Testing the Puppeteer MCP server initially seemed successful, as connections were established and tools appeared without errors. However, once the agent began operating, issues emerged with actions like clicks appearing to work but not being recognized downstream, leading to repeated steps. The root cause was traced to Puppeteer tools not clearly declaring their returns and relying on vague parameters or implicit contexts, causing silent confusion for agents. This highlights the importance of thorough validation of MCP servers before runtime to prevent such issues, as demonstrated using a tool called Syrin for analysis. Understanding these nuances is crucial for ensuring seamless automation processes and preventing hidden operational failures.
