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

{path}: unexpected fields {unexpected}

Error message

{path}: unexpected fields {unexpected}

What it means

Error "{path}: unexpected fields {unexpected}" thrown in rohitg00/ai-engineering-from-scratch.

Source

Thrown at phases/14-agent-engineering/34-repo-memory-and-state/code/main.py:90

            return True
    return False


def validate(value: Any, schema: dict[str, Any], path: str = "$") -> None:
    if "type" in schema and not _check_type(value, schema["type"]):
        raise SchemaError(f"{path}: expected {schema['type']}, got {type(value).__name__}")
    if "enum" in schema and value not in schema["enum"]:
        raise SchemaError(f"{path}: {value!r} not in {schema['enum']}")
    if "pattern" in schema and isinstance(value, str) and not re.match(schema["pattern"], value):
        raise SchemaError(f"{path}: {value!r} does not match /{schema['pattern']}/")
    if isinstance(value, dict):
        for key in schema.get("required", []):
            if key not in value:
                raise SchemaError(f"{path}: missing required field {key!r}")
        properties = schema.get("properties", {})
        unexpected = sorted(set(value.keys()) - set(properties.keys()))
        if unexpected:
            raise SchemaError(f"{path}: unexpected fields {unexpected}")
        for key, sub in properties.items():
            if key in value:
                validate(value[key], sub, f"{path}.{key}")
    if isinstance(value, list) and "items" in schema:
        for idx, item in enumerate(value):
            validate(item, schema["items"], f"{path}[{idx}]")


def atomic_write(path: Path, content: str) -> None:
    path.parent.mkdir(parents=True, exist_ok=True)
    fd, tmp_name = tempfile.mkstemp(prefix=path.name + ".", dir=path.parent)
    try:
        with os.fdopen(fd, "w") as fh:
            fh.write(content)
            fh.flush()
            os.fsync(fh.fileno())
        os.replace(tmp_name, path)
    except Exception:

View on GitHub (pinned to 39ea8a1c6d)

When it happens

Trigger: Thrown at phases/14-agent-engineering/34-repo-memory-and-state/code/main.py:90 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/19e7bb251494abb1. Report an issue: GitHub.