multica-ai/multica · error

mcp_servers.%s must be a JSON object

Error message

mcp_servers.%s must be a JSON object

What it means

Error "mcp_servers.%s must be a JSON object" thrown in multica-ai/multica.

Source

Thrown at server/internal/daemon/execenv/cursor_mcp.go:230

	var cfg struct {
		McpServers map[string]json.RawMessage `json:"mcpServers"`
	}
	if err := json.Unmarshal(raw, &cfg); err != nil {
		return nil, fmt.Errorf("parse mcp_config json: %w", err)
	}
	if cfg.McpServers == nil {
		return map[string]json.RawMessage{}, nil
	}
	for name, server := range cfg.McpServers {
		if strings.TrimSpace(name) == "" {
			return nil, fmt.Errorf("mcp server name must not be empty")
		}
		var obj map[string]any
		if err := json.Unmarshal(server, &obj); err != nil {
			return nil, fmt.Errorf("mcp_servers.%s: %w", name, err)
		}
		if obj == nil {
			return nil, fmt.Errorf("mcp_servers.%s must be a JSON object", name)
		}
	}
	return cfg.McpServers, nil
}

func marshalCursorMcpConfig(servers map[string]json.RawMessage) ([]byte, error) {
	if servers == nil {
		servers = map[string]json.RawMessage{}
	}
	data, err := json.MarshalIndent(cursorMcpConfigFile{McpServers: servers}, "", "  ")
	if err != nil {
		return nil, fmt.Errorf("marshal cursor mcp config: %w", err)
	}
	return append(data, '\n'), nil
}

func cursorMcpApprovalKeys(projectRoot string, servers map[string]json.RawMessage) ([]string, error) {
	names := make([]string, 0, len(servers))

View on GitHub (pinned to 2c0912b6ec)

Solutions

1. Make the indicated MCP server entry a JSON object.

When it happens

Trigger: Thrown at server/internal/daemon/execenv/cursor_mcp.go:230 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of multica-ai/multica@2c0912b6ec (2026-08-15). Data as JSON: /api/errors/8857f95333b092f1. Report an issue: GitHub.