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

unsupported tool

Error message

unsupported tool

What it means

Error "unsupported tool" thrown in rohitg00/ai-engineering-from-scratch.

Source

Thrown at certifications/claude/lessons/30-developer-application-capstone/code/main.py:151

        }


class LeastPrivilegeGate:
    def allow(self, tool: str, arguments: dict[str, Any], approved: bool = False) -> tuple[bool, str]:
        if tool == "lookup_order" and set(arguments) == {"order_id"}:
            return True, "read-only lookup"
        if tool == "issue_refund":
            return (approved, "explicit approval required" if not approved else "approved refund")
        return False, "capability or arguments not allowlisted"


class ToolRegistry:
    def __init__(self, orders: dict[str, str]) -> None:
        self.orders = dict(orders)

    def call(self, tool: str, arguments: dict[str, Any]) -> dict[str, Any]:
        if tool != "lookup_order":
            raise ValueError("unsupported tool")
        order_id = arguments["order_id"]
        if order_id not in self.orders:
            return {"found": False, "order_id": order_id}
        return {"found": True, "order_id": order_id, "status": self.orders[order_id]}


class SupportAgent:
    def __init__(self, registry: ToolRegistry, gate: LeastPrivilegeGate | None = None) -> None:
        self.registry = registry
        self.gate = gate or LeastPrivilegeGate()

    def run(self, request: str) -> SupportResult:
        trace: list[TraceEvent] = [TraceEvent("request_received", {"length": len(request)})]
        injection_markers = ("ignore previous", "reveal secret", "read .env", "bypass approval")
        if any(marker in request.lower() for marker in injection_markers):
            trace.append(TraceEvent("policy_denial", {"reason": "instruction injection marker"}))
            return SupportResult("denied", "I cannot follow instructions that bypass policy or request secrets.", None, True, tuple(trace))

View on GitHub (pinned to 39ea8a1c6d)

When it happens

Trigger: Thrown at certifications/claude/lessons/30-developer-application-capstone/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/00ddb595521dadbe. Report an issue: GitHub.