plandex-ai/plandex · critical

all build attempts failed: %v

Error message

all build attempts failed: %v

What it means

buildRace starts multiple competing build attempts (fast-apply/validation plus whole-file fallbacks) and tolerates up to maxErrs errors. When the error channel has delivered maxErrs errors with no successful result, it concludes every attempt failed and returns this aggregate error listing all collected errors.

Source

Thrown at app/server/model/plan/build_race.go:289

	errs := []error{}
	errChNumReceived := 0

	for {
		select {
		case <-buildCtx.Done():
			log.Printf("buildRace - context canceled")
			return raceResult{}, buildCtx.Err()
		case err := <-errCh:
			errChNumReceived++
			log.Printf("buildRace - error channel received %d: %v\n", errChNumReceived, err)

			if err != nil {
				errs = append(errs, err)
			}

			if errChNumReceived >= maxErrs {
				log.Printf("buildRace - all attempts failed with %d errors", len(errs))
				return raceResult{}, fmt.Errorf("all build attempts failed: %v", errs)
			}

			if !startedFallbacks {
				log.Printf("buildRace - starting build fallbacks")
				startFallbacks("") // since replacements failed, pass an empty string for comments -- this causes whole file build to classify comments first
			}
		case res := <-resCh:
			log.Printf("buildRace - got successful result")
			return res, nil
		}
	}
}

View on GitHub (pinned to e2d772072e)

Solutions

1. Check the individual errors in the aggregate message — they usually share one root cause (auth, quota, network)
2. Verify model provider credentials, rate limits, and service status
3. Retry after the transient issue resolves; the race is designed for single-attempt flakiness, not total outage
4. Reduce input size / simplify the edit if attempts consistently fail on this file

Example fix

// before
res, err := buildRace(...)
if err != nil { return err }
// after
res, err := buildRace(...)
if err != nil {
    if strings.HasPrefix(err.Error(), "all build attempts failed") {
        return fmt.Errorf("build failed after all attempts; check provider status and retry: %w", err)
    }
    return err
}

// before starting the build, confirm the provider is reachable
if err := providerHealthCheck(ctx); err != nil {
    return fmt.Errorf("skip buildRace, provider unavailable: %w", err)
}

func isAggregateBuildFailure(err error) bool {
    return err != nil && strings.HasPrefix(err.Error(), "all build attempts failed:")
}

res, err := buildRace(...)
if isAggregateBuildFailure(err) {
    // inspect individual causes, back off, then retry once
    time.Sleep(backoff)
    res, err = buildRace(...)
}
if err != nil { return err }

When it happens

Trigger: All racing build attempts error out: the initial replacement-based build fails, started fallbacks (fast apply and whole-file build) also fail, and the errCh receives maxErrs messages before any resCh result — commonly when the LLM provider is down or every attempt produces invalid output.

Common situations: API key/quota/rate-limit problems making all model calls fail, prolonged provider outage, or systematically malformed model output for the file being edited.

Related errors

• error building whole file: %w
• fast apply validation failed: %w
• error building validate loop: %w
• validation loop failed: %s
• error building race: %v

AI-assisted analysis of plandex-ai/plandex@e2d772072e (2026-09-05). Data as JSON: /api/errors/b57c211b1840d6a0. Report an issue: GitHub.