Standardize tool calls across LLMs

[msanatan]

Currently we use comments to indicate what a tool has. A more concise and precise way to let FastMCP know what our tools can do is to follow their guide: https://gofastmcp.com/servers/tools#parameter-metadata

Particularly:

• Add a description of the tool in the @mcp.tool() decorator
• Use the annotated type to add descriptions of each parameter
• Optionally, use Pydantic to validate the data we're accepting

This should address #273 and generally make our server much more compatible with MCP clients (it's definitely more compatible with Windsurf and VS Code using this format), and potentially more succinct space wise.