googleapis/mcp-toolbox · error

INVALID_PARAMS

INVALID_PARAMS

Error message

invalid tool name: tool with name %q does not exist

What it means

Error "invalid tool name: tool with name %q does not exist" thrown in googleapis/mcp-toolbox.

Source

Thrown at internal/server/mcp/v20251125/method.go:170

		err = fmt.Errorf("invalid mcp tools call request: %w", err)
		return jsonrpc.NewError(id, jsonrpc.INVALID_REQUEST, err.Error(), nil), err
	}

	toolName := req.Params.Name
	toolArgument := req.Params.Arguments
	logger.DebugContext(ctx, fmt.Sprintf("tool name: %s", toolName))

	// Update span name and set gen_ai attributes
	span := trace.SpanFromContext(ctx)
	span.SetName(fmt.Sprintf("%s %s", TOOLS_CALL, toolName))
	span.SetAttributes(
		attribute.String("gen_ai.tool.name", toolName),
		attribute.String("gen_ai.operation.name", "execute_tool"),
	)

	// Verify tool belongs to the current group before resolving globally.
	if !g.ContainsTool(toolName) {
		err = fmt.Errorf("invalid tool name: tool with name %q does not exist", toolName)
		return jsonrpc.NewError(id, jsonrpc.INVALID_PARAMS, err.Error(), nil), err
	}

	tool, ok := primitiveMgr.GetTool(toolName)
	if !ok {
		err = fmt.Errorf("invalid tool name: tool with name %q does not exist", toolName)
		return jsonrpc.NewError(id, jsonrpc.INVALID_PARAMS, err.Error(), nil), err
	}

	if tool.HasSecureParams() {
		err = fmt.Errorf("invalid tool name: tool with name %q does not exist", toolName)
		return jsonrpc.NewError(id, jsonrpc.INVALID_PARAMS, err.Error(), nil), err
	}

	srcName := tool.GetSourceName()
	var src sources.Source
	if srcName != "" {
		src, ok = primitiveMgr.GetSource(srcName)

View on GitHub (pinned to 8cc6e09de2)

When it happens

Trigger: Thrown at internal/server/mcp/v20251125/method.go:170 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/b25432bbf1233ab9. Report an issue: GitHub.