# MassTransit Coding Skills > Focused MassTransit v9 implementation guidance for coding agents. Canonical documentation and the target application's existing code take precedence over these skills. Choose the skill that matches the requested change, then verify APIs against the linked MassTransit documentation and the application's referenced package version. ## Skills - [Skills Runbook](https://masstransit.massient.com/skills/README.md): Select skills and apply shared guidance. - [Consumer Foundation](https://masstransit.massient.com/skills/consumer-foundation.md): Consumers and consumer definitions. - [Saga State Machine Foundation](https://masstransit.massient.com/skills/saga-state-machine-foundation.md): State-machine sagas, correlation, persistence, and scheduling. - [Routing Slip Activity Foundation](https://masstransit.massient.com/skills/routing-slip-activity-foundation.md): Compensating routing-slip activities. - [Request Response Foundation](https://masstransit.massient.com/skills/request-response-foundation.md): Request clients and explicit business responses. - [Test Harness Foundation](https://masstransit.massient.com/skills/test-harness-foundation.md): Consumer, saga, and request/response tests. - [Outbox Foundation](https://masstransit.massient.com/skills/outbox-foundation.md): In-memory, Consumer, and Bus Outbox configuration. - [Endpoint Configuration Foundation](https://masstransit.massient.com/skills/endpoint-configuration-foundation.md): Endpoint naming, concurrency, and middleware.