fix: add default value for load_skills parameter in task tool (#1493)

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/tools/delegate-task/tools.ts

@@ -74,7 +74,7 @@ Prompts MUST be in English.`
   return tool({
     description,
     args: {
-      load_skills: tool.schema.array(tool.schema.string()).describe("Skill names to inject. REQUIRED - pass [] if no skills needed, but IT IS HIGHLY RECOMMENDED to pass proper skills like [\"playwright\"], [\"git-master\"] for best results."),
+      load_skills: tool.schema.array(tool.schema.string()).default([]).describe("Skill names to inject. Pass [] if no skills needed, but IT IS HIGHLY RECOMMENDED to pass proper skills like [\"playwright\"], [\"git-master\"] for best results."),
       description: tool.schema.string().describe("Short task description (3-5 words)"),
       prompt: tool.schema.string().describe("Full detailed prompt for the agent"),
       run_in_background: tool.schema.boolean().describe("true=async (returns task_id), false=sync (waits). Default: false"),
@@ -97,7 +97,7 @@ Prompts MUST be in English.`
         throw new Error(`Invalid arguments: 'run_in_background' parameter is REQUIRED. Use run_in_background=false for task delegation, run_in_background=true only for parallel exploration.`)
       }
       if (args.load_skills === undefined) {
-        throw new Error(`Invalid arguments: 'load_skills' parameter is REQUIRED. Pass [] if no skills needed, but IT IS HIGHLY RECOMMENDED to pass proper skills like ["playwright"], ["git-master"] for best results.`)
+        args.load_skills = []
       }
       if (args.load_skills === null) {
         throw new Error(`Invalid arguments: load_skills=null is not allowed. Pass [] if no skills needed, but IT IS HIGHLY RECOMMENDED to pass proper skills.`)