googleapis/mcp-toolbox · error

unable to initialize source %q: %w

Error message

unable to initialize source %q: %w

What it means

Error "unable to initialize source %q: %w" thrown in googleapis/mcp-toolbox.

Source

Thrown at internal/server/server.go:118

	l, err := util.LoggerFromContext(ctx)
	if err != nil {
		return nil, nil, nil, nil, nil, nil, fmt.Errorf("failed to get logger from context: %w", err)
	}

	// initialize and validate the sources from configs
	sourcesMap := make(map[string]sources.Source)
	for name, sc := range cfg.SourceConfigs {
		s, err := func() (sources.Source, error) {
			childCtx, span := instrumentation.Tracer.Start(
				ctx,
				"toolbox/server/source/init",
				trace.WithAttributes(attribute.String("source_type", sc.SourceConfigType())),
				trace.WithAttributes(attribute.String("source_name", name)),
			)
			defer span.End()
			s, err := sc.Initialize(childCtx, instrumentation.Tracer)
			if err != nil {
				return nil, fmt.Errorf("unable to initialize source %q: %w", name, err)
			}
			return s, nil
		}()
		if err != nil {
			return nil, nil, nil, nil, nil, nil, err
		}
		sourcesMap[name] = s
	}
	sourceNames := make([]string, 0, len(sourcesMap))
	for name := range sourcesMap {
		sourceNames = append(sourceNames, name)
	}
	l.InfoContext(ctx, fmt.Sprintf("Initialized %d sources: %s", len(sourcesMap), strings.Join(sourceNames, ", ")))

	// initialize and validate the auth services from configs
	authServicesMap := make(map[string]auth.AuthService)
	for name, sc := range cfg.AuthServiceConfigs {
		a, err := func() (auth.AuthService, error) {

View on GitHub (pinned to 8cc6e09de2)

When it happens

Trigger: Thrown at internal/server/server.go:118 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of googleapis/mcp-toolbox@8cc6e09de2 (2026-09-05). Data as JSON: /api/errors/a737abf1f07c062a. Report an issue: GitHub.