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from __future__ import annotations
from typing import Mapping
from duckduckgo_search import DDGS
from backend.mcp_server.common.tenant import TenantContext
from backend.mcp_server.common.utils import ToolExecutionError, ToolValidationError, tool_handler
@tool_handler("web.search")
async def web_search(context: TenantContext, payload: Mapping[str, object]) -> dict[str, object]:
"""
Perform a DuckDuckGo web search with an English-results bias.
"""
query = payload.get("query")
if not isinstance(query, str) or not query.strip():
raise ToolValidationError("query must be a non-empty string")
max_results = payload.get("max_results", 5)
try:
max_results_value = max(1, min(int(max_results), 10))
except (TypeError, ValueError):
raise ToolValidationError("max_results must be an integer between 1 and 10")
region = str(payload.get("region", "us-en"))
try:
ddg = DDGS()
query_string = query
if "lang:en" not in query_string.lower():
query_string = f"{query_string} lang:en"
try:
results = ddg.text(query_string, max_results=max_results_value, region=region)
except TypeError:
results = ddg.text(query_string, max_results=max_results_value)
formatted = [
{
"title": item.get("title"),
"snippet": item.get("body"),
"url": item.get("href"),
}
for item in results
]
return {
"query": query,
"results": formatted,
"metadata": {"max_results": max_results_value, "region": region},
}
except Exception as exc:
raise ToolExecutionError(f"web search failed: {exc}") from exc
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