deepseek-ai/deepseek-harness · error

fork-unavailable

fork-unavailable

Error message

session "${sessionId}" has not completed the turn containing event ${String(atSeq)}

What it means

Error "session "${sessionId}" has not completed the turn containing event ${String(atSeq)}" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/host/apiproxy/src/api-proxy.ts:2291

            code: 'internal',
            message: `fork source unavailable for session "${sessionId}": ${String(error)}`,
            details: {},
          })
        }
        const events = source.events
        // An in-log anchor belongs to the turn containing it and must never
        // clip backward to an earlier completed turn. Omitted and past-end
        // anchors retain the last-completed-turn shortcut.
        const lastSeq = events.at(-1)?.seq ?? -1
        const anchoredBoundary = atSeq === undefined
          ? undefined
          : events.find(e => e.type === 'turn/end' && e.seq >= atSeq)
        const boundary = anchoredBoundary
          ?? (atSeq === undefined || atSeq > lastSeq
            ? events.findLast(e => e.type === 'turn/end')
            : undefined)
        if (boundary === undefined) {
          return err(request, {
            code: 'fork-unavailable',
            message: atSeq !== undefined && atSeq <= lastSeq
              ? `session "${sessionId}" has not completed the turn containing event ${String(atSeq)}`
              : `session "${sessionId}" has no completed turn to fork from`,
            details: { sessionId },
          })
        }
        // Extend the cut through trailing out-of-band appends (session/title,
        // injections) up to the next turn/start: they are standalone events, so
        // the seed stays balanced, and the child inherits a title generated
        // right after the boundary turn.
        let cut = boundary.seq + 1
        while (cut < events.length && events[cut]?.type !== 'turn/start') cut++
        let workspace: Workspace | undefined
        try {
          workspace = await forkWorkspace(source)
        } catch (error: unknown) {
          return err(request, {

View on GitHub (pinned to b150a551b8)

Solutions

1. Wait until the turn containing the event completes before requesting data at that sequence.

When it happens

Trigger: Thrown at packages/host/apiproxy/src/api-proxy.ts:2291 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/753eaf3b406ee906. Report an issue: GitHub.