CMRNLP-38 Define JSON Schemas for tool I/O under /schemas

[cli620]

Summary

Implemented JSON Schema validation for MCP tool inputs and outputs to ensure consistent data contracts across all tools.

What Changed

1. Schema Structure

Created schemas/ directory with the following organization:

schemas/
├── <tool_name>/
│   ├── input.json    # JSON Schema for tool input validation
│   └── output.json   # JSON Schema for tool output validation
└── README.md         # Documentation and best practices

2. Schema Validator (mcp/schema_validator.py)

Implemented automated validation system that:

• Loads JSON schemas for each tool
• Validates tool inputs against input.json schema
• Validates tool outputs against output.json schema
• Provides CLI for batch validation: python3 -m mcp.schema_validator --all

3. Example Implementation

Implemented schemas for temporal_ranges tool as reference example

Testing

# Validate all schemas
uv run schema_validator

## [CMRNLP-38](https://bugs.earthdata.nasa.gov/browse/CMRNLP-38)