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my guess is that "setters" was added to that sentence by mistake, since it explicitly says "for retrieving values", which differs from the CLI `config` ("for managing key-value pairs")

`Config` is implemented in each language, eg:
<https://github.com/pulumi/pulumi/tree/master/sdk/go/pulumi/config>
<https://github.com/pulumi/pulumi/blob/master/sdk/python/lib/pulumi/config.py>
<https://github.com/pulumi/pulumi/blob/master/sdk/dotnet/Pulumi/Config.cs>
etc

from a quick search/glance, none of those have "set" functions

actually, i wonder if the <https://www.pulumi.com/docs/guides/automation-api/|automation api> can be used for this? eg: <https://github.com/pulumi/automation-api-examples/blob/main/python/local_program/automation/main.py#L31>