fix(TUI): fix agent types agents modal (#1942)

3 files changed, 24 insertions, 26 deletions

diff --git a/packages/opencode/src/agent/agent.ts b/packages/opencode/src/agent/agent.ts
index 7f0831c08..98884abaf 100644
--- a/packages/opencode/src/agent/agent.ts
+++ b/packages/opencode/src/agent/agent.ts
@@ -13,6 +13,7 @@ export namespace Agent {
       name: z.string(),
       description: z.string().optional(),
       mode: z.union([z.literal("subagent"), z.literal("primary"), z.literal("all")]),
+      builtIn: z.boolean(),
       topP: z.number().optional(),
       temperature: z.number().optional(),
       permission: z.object({
@@ -58,6 +59,7 @@ export namespace Agent {
         options: {},
         permission: agentPermission,
         mode: "subagent",
+        builtIn: true,
       },
       build: {
         name: "build",
@@ -65,6 +67,7 @@ export namespace Agent {
         options: {},
         permission: agentPermission,
         mode: "primary",
+        builtIn: true,
       },
       plan: {
         name: "plan",
@@ -76,6 +79,7 @@ export namespace Agent {
           patch: false,
         },
         mode: "primary",
+        builtIn: true,
       },
     }
     for (const [key, value] of Object.entries(cfg.agent ?? {})) {
@@ -91,6 +95,7 @@ export namespace Agent {
           permission: agentPermission,
           options: {},
           tools: {},
+          builtIn: false,
         }
       const { model, prompt, tools, description, temperature, top_p, mode, permission, ...extra } = value
       item.options = {
diff --git a/packages/sdk/go/app.go b/packages/sdk/go/app.go
index 2771f6bd4..36d5be77f 100644
--- a/packages/sdk/go/app.go
+++ b/packages/sdk/go/app.go
@@ -72,6 +72,7 @@ func (r *AppService) Providers(ctx context.Context, opts ...option.RequestOption
 }
 
 type Agent struct {
+	BuiltIn     bool                   `json:"builtIn,required"`
 	Mode        AgentMode              `json:"mode,required"`
 	Name        string                 `json:"name,required"`
 	Options     map[string]interface{} `json:"options,required"`
@@ -87,6 +88,7 @@ type Agent struct {
 
 // agentJSON contains the JSON metadata for the struct [Agent]
 type agentJSON struct {
+	BuiltIn     apijson.Field
 	Mode        apijson.Field
 	Name        apijson.Field
 	Options     apijson.Field
diff --git a/packages/tui/internal/components/dialog/agents.go b/packages/tui/internal/components/dialog/agents.go
index 38a3d3599..c2cbd6450 100644
--- a/packages/tui/internal/components/dialog/agents.go
+++ b/packages/tui/internal/components/dialog/agents.go
@@ -76,20 +76,15 @@ func (a agentSelectItem) Render(
 
 	agentName := a.displayName
 
-	// For user agents and subagents, show description; for built-in, show mode
+	// Determine if agent is built-in or custom using the agent's builtIn field
 	var displayText string
-	if a.description != "" && (a.mode == "all" || a.mode == "subagent") {
-		// User agent or subagent with description
-		displayText = a.description
+	if a.agent.BuiltIn {
+		displayText = "(built-in)"
 	} else {
-		// Built-in without description - show mode
-		switch a.mode {
-		case "primary":
-			displayText = "(built-in)"
-		case "all":
+		if a.description != "" {
+			displayText = a.description
+		} else {
 			displayText = "(user)"
-		default:
-			displayText = ""
 		}
 	}
 
@@ -206,23 +201,19 @@ func (a *agentDialog) calculateOptimalWidth(agents []agentSelectItem) int {
 	for _, agent := range agents {
 		// Calculate the width needed for this item: "AgentName - Description" (visual improvement)
 		itemWidth := len(agent.displayName)
-		if agent.description != "" && (agent.mode == "all" || agent.mode == "subagent") {
-			// User agent or subagent - use description (capped to maxDescriptionLength)
-			descLength := len(agent.description)
-			if descLength > maxDescriptionLength {
-				descLength = maxDescriptionLength
-			}
-			itemWidth += descLength + 3 // " - "
+
+		if agent.agent.BuiltIn {
+			itemWidth += len("(built-in)") + 3 // " - "
 		} else {
-			// Built-in without description - use mode
-			var modeText string
-			switch agent.mode {
-			case "primary":
-				modeText = "(built-in)"
-			case "all":
-				modeText = "(user)"
+			if agent.description != "" {
+				descLength := len(agent.description)
+				if descLength > maxDescriptionLength {
+					descLength = maxDescriptionLength
+				}
+				itemWidth += descLength + 3 // " - "
+			} else {
+				itemWidth += len("(user)") + 3 // " - "
 			}
-			itemWidth += len(modeText) + 3 // " - "
 		}
 
 		if itemWidth > maxWidth {