HR startup Rippling filed a lawsuit Monday accusing MCP gateway startup Runlayer of infringing on three of its patents, according to the lawsuit seen by TechCrunch. The filing comes after Runlayer sued the HR startup last month, accusing it of breach of contract and stealing its product ideas. It’s the latest saga between the two companies after Rippling spent nearly a year testing the startup’s MCP product. Instead, Rippling built its own MCP server, and will soon offer it as a product that competes with Runlayer. On Rippling’s side, perhaps the most dramatic claim is that it informed Runlayer of the patents it believed Runlayer had infringed soon after the startup filed its lawsuit.