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

resume() unsupported from state {self.state.value}

Error message

resume() unsupported from state {self.state.value}

What it means

Error "resume() unsupported from state {self.state.value}" thrown in rohitg00/ai-engineering-from-scratch.

Source

Thrown at phases/19-capstone-projects/20-agent-harness-loop-contract/code/main.py:251

                self.state = State.EXECUTING
            else:
                self.state = State.REFLECTING
            return self._step()
        if self.state == State.AWAITING_TOOL:
            if payload is None:
                raise ValueError("resume from AWAITING_TOOL requires a payload")
            current = self._plan[self._cursor]
            if "error" in payload:
                current.error = str(payload["error"])
                self._emit("tool.error", {"step": current.id, "error": current.error})
                self.hooks.fire("on_error", {"step": current, "error": current.error})
            else:
                current.result = payload.get("result")
                self._emit("tool.result", {"step": current.id, "result": current.result})
            self.hooks.fire("after_tool_call", {"step": current})
            self._transition(State.REFLECTING)
            return self._step()
        raise RuntimeError(f"resume() unsupported from state {self.state.value}")

    def _begin_plan(self) -> PullRequest | SessionResult:
        self._transition(State.PLANNING)
        self.hooks.fire("before_plan", {"goal": self._goal, "history": list(self._history)})
        draft = self._planner(self._goal, list(self._history))
        self._emit("plan.draft", {"steps": [s.description for s in draft]})
        self.hooks.fire("after_plan", {"steps": draft})
        self._plan = draft
        self._cursor = 0
        self._emit("plan.commit", {"count": len(draft)})
        if not draft:
            return self._complete("no_plan")
        self._transition(State.EXECUTING)
        return self._step()

    def _step(self) -> PullRequest | SessionResult:
        if self.state == State.IDLE:
            return self._begin_plan()

View on GitHub (pinned to 39ea8a1c6d)

When it happens

Trigger: Thrown at phases/19-capstone-projects/20-agent-harness-loop-contract/code/main.py:251 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/a7ac8254840c1755. Report an issue: GitHub.