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If nothing has changed, Pulumi up should report no changes anyway, so it should be harmless to run it frequently. IOW, assuming Bazel is similar to make, Pulumi itself is keeping track of the dependencies, so you should just run it every time in most circumstances. If there's some context I'm missing, can you provide more details about the problem you might be seeing?

Bazel can perform multi language builds Pulumi is one language at a time and doesn't build applications Bazel has better docker layer management than Pulumi docker (in theory)

Have you looked at the Automation API? It might be a better fit for what you want. It would allow you to build a Pulumi program using Bazel because you embed Pulumi in a regular program and can call it without the Pulumi CLI. Some hopefully helpful links: • https://www.pulumi.com/docs/guides/automation-api/ • Python sample code: https://github.com/pulumi/automation-api-examples/blob/main/python/inline_program/main.py