# Execution contracts

See {doc}`../customization` for hook ordering, ownership, and implementation obligations.
`RunRequest` describes one command. Executor contracts let adapters use a custom backend.

```{eval-rst}
.. automodule:: contree_sdk.execution
   :members:
   :inherited-members:
   :undoc-members:
   :member-order: bysource
```

```{eval-rst}
.. automodule:: contree_sdk.session.contracts
   :members:
   :undoc-members:
   :member-order: bysource
```