# Router Tolerance

### Overview

Router tolerance is a safety mechanism that allows for minor discrepancies between expected and actual returns when interacting with components. This accounts for potential rounding differences in share/asset calculations across different protocols.

### Configuration

* Set by Registry Owner via `setTolerance()` function
* Can be configured independently for each Router
* Default value is 1 (smallest possible unit)
* Should be kept minimal to ensure tight bounds on returns

### Example Usage

```solidity
// If actual shares returned are within tolerance of expected, transaction succeeds
if ((sharesReturned + tolerance) < expectedShares) {
    revert ErrorsLib.InsufficientSharesReturned();
}
```

### Governance Process

1. Registry Owner identifies need for tolerance adjustment
2. Proposes new tolerance value based on component behavior
3. Executes `setTolerance()` on target Router:

```solidity
router.setTolerance(newToleranceValue);
```

Tolerance values should be carefully considered as they represent acceptable slippage in component interactions. Higher values provide more flexibility but reduce precision of return validation.