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I was attempting to model this flow:
1. Task runs some external service
2. That external service returns some data
3. Another task that takes that data, adds a property 
4. Other tasks use the existence of that property in an `onlyIf` block

Have you considered a <https://docs.gradle.org/current/userguide/build_services.html|shared build service> to store the data? Tasks can talk to it to put, mutate, and query the data.

I considered going down this route but this logic would have to interact with a `Project` object which isn't configuration-cache safe AFAIK

what sort of data does the external service return? E.g. A lot of files? Or a REST response with a couple of properties?

okay, cool, and what property does the task in step 3 add? It edits the file’s text content, like find/replacing a version number, or applying a git diff - something like that?

maybe instead of an `onlyIf {}` block you want to just change the other tasks to only process files that contain the property.

```val downloaderTask by tasks.registering { ... }

val processorTask by tasks.registering { ... }

val otherTask by tasks.registering {
  val processedFilesWithProperty = processorTask.map {
      it.outputDirectory.asFileTree.files.filter { file -&gt; 
          "xyzProperty" in file.readText() 
      }
  }
  inputs.files(processedFilesWithProperty)

  doLast {
    val files = processedFilesWithProperty.get()
    // ...
  }
}```


Oh this is a good idea too - thanks, lemme run with this for a second