deepseek-ai/deepseek-harness · error · HarnessError

GOAL_TOOL_DRIVER_REQUIRED

GOAL_TOOL_DRIVER_REQUIRED

Error message

goal tools require an open model turn

What it means

Error "goal tools require an open model turn" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/goal/tool-goal/src/authority.ts:26

import type { ToolRunContext } from '@deepseek-ai/dsh-tools'

type TurnStartEvent = Extract<SessionEvent, { type: 'turn/start' }>

/** Current open turn plus the events accepted after its start boundary. */
export interface GoalToolExecution {
  readonly agent: Agent
  readonly start: TurnStartEvent
  readonly events: readonly SessionEvent[]
}

/** Hard authority granted to one state-changing call. */
export type GoalToolAuthority =
  | { readonly kind: 'direct-human' }
  | { readonly kind: 'goal-round'; readonly goal: GoalView }

/** Throw one structured tool-policy failure. */
function reject(message: string, code = 'GOAL_TOOL_AUTHORITY_REQUIRED'): never {
  throw new HarnessError(message, code)
}

/** Locate the open turn enclosing a model tool call. */
function openTurn(agent: Agent): { start: TurnStartEvent; events: readonly SessionEvent[] } {
  const events = agent.session.events
  for (let index = events.length - 1; index >= 0; index -= 1) {
    const boundary = events[index]
    if (boundary?.type === 'turn/end') {
      reject('goal tools require an open model turn', 'GOAL_TOOL_DRIVER_REQUIRED')
    }
    if (boundary?.type === 'turn/start') {
      return { start: boundary, events: events.slice(index + 1) }
    }
  }
  return reject('goal tools require an open model turn', 'GOAL_TOOL_DRIVER_REQUIRED')
}

/**

View on GitHub (pinned to b150a551b8)

When it happens

Trigger: Thrown at packages/goal/tool-goal/src/authority.ts:26 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/4b32c41cc4907153. Report an issue: GitHub.