Develop Custom Tools and Integrate Portkey

Create custom tools for your CrewAI agents, such as a `SearchTool` for general web research or a `FinancialDataTool` that simulates fetching market data. Ensure these tools handle input/output appropriately for agents. Integrate Portkey to manage your GPT-4o API calls; explain how you would configure it for cost monitoring, performance optimization, and potentially rate limiting across agent interactions. Provide Python code for tool definitions and Portkey integration.