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

invalidationRule is required

Error message

invalidationRule is required

What it means

Error "invalidationRule is required" thrown in rohitg00/ai-engineering-from-scratch.

Source

Thrown at certifications/claude/lessons/04-context-knowledge-memory-and-caching/code/main.py:74

                errors.append(f"cached source is not active, stable, and eligible: {identifier}")
            elif source.get("sensitivity") == "restricted":
                errors.append(f"restricted source cannot enter cached prefix: {identifier}")
    budget = registry.get("promptBudget")
    if not isinstance(budget, dict) or not isinstance(budget.get("maximumTokens"), int):
        errors.append("promptBudget is invalid")
    else:
        used = sum(value for key, value in budget.items() if key != "maximumTokens" and isinstance(value, int))
        if used > budget["maximumTokens"]:
            errors.append("prompt budget exceeds maximumTokens")
    if not str(registry.get("invalidationRule", "")).strip():
        errors.append("invalidationRule is required")
    return errors


def build_context_plan(registry: dict[str, Any]) -> dict[str, Any]:
    errors = validate_registry(registry)
    if errors:
        raise ValueError("; ".join(errors))
    cached = set(registry["cachedPrefixSourceIds"])
    return {
        "cachedPrefix": [source["id"] for source in registry["sources"] if source["id"] in cached],
        "dynamicContext": [source["id"] for source in registry["sources"] if source["status"] == "active" and source["id"] not in cached],
        "retired": [source["id"] for source in registry["sources"] if source["status"] != "active"],
        "budgetRemaining": registry["promptBudget"]["maximumTokens"] - sum(value for key, value in registry["promptBudget"].items() if key != "maximumTokens"),
    }


def _iso_date(value: Any) -> bool:
    try:
        date.fromisoformat(value)
        return isinstance(value, str)
    except (TypeError, ValueError):
        return False


def load_registry(path: Path) -> dict[str, Any]:

View on GitHub (pinned to 39ea8a1c6d)

When it happens

Trigger: Thrown at certifications/claude/lessons/04-context-knowledge-memory-and-caching/code/main.py:74 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/c7c223ba5001c0b6. Report an issue: GitHub.