rohitg00/ai-engineering-from-scratch · error · ValueError

required must be list[str]

Error message

required must be list[str]

What it means

Error "required must be list[str]" thrown in rohitg00/ai-engineering-from-scratch.

Source

Thrown at phases/19-capstone-projects/21-tool-registry-schema-validation/code/main.py:151

        raise ValueError("minLength cannot be greater than maxLength")
    pattern = schema.get("pattern")
    if pattern is not None and not isinstance(pattern, str):
        raise ValueError("pattern must be a string")
    props = schema.get("properties")
    if props is not None:
        if not isinstance(props, dict):
            raise ValueError("properties must be a dict")
        for pname, psub in props.items():
            if not isinstance(pname, str):
                raise ValueError("property names must be strings")
            validate_schema_shape(psub)
    items = schema.get("items")
    if items is not None:
        validate_schema_shape(items)
    req = schema.get("required")
    if req is not None:
        if not isinstance(req, list) or not all(isinstance(x, str) for x in req):
            raise ValueError("required must be list[str]")


def _path(prefix: str, segment: str | int) -> str:
    seg = str(segment).replace("~", "~0").replace("/", "~1")
    return f"{prefix}/{seg}"


def _type_matches(value: Any, expected: str) -> bool:
    types = PRIMITIVE_TYPE_MAP[expected]
    if expected == "boolean":
        return isinstance(value, bool)
    if expected in ("integer", "number"):
        if isinstance(value, bool):
            return False
        return isinstance(value, types)
    return isinstance(value, types)

View on GitHub (pinned to 39ea8a1c6d)

When it happens

Trigger: Thrown at phases/19-capstone-projects/21-tool-registry-schema-validation/code/main.py:151 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of rohitg00/ai-engineering-from-scratch@39ea8a1c6d (2026-08-26). Data as JSON: /api/errors/774541dd3d94c496. Report an issue: GitHub.