feat(core): add default execution limits for subagents (#18274)

packages/core/src/agents/agentLoader.ts

@@ -10,7 +10,11 @@ import { type Dirent } from 'node:fs';
 import * as path from 'node:path';
 import * as crypto from 'node:crypto';
 import { z } from 'zod';
-import type { AgentDefinition } from './types.js';
+import {
+  type AgentDefinition,
+  DEFAULT_MAX_TURNS,
+  DEFAULT_MAX_TIME_MINUTES,
+} from './types.js';
 import { isValidToolName } from '../tools/tool-names.js';
 import { FRONTMATTER_REGEX } from '../skills/skillLoader.js';
 import { getErrorMessage } from '../utils/errors.js';
@@ -290,8 +294,8 @@ export function markdownToAgentDefinition(
       },
     },
     runConfig: {
-      maxTurns: markdown.max_turns,
-      maxTimeMinutes: markdown.timeout_mins || 5,
+      maxTurns: markdown.max_turns ?? DEFAULT_MAX_TURNS,
+      maxTimeMinutes: markdown.timeout_mins ?? DEFAULT_MAX_TIME_MINUTES,
     },
     toolConfig: markdown.tools
       ? {