> For the complete documentation index, see [llms.txt](https://docs.altlayer.io/altlayer-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.altlayer.io/altlayer-documentation/wizard/custom-avs-specification/constructor-specification-requirements.md).

# Constructor specification requirements

To use WIZARD to deploy your custom contract code, the following convention must be met for WIZARD to support it.

## ECDSA based AVS

The `ECDSAServiceManagerBase` constructor is responsible for initializing key contract addresses and disabling initializers. The mandatory arguments are:

* **AVS Directory (`_avsDirectory`)**: Manages AVS-related data for registered operators.
* **Stake Registry (`_stakeRegistry`)**: Records registration and staking details.
* **Rewards Coordinator (`_rewardsCoordinator`)**: Handles reward distributions.
* **Delegation Manager (`_delegationManager`)**: Manages staker delegations to operators.

The code snippet below shows how these parameters are set:

[`eigenlayer-middleware/src/unaudited/ECDSAServiceManagerBase.sol`](https://github.com/Layr-Labs/eigenlayer-middleware/blob/74438b7915c35ca5a0d312654716160c2499169d/src/unaudited/ECDSAServiceManagerBase.sol)

```solidity
constructor(
    address _avsDirectory,
    address _stakeRegistry,
    address _rewardsCoordinator,
    address _delegationManager
) {
    avsDirectory = _avsDirectory;
    stakeRegistry = _stakeRegistry;
    rewardsCoordinator = _rewardsCoordinator;
    delegationManager = _delegationManager;
    _disableInitializers();
}
```

## BLS based AVS

The `ServiceManagerBase` constructor sets various immutable addresses.  The mandatory arguments are:

* **AVS Directory (`__avsDirectory`)**
* **Rewards Coordinator (`__rewardsCoordinator`)**
* **Registry Coordinator (`__registryCoordinator`)**
* **Stake Registry (`__stakeRegistry`)**

The constructor calls the base storage initializer and then disables further initializers.

[`eigenlayer-middleware/src/ServiceManagerBase.sol`](https://github.com/Layr-Labs/eigenlayer-middleware/blob/74438b7915c35ca5a0d312654716160c2499169d/src/ServiceManagerBase.sol)

```solidity
constructor(
    IAVSDirectory __avsDirectory,
    IRewardsCoordinator __rewardsCoordinator,
    IRegistryCoordinator __registryCoordinator,
    IStakeRegistry __stakeRegistry
)
    ServiceManagerBaseStorage(
        __avsDirectory,
        __rewardsCoordinator,
        __registryCoordinator,
        __stakeRegistry
    )
{
    _disableInitializers();
}
```


---

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