ahmetb/kubectx · error

failed to check context: %w

Error message

failed to check context: %w

What it means

ContextExists failed while checking whether the old context name exists in the parsed kubeconfig. It fires when the underlying kyaml lookup over the contexts list errors (malformed YAML structure in a kubeconfig file), not when the context is merely missing. The kubeconfig was already parsed successfully; the fault is in the contexts field of one of the files.

Source

Thrown at cmd/kubectx/rename.go:65

		return err
	}
	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
	defer kc.Close()
	if err := kc.Parse(); err != nil {
		return fmt.Errorf("kubeconfig error: %w", err)
	}

	cur, err := kc.GetCurrentContext()
	if err != nil {
		return fmt.Errorf("failed to get current context: %w", err)
	}
	if op.Old == "." {
		op.Old = cur
	}

	oldExists, err := kc.ContextExists(op.Old)
	if err != nil {
		return fmt.Errorf("failed to check context: %w", err)
	}
	if !oldExists {
		return fmt.Errorf("context \"%s\" not found, can't rename it", op.Old)
	}

	newExists, err := kc.ContextExists(op.New)
	if err != nil {
		return fmt.Errorf("failed to check context: %w", err)
	}
	if newExists {
		printer.Warning(stderr, "context \"%s\" exists, overwriting it.", op.New)
		if err := kc.DeleteContextEntry(op.New); err != nil {
			return fmt.Errorf("failed to delete new context to overwrite it: %w", err)
		}
	}

	if err := kc.ModifyContextName(op.Old, op.New); err != nil {
		return fmt.Errorf("failed to change context name: %w", err)

View on GitHub (pinned to 12ad6fb22e)

Solutions

1. Inspect each KUBECONFIG file (split on ':') and validate its YAML, especially the top-level contexts list
2. Run kubectl config get-contexts to see if kubectl can read the same files and reveal the broken one
3. Fix or remove the malformed kubeconfig file and retry the rename

When it happens

Trigger: Thrown at cmd/kubectx/rename.go:65 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of ahmetb/kubectx@12ad6fb22e (2026-09-02). Data as JSON: /api/errors/85c2216cbfdf284e. Report an issue: GitHub.