deepseek-ai/deepseek-harness · error

exit_plan_mode requires a calling agent (no session to switc

Error message

exit_plan_mode requires a calling agent (no session to switch)

What it means

Error "exit_plan_mode requires a calling agent (no session to switch)" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/plan/plan-mode/src/index.ts:360

    ctx.tools.register(defineTool({
      name: EXIT_PLAN_MODE,
      description: EXIT_DESCRIPTION,
      parameters: {
        plan: { type: 'string', required: true, description: 'The complete plan, as markdown, starting with a # heading that names it.' },
      },
      output: {
        schema: {
          type: 'object',
          additionalProperties: false,
          properties: {
            approved: { type: 'boolean', const: true, required: true },
          },
        },
        render: () => [{ type: 'text', text: 'Plan approved — plan mode exited; carry out the plan starting with your next step.' }],
      },
      execute: async (args, exec) => {
        const agent = exec.agent
        if (agent === undefined) throw new Error(`${EXIT_PLAN_MODE} requires a calling agent (no session to switch)`)
        if (!foldPlanMode(agent.session.events)) {
          throw new Error(`${EXIT_PLAN_MODE} is only available in plan mode`)
        }
        if (!/^#\s+\S/.test(args.plan.trim())) {
          throw new Error(`${EXIT_PLAN_MODE} requires a non-empty markdown plan starting with a # heading`)
        }
        const interaction = ctx.get('userQuestions')
        if (interaction === undefined) {
          throw new Error('no user-questions channel is available to review the plan; ask the user to switch the session mode instead')
        }
        const answer = await interaction.ask({
          questions: [{
            id: REVIEW_ID,
            header: 'Plan review',
            question: 'Approve this plan and leave plan mode?',
            detail: args.plan,
            options: [
              { label: APPROVE_LABEL, description: 'Leave plan mode; the plan is carried out from the next step.' },

View on GitHub (pinned to b150a551b8)

Solutions

1. Call exit_plan_mode from an agent running in a session.

When it happens

Trigger: Thrown at packages/plan/plan-mode/src/index.ts:360 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/16e4f789275976f5. Report an issue: GitHub.