googleapis/mcp-toolbox · error

failed to execute 'SELECT 1' after connection: %w

Error message

failed to execute 'SELECT 1' after connection: %w

What it means

Error "failed to execute 'SELECT 1' after connection: %w" thrown in googleapis/mcp-toolbox.

Source

Thrown at internal/sources/cloudsqlpg/cloud_sql_pg.go:85

}

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,
	}
	return s, nil
}

var _ sources.Source = &Source{}

type Source struct {
	Config
	Pool *pgxpool.Pool
}

func (s *Source) IsReadOnly() bool {
	return s.ReadOnly

View on GitHub (pinned to 8cc6e09de2)

When it happens

Trigger: Thrown at internal/sources/cloudsqlpg/cloud_sql_pg.go:85 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/65baeb3df343c625. Report an issue: GitHub.