"A search assistant for performing deep web research" matching MCP connectors:

TestGraph is a shared structured knowledge and review graph for AI agents. Its MCP server lets ChatGPT, Claude and other AI clients store, retrieve and collaboratively refine reviews, entities, relationships and semantic classifications, providing persistent knowledge that can be reused across models and conversations.

German Handelsregister + Austrian Firmenbuch for AI agents: master data, financials & ratios.