googleapis/mcp-toolbox · error

unable to create pool: %w

Error message

unable to create pool: %w

What it means

Error "unable to create pool: %w" thrown in googleapis/mcp-toolbox.

Source

Thrown at internal/sources/cloudsqlpg/cloud_sql_pg.go:72

	Project      string         `yaml:"project" validate:"required"`
	Region       string         `yaml:"region" validate:"required"`
	Instance     string         `yaml:"instance" validate:"required"`
	IPType       sources.IPType `yaml:"ipType" validate:"required"`
	Database     string         `yaml:"database" validate:"required"`
	User         string         `yaml:"user"`
	Password     string         `yaml:"password"`
	ReadOnly     bool           `yaml:"readOnly"`
	SQLCommenter *bool          `yaml:"sqlCommenter"`
}

func (r Config) SourceConfigType() string {
	return SourceType
}

func (r Config) Initialize(ctx context.Context, tracer trace.Tracer) (sources.Source, error) {
	pool, err := initCloudSQLPgConnectionPool(ctx, tracer, r.Name, r.Project, r.Region, r.Instance, r.IPType.String(), r.User, r.Password, r.Database, r.ReadOnly)
	if err != nil {
		return nil, fmt.Errorf("unable to create pool: %w", err)
	}

	err = pool.Ping(ctx)
	if err != nil {
		pool.Close()
		return nil, fmt.Errorf("unable to connect successfully: %w", err)
	}

	var res int
	err = pool.QueryRow(ctx, "SELECT 1").Scan(&res)
	if err != nil {
		pool.Close()
		return nil, fmt.Errorf("failed to execute 'SELECT 1' after connection: %w", err)
	}

	s := &Source{
		Config: r,
		Pool:   pool,

View on GitHub (pinned to 8cc6e09de2)

When it happens

Trigger: Thrown at internal/sources/cloudsqlpg/cloud_sql_pg.go:72 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/ea435fd72feb3c00. Report an issue: GitHub.