feat(core, cli): Add support for agents in settings.json. (#16433)

packages/cli/src/config/config.ts

@@ -660,6 +660,7 @@ export async function loadCliConfig(
     mcpServers: mcpEnabled ? settings.mcpServers : {},
     mcpEnabled,
     extensionsEnabled,
+    agents: settings.agents,
     allowedMcpServers: mcpEnabled
       ? (argv.allowedMcpServerNames ?? settings.mcp?.allowed)
       : undefined,

packages/cli/src/config/settingsSchema.ts

@@ -785,6 +785,32 @@ const SETTINGS_SCHEMA = {
     },
   },
 
+  agents: {
+    type: 'object',
+    label: 'Agents',
+    category: 'Advanced',
+    requiresRestart: true,
+    default: {},
+    description: 'Settings for subagents.',
+    showInDialog: false,
+    properties: {
+      overrides: {
+        type: 'object',
+        label: 'Agent Overrides',
+        category: 'Advanced',
+        requiresRestart: true,
+        default: {},
+        description:
+          'Override settings for specific agents, e.g. to disable the agent, set a custom model config, or run config.',
+        showInDialog: false,
+        additionalProperties: {
+          type: 'object',
+          ref: 'AgentOverride',
+        },
+      },
+    },
+  },
+
   context: {
     type: 'object',
     label: 'Context',
@@ -2002,6 +2028,36 @@ export const SETTINGS_SCHEMA_DEFINITIONS: Record<
       },
     },
   },
+  AgentOverride: {
+    type: 'object',
+    description: 'Override settings for a specific agent.',
+    additionalProperties: false,
+    properties: {
+      modelConfig: {
+        type: 'object',
+        additionalProperties: true,
+      },
+      runConfig: {
+        type: 'object',
+        description: 'Run configuration for an agent.',
+        additionalProperties: false,
+        properties: {
+          maxTimeMinutes: {
+            type: 'number',
+            description: 'The maximum execution time for the agent in minutes.',
+          },
+          maxTurns: {
+            type: 'number',
+            description: 'The maximum number of conversational turns.',
+          },
+        },
+      },
+      disabled: {
+        type: 'boolean',
+        description: 'Whether to disable the agent.',
+      },
+    },
+  },
   CustomTheme: {
     type: 'object',
     description: