[EIE] Add STAC item search tool

[paridhi-parajuli]

Summary

Add MCP-compatible tool for searching items from STAC given a collection_id, temporal and spatial range.

What it does

• Supports filtering by collection_id, spatial range (bbox), temporal range (datetime), result limit (limit)
• Uses the search method from the pystac_client
• Returns structured output: item_ids, count, error
• Registers with the MCP tool registry via @mcp_tool decorator

Files changed

• akd_ext/tools/stac_item_search.py — New tool implementation
• akd_ext/tools/init.py — Added exports
• pyproject.toml — Added pystac-client as dependency

Testing

import asyncio

from akd_ext.tools.eie.stac_item_search import (
    STACItemSearchTool,
    STACItemSearchInputSchema,
)


async def test_tool():
    tool = STACItemSearchTool()

    params = STACItemSearchInputSchema(
        collections=["no2-monthly"],
        bbox=[-125.0, 24.5, -66.9, 49.5],
        datetime="2021-01-01/2021-12-31",
        limit=5,
    )

    result = await tool.arun(params)

    print("Result:")
    print("Item IDs:", result.item_ids)
    print("Count:", result.count)
    print("Error:", result.error)


async def main():
    await test_tool()


if __name__ == "__main__":
    asyncio.run(main())