Worked on the thingsboard/langchain4j repository to enhance the reliability of automated workflows by addressing a critical bug in the MCP tool’s argument handling. Focused on Java development with an emphasis on API integration and JSON handling, the work involved modifying the MCP tool so that when invoked without arguments, it returns an empty JSON object rather than an empty string. This change prevented MismatchedInputException errors during JSON parsing, allowing tool execution to proceed smoothly and reducing downstream failures. The solution improved the stability of tool invocations and decreased support issues related to edge-case argument handling in automated processes.