installed".
  • Full picker: the tab shows the note and Install….
  • The picker's face (the default harness for a new chat), search, Starred and every pick path skip them, so a pick can never start a chat on a harness that isn't installed.

Design spec: leo-workspace design/model-picker.md (no settled rule is changed; this adds tabs, it removes none).

Follow-up (separate PR, needs a model-catalog data migration): add catalog rows for the other harnesses acpmux runs but the catalog doesn't name yet (Prime Intellect, oh-my-pi, Grok, Cursor, Hermes, DeepSeek), so they also show when not installed. When installed, acpmux already lists them.

Verification

  • bun test test/model-picker-all-harnesses.test.tsx: red on base (2 of 3 fail), green on head.
  • Neighbouring picker suites (test/model-menu-*.test.tsx, test/model-picker-*.test.tsx, QuickModelMenu.test.tsx, modelCatalog.local.test.ts): 94 pass.
  • bun run typecheck and vp lint clean. check:design-tokens / check:type-scale are red on base in files this PR doesn't touch.

Observed / Not run

Observed: the JSDOM tests above. Not run: a DEV build. No capture: Leo tries the build.

Changelog

  • Changed: The model picker lists every harness, including ones not installed yet, with an Install… row.

risk: normal (picker UI, one component area)

Agent session: agent session

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Summary by cubic

The model picker now lists catalog harnesses even when they aren’t installed, instead of hiding them. Both picker views show their catalog models as unavailable, with a “Not installed” note and an Install… action that opens the Harnesses page.

  • Uninstalled harnesses remain excluded from the default selection, search, Starred, and all chat and model pick paths.
  • Adds tests for default selection, composer flags, and the compact menu’s disabled models and Install action.