deepseek-ai/deepseek-harness · error

subagent-parent-unavailable

subagent-parent-unavailable

Error message

parent session "${parentSessionId}" is not live

What it means

Error "parent session "${parentSessionId}" is not live" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/host/apiproxy/src/api-proxy.ts:2651

        const page = historyPage(ctx, events, beforeSeq, maxMessages)
        return ok(request, { ...page, ...projections === undefined ? {} : { projections } })
      },

      async prompt(request, signal) {
        const { parentSessionId, childSessionId, content, clientTimeZone } = request.payload
        const canonicalTimeZone = clientTimeZone === undefined
          ? undefined
          : canonicalClientTimeZone(clientTimeZone)
        if (clientTimeZone !== undefined && canonicalTimeZone === undefined) {
          return err(request, {
            code: 'invalid-time-zone',
            message: 'clientTimeZone must be UTC or a valid IANA Area/Location name',
            details: { value: clientTimeZone },
          })
        }
        const parent = ctx.agents.get(parentSessionId)
        if (parent === undefined) {
          return err(request, {
            code: 'subagent-parent-unavailable',
            message: `parent session "${parentSessionId}" is not live`,
            details: { parentSessionId },
          })
        }
        const verified = await catalogChild(ctx, {
          parentSessionId, childSessionId, mode: 'continuable',
        }, signal)
        if (verified.error !== undefined) return err(request, verified.error)
        try {
          const messageId = await ctx.subagents.followup(parent, childSessionId, content, {
            source: {
              kind: 'user',
              rpcId: request.rpcId,
              ...(canonicalTimeZone === undefined ? {} : { clientTimeZone: canonicalTimeZone }),
            },
            signal,
          })

View on GitHub (pinned to b150a551b8)

Solutions

1. Resume or restart the parent session before operating on its children.

When it happens

Trigger: Thrown at packages/host/apiproxy/src/api-proxy.ts:2651 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/d7630c7c86e41758. Report an issue: GitHub.