d883436395
Replace all undefined values with null in agent MCP tool responses to prevent JSON serialization issues that break the MCP client. Changes: - Update AgentInfo interface to use `| null` instead of optional `?` syntax - Convert undefined to null in listAgents(), getCurrentMode(), getAvailableModes() - Update all Zod schemas from .optional() to .nullable() - Fix tool responses in create_coding_agent and set_agent_mode This ensures all MCP tool responses properly serialize optional fields as null instead of undefined, preventing client-side errors. 🤖 Generated with [Claude Code](https://claude.ai/code) via [Happy](https://happy.engineering) Co-Authored-By: Claude <noreply@anthropic.com> Co-Authored-By: Happy <yesreply@happy.engineering>