fix: Clean company name suffixes before MCP server queries

- Add stock suffixes to filters: "- Common Stock", "- Class A/B/C", etc.
- Apply clean_company_name() in parse_research_request()
- Prevents polluted search queries like "Microsoft Corporation - Common Stock stock news"

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app.py

@@ -190,6 +190,10 @@ def parse_research_request(message: dict) -> tuple[Optional[str], Optional[str]]
         if not ticker:
             ticker = text.upper().replace(" ", "")[:5]
 
+    # Clean company name (strip "- Common Stock", "Inc.", etc.)
+    from configs.company_name_filters import clean_company_name
+    company_name = clean_company_name(company_name)
+
     return ticker, company_name
 
 

configs/company_name_filters.py

@@ -5,6 +5,12 @@ Add suffixes/prefixes here as new edge cases are discovered.
 
 # Suffixes to strip from company names (order matters - longer first)
 COMPANY_SUFFIXES = [
+    " - Common Stock",
+    " - Class A Common Stock",
+    " - Class B Common Stock",
+    " - Class C Common Stock",
+    " - Ordinary Shares",
+    " - American Depositary Shares",
     " Corporation",
     " Incorporated",
     " Technologies",