# Condition Reference

Use this section when you need precise behavior for built-in Conditions used by Guards, If Groups, BTCondition nodes, Wait-style checks, and instruction-level checks.

Conditions answer pass/fail questions. Use them when a graph decision should depend on current data, nested logic, or a waiting condition. If the behavior should perform work rather than answer a question, use an Instruction or Node instead.

## Start With

| If you want to...                            | Read                                                                                                                     |
| -------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------ |
| Combine conditions into nested boolean logic | [Logic And / Logic Or](https://github.com/HaikunHuang/FlowCore/blob/main/reference/conditions/condition-logic-groups.md) |
| Gate a condition list on a named signal      | [Signal Condition](https://github.com/HaikunHuang/FlowCore/blob/main/reference/conditions/condition-signal.md)           |

## Pages

* [Logic And / Logic Or](https://github.com/HaikunHuang/FlowCore/blob/main/reference/conditions/condition-logic-groups.md): Build nested condition groups while keeping outer Guards or If Groups readable.
* [Signal Condition](https://github.com/HaikunHuang/FlowCore/blob/main/reference/conditions/condition-signal.md): Wait for a matching signal and return true only when the signal arrives before timeout.

## Related

* [Built-in Catalog Overview](/flow-core-docs/documentation/reference/built-in-catalog-overview.md)
* [Flow Node Kinds](/flow-core-docs/documentation/reference/flow-node-kinds.md)
* [Invoke and Reject Modes](/flow-core-docs/documentation/reference/invoke-and-reject-modes.md)


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