Worked on the Qiskit/qiskit repository to enhance the SynthesizeRZRotations component by clarifying and enforcing valid input ranges for error parameters. Focused on improving user guidance and reliability, the developer updated documentation to specify precise numerical ranges for synthesis_error and cache_error, helping users avoid misconfiguration in quantum circuit synthesis. Implemented input validation in Python to reject negative error values, thereby hardening the function against invalid inputs. Leveraged skills in documentation, Python, and quantum computing to deliver these changes, which included related Reno documentation updates to support the new input rules and ensure consistent, accurate usage across the codebase.