The bill titled "An Act authorizing the grant of creditable service to Thomas Brooks" seeks to grant Thomas Brooks creditable service for his tenure as a police officer with the Massachusetts Bay Transit Authority police department from May 1999 to March 2002. This credit will be used to determine his superannuation retirement allowance in accordance with existing laws. The bill overrides any conflicting general or special laws, rules, or regulations, ensuring that the retirement board of the City of Boston can proceed with this crediting.

Additionally, the bill stipulates that before Thomas Brooks can receive any retirement allowance, he must contribute to the annuity savings fund of the retirement system in a lump sum or through installments, as determined by the retirement board. This contribution will equal the amount that would have been deducted from his regular compensation during the specified period of service.