Enforce strict tool usage for weather_time_agent

[vinodnextcoder]

This change rigorously enforces the agent's STRICT REFUSAL RULE. By limiting the agent's capabilities to only time and weather retrieval, we eliminate the risk of the LLM overriding the system instructions to answer off-topic queries using the general search tool. This ensures the agent behaves predictably and adheres strictly to its defined single purpose.

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Summary of Changes

Hello @vinodnextcoder, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request strengthens the weather_time_agent's adherence to its defined role by implementing a rigorous refusal rule. By making the agent's instructions more explicit about its singular focus on time and weather queries, it prevents the underlying Large Language Model from misinterpreting or overriding system instructions to engage with off-topic questions using general search capabilities, thereby ensuring predictable and focused agent behavior.

Highlights

• Agent Instruction Enhancement: The weather_time_agent's instruction has been updated to explicitly state its sole purpose of answering questions about time and weather, and to strictly refuse any unrelated queries.

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