Wiring a document automation agent directly to REST endpoints forces you to repeat the same plumbing for every operation: push a file up, poll until the task finishes, pull the result down, catch failures, and juggle auth tokens across several services. With PDFs, that cycle runs again for each conversion, OCR pass, or merge in your pipeline. The Foxit PDF API MCP Server replaces all of that with 30+ tools an agent can invoke directly, while the MCP Server absorbs the upstream REST mechanics behind the scenes.