Fix cases where tools passed to internal agents fail (#2658)

## Summary

the required/additionalProperties fields are not carried over correctly.
This fixes it.

## Type of change

- [ ] Bug fix (If applicable, issue number: #____)
- [ ] New feature
- [ ] Breaking change
- [ ] Improvement
- [ ] Model update
- [ ] Other: _____________________

---

## Checklist

- [ ] Code complies with style guidelines
- [ ] Ran format/validation scripts (`./scripts/format.sh` and
`./scripts/validate.sh`)
- [ ] Self-review completed
- [ ] Documentation updated (comments, docstrings)
- [ ] Examples and guides: Relevant cookbook examples have been included
or updated (if applicable)
- [ ] Tested in clean environment
- [ ] Tests added/updated (if applicable)

---

## Additional Notes

Add any important context (deployment instructions, screenshots,
security considerations, etc.)

Author: dirkbrnd

libs/agno/agno/tools/function.py

@@ -210,6 +210,18 @@ def process_entrypoint(self, strict: bool = False):
                     if param.default == param.empty and name != "self" and name != "agent"
                 ]
 
+            if params_set_by_user:
+                self.parameters['additionalProperties'] = False
+                if strict:
+                    self.parameters["required"] = [name for name in self.parameters["properties"] if name != "agent"]
+                else:
+                    # Mark a field as required if it has no default value
+                    self.parameters["required"] = [
+                        name
+                        for name, param in sig.parameters.items()
+                        if param.default == param.empty and name != "self" and name != "agent"
+                    ]
+
             # log_debug(f"JSON schema for {self.name}: {parameters}")
         except Exception as e:
             log_warning(f"Could not parse args for {self.name}: {e}", exc_info=True)