googleapis/mcp-toolbox · error

unable to parse prompt %q as resourceType %q: %w

Error message

unable to parse prompt %q as resourceType %q: %w

What it means

Error "unable to parse prompt %q as resourceType %q: %w" thrown in googleapis/mcp-toolbox.

Source

Thrown at internal/prompts/prompts.go:60

	return true
}

// DecodeConfig looks up the registered factory for the given type and uses it
// to decode the prompt configuration.
func DecodeConfig(ctx context.Context, resourceType, name string, decoder *yaml.Decoder) (PromptConfig, error) {
	factory, found := promptRegistry[resourceType]
	if !found && resourceType == "" {
		resourceType = "custom"
		factory, found = promptRegistry[resourceType]
	}

	if !found {
		return nil, fmt.Errorf("unknown prompt type: %q", resourceType)
	}

	promptConfig, err := factory(ctx, name, decoder)
	if err != nil {
		return nil, fmt.Errorf("unable to parse prompt %q as resourceType %q: %w", name, resourceType, err)
	}
	return promptConfig, nil
}

type PromptConfig interface {
	PromptConfigType() string
	Initialize() (Prompt, error)
}

type Prompt interface {
	GetDesc() string
	GetArguments() Arguments
	SubstituteParams(parameters.ParamValues) (any, error)
	ParseArgs(map[string]any, map[string]map[string]any) (parameters.ParamValues, error)
	Manifest() Manifest
	ToConfig() PromptConfig
}

View on GitHub (pinned to 8cc6e09de2)

When it happens

Trigger: Thrown at internal/prompts/prompts.go:60 when the library encounters an invalid state.

Common situations: See trigger scenarios.

Understand the failure class

• Parsing and encoding errors: unexpected token, malformed input — why parsers reject input and how to find the real culprit.

AI-assisted analysis of googleapis/mcp-toolbox@8cc6e09de2 (2026-09-05). Data as JSON: /api/errors/c64610456ef3fe88. Report an issue: GitHub.