Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It does disclose the critical side effect that it saves the editor buffer before compiling (persisting to the bound script). This is a non-obvious behavior that significantly affects outcomes. However, it does not mention what happens on compilation errors, whether chart state changes beyond adding the script, or if any return value is produced. The warning adds substantial value but leaves some behavioral gaps.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.