deepseek-ai/deepseek-harness · error

${label}: ${action} in ${delayMs}ms (attempt ${failedAttempt

Error message

${label}: ${action} in ${delayMs}ms (attempt ${failedAttempts}/${policy.maxAttempts})

What it means

Error "${label}: ${action} in ${delayMs}ms (attempt ${failedAttempts}/${policy.maxAttempts})" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/mcp/mcp-client/src/connection.ts:218

    }
    // A connection that stayed up past the stability window (= maxDelayMs, the
    // longest backoff spacing) ended the previous outage: start a fresh budget.
    if (connectedAt !== undefined && Date.now() - connectedAt >= policy.maxDelayMs) failedAttempts = 0
    connectedAt = undefined
    failedAttempts += 1
    if (failedAttempts > policy.maxAttempts) {
      // Enqueue the give-up disposal so it cannot race an in-flight sync's
      // phase-2 swap (which checks isCurrent inside the queue).
      syncChain = syncChain.then(() => {
        for (const dispose of disposers.values()) dispose()
        disposers = new Map()
      })
      ctx.logger.error(`${label}: giving up after ${policy.maxAttempts} consecutive failed reconnect attempts — tools unregistered; reload the plugin or restart the Host to reconnect`)
      return
    }
    const delayMs = Math.min(policy.maxDelayMs, policy.initialDelayMs * 2 ** (failedAttempts - 1))
    const action = lostEstablishedConnection ? 'connection lost; reconnecting' : 'connection failed; retrying'
    ctx.logger.warn(`${label}: ${action} in ${delayMs}ms (attempt ${failedAttempts}/${policy.maxAttempts})`)
    reconnectTimer = setTimeout(() => {
      reconnectTimer = undefined
      settling = connectGeneration(false)
    }, delayMs)
    // An armed reconnect timer must never hold the process open on its own.
    reconnectTimer.unref()
  }

  /**
   * One connection attempt: fresh transport + client (the MCP SDK binds a
   * Protocol to one transport for life), connect, then queue the initial tool
   * sync. The startup flag belongs to the attempt rather than the shared sync
   * queue, so an early notification cannot consume strict startup semantics.
   * Every failure funnels through {@link generationDown}; success arms the
   * onclose-driven disconnect path. Never rejects.
   *
   * @param startup - Whether this is the plugin's activation attempt.
   */

View on GitHub (pinned to b150a551b8)

Solutions

1. Check the MCP server process and network; the client retries automatically, so restart the server if retries exhaust.

When it happens

Trigger: Thrown at packages/mcp/mcp-client/src/connection.ts:218 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/4b5c92908001388e. Report an issue: GitHub.