fix(core): list default agent first

packages/core/src/agent.ts

@@ -122,7 +122,10 @@ const layer = Layer.effect(
         return { id: info?.id ?? defaultID, info }
       }),
       list: Effect.fn("Agent.list")(function* () {
-        return Array.fromIterable(state.get().agents.values())
+        const agents = Array.fromIterable(state.get().agents.values())
+        const selected = selectedDefault()
+        if (!selected) return agents
+        return [selected, ...agents.filter((agent) => agent.id !== selected.id)]
       }),
     })
   }),

packages/core/src/workspace/driver.ts

@@ -55,7 +55,7 @@ export class RegistryService extends Context.Service<RegistryService, Registry>(
 
 export const registry = (drivers: Readonly<Record<string, Interface>>): Registry => ({
   get: (provider) => {
-    const driver = drivers[provider]
+    const driver = Object.hasOwn(drivers, provider) ? drivers[provider] : undefined
     return driver ? Effect.succeed(driver) : Effect.fail(new ProviderNotFound({ provider }))
   },
 })

packages/core/test/agent.test.ts

@@ -68,6 +68,26 @@ describe("Agent", () => {
     }),
   )
 
+  it.effect("lists the selected default agent first", () =>
+    Effect.gen(function* () {
+      const agent = yield* Agent.Service
+      yield* agent.transform((editor) => {
+        editor.update(Agent.ID.make("build"), (info) => {
+          info.mode = "primary"
+        })
+        editor.update(Agent.ID.make("reviewer"), (info) => {
+          info.mode = "primary"
+        })
+        editor.update(Agent.ID.make("explore"), (info) => {
+          info.mode = "subagent"
+        })
+        editor.default(Agent.ID.make("reviewer"))
+      })
+
+      expect((yield* agent.list()).map((info) => String(info.id))).toEqual(["reviewer", "build", "explore"])
+    }),
+  )
+
   it.effect("rebuilds state when a transform is replaced", () =>
     Effect.gen(function* () {
       const agent = yield* Agent.Service

packages/core/test/workspace.test.ts

@@ -48,6 +48,18 @@ beforeEach(() => {
   failConnect = false
 })
 
+it.effect("rejects unregistered workspace providers", () =>
+  Effect.gen(function* () {
+    const registry = WorkspaceDriver.registry({ fake: driver })
+
+    for (const provider of ["missing", "constructor", "toString", "__proto__"]) {
+      expect(yield* registry.get(provider).pipe(Effect.flip)).toEqual(
+        new WorkspaceDriver.ProviderNotFound({ provider }),
+      )
+    }
+  }),
+)
+
 it.effect("persists the workspace lifecycle and reconnects after idle suspension", () =>
   Effect.gen(function* () {
     const workspace = yield* Workspace.Service

packages/tui/src/routes/session/index.tsx

@@ -2089,6 +2089,7 @@ function UserMessage(props: { message: SessionMessageUser }) {
 
 function QueuedPromptDock(props: { prompts: { id: string; text: string }[]; onOpen: () => void }) {
   const theme = useTheme("elevated")
+  const [hover, setHover] = createSignal(false)
   const next = createMemo(() => props.prompts[0]?.text.replaceAll("\n", " "))
 
   return (
@@ -2096,6 +2097,8 @@ function QueuedPromptDock(props: { prompts: { id: string; text: string }[]; onOp
       border={["left"]}
       borderColor={theme.border.default}
       customBorderChars={SplitBorder.customBorderChars}
+      onMouseOver={() => setHover(true)}
+      onMouseOut={() => setHover(false)}
       onMouseUp={props.onOpen}
     >
       <box
@@ -2104,7 +2107,7 @@ function QueuedPromptDock(props: { prompts: { id: string; text: string }[]; onOp
         paddingBottom={1}
         paddingLeft={2}
         paddingRight={1}
-        backgroundColor={theme.background.default}
+        backgroundColor={hover() ? theme.raise(theme.background.default) : theme.background.default}
         flexDirection="row"
       >
         <text fg={theme.text.subdued} wrapMode="none" truncate flexGrow={1} flexShrink={1} minWidth={0}>