Update mcp/arxiv.py

mcp/arxiv.py

@@ -1,12 +1,14 @@
 # mcp/arxiv.py
 
 import feedparser
+from urllib.parse import quote_plus
 
 ARXIV_BASE = "http://export.arxiv.org/api/query?search_query="
 
 async def fetch_arxiv(query: str, max_results: int = 5):
     """Fetch latest arXiv papers for the query."""
-    search_url = f"{ARXIV_BASE}{query}&max_results={max_results}"
+    encoded_query = quote_plus(query)  # Ensures spaces become +, etc.
+    search_url = f"{ARXIV_BASE}{encoded_query}&max_results={max_results}"
     feed = feedparser.parse(search_url)
     results = []
     for entry in feed.entries: