Definition: "I can parse what you wrote, but it doesn't make sense" - violations of meaning or contracts within a correctly structured format. The parser successfully extracts function calls, but they violate tool contracts or constraints.
Characteristics:
- Structure (syntax) is valid but violates the tool's interface specification
- Parser can extract the function call
- Validation against tool definition fails
- There exists a potential tool definition that would make this call valid but it is not the one that is in the system prompt