> For a complete page index, fetch https://docs.synthflow.ai/llms.txt. For full documentation content, fetch https://docs.synthflow.ai/llms-full.txt.

## Choose how action input variables are mapped

![Action input variable mapping choices](https://storage.googleapis.com/granular-changelog/doc-images/actions_mapping_choice.png)

When an action needs an input variable, you can now choose how Synthflow should fill the value: collect it from the caller, use an action output, use a system variable, use a pre-call variable, or enter a fixed value.

[Action placeholders and mapping](/variables#action-placeholders-and-mapping) explains how input variables work across actions.

## Call history now preserves deleted actions

![Deleted action shown in call history](https://storage.googleapis.com/granular-changelog/doc-images/actions_tombstone.png)

If an action used during a call is deleted later, the call details will now show a deleted-action placeholder instead of removing it entirely.