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Will PflegerandGitHub
b0503d80c2
Registering a custom ACP harness works today, but only from Settings → Agents. Anyone whose first touchpoint is "New agent" has no way to discover the custom path — the dropdown just lists the baked-in presets plus whatever was registered earlier. This adds an inline "Add custom harness…" entry to the harness dropdown in all three agent surfaces: create, edit-definition (`AgentDefinitionDialog`), and instance edit (`AgentInstanceEditDialog`). The entry is a sentinel option (`ADD_CUSTOM_HARNESS_VALUE`, NUL-prefixed so it can never collide with a real harness id — backend ids match `[a-z0-9_][a-z0-9_-]*`), mirroring the `CUSTOM_ENTRY_ID` trick already used in `HarnessCatalogDialog`. Picking it never writes into form state; it opens `AddCustomHarnessDialog`, a thin modal wrapper hosting the existing `CustomHarnessForm` in `chromeless` mode. `CustomHarnessForm`'s `onSaved` now carries the saved `definition.id` (the form may rewrite it); the two existing call sites ignore the argument, so their behavior is unchanged. Selection after save is deferred rather than immediate. `usePendingHarnessSelection` holds the saved id until the runtime catalog actually publishes it via discovery, then selects it exactly once — so the dialog never selects an id it cannot render, and back-to-back registrations resolve correctly. The wait is scoped to the owning dialog's `open` state: both host dialogs stay mounted when closed, so an unpublished id is dropped on close rather than selecting into reset form state when discovery later catches up. Selection is routed through each dialog's normal dropdown change handler, so provider/model reset (and command pinning in the instance dialog) behave identically to a hand-picked harness. Dismissing the modal leaves the previous selection untouched. `AgentInstanceEditDialog`'s existing "Custom command" option is a different feature (ad-hoc command override vs. a registered reusable harness) and is untouched. Coverage is 16 unit tests in `addCustomHarness.test.mjs` (real React mount, following the existing `.test.mjs` pattern) plus 4 Playwright specs in `inline-custom-harness.spec.ts` covering all three surfaces end-to-end. Both suites were mutation-verified: treating the sentinel as a real selection, selecting before the catalog publishes, never clearing the pending id, ignoring the dialog's open state, and reversing latest-save-wins each turn the unit tests red; reverting the two dialog diffs turns all four e2e specs red. The `check-file-sizes.mjs` overrides for the two dialogs are ratcheted to their exact new counts (1048 and 1229) — verified tight in both directions, N passes and N−1 fails, so no headroom is introduced. --------- Signed-off-by: Will Pfleger <pfleger.will@gmail.com>