poetry add pymilvus fails dependency resolution on versions before 2.4.4

TL;DR

Issue milvus-io/pymilvus#2131 (closed, 10 comments): Creating a fresh environment with poetry and running poetry add pymilvus=^2.4.3 fails during dependency resolution.

Steps

1. Issue milvus-io/pymilvus#2131 (closed, 10 comments): Creating a fresh environment with poetry and running poetry add pymilvus=^2.4.3 fails during dependency resolution. The reporter expected a clean install and instead got a resolver error that never appeared with pip, which pointed at how pymilvus declares its platform-specific dependencies.
2. Poetry's resolver choked on pymilvus's platform-conditional dependencies. Maintainer XuanYang-cn shipped the fix in pymilvus 2.4.4 (via PR #2136, which added proper Windows platform checks so the environment markers resolve cleanly under poetry). Resolution: upgrade to pymilvus 2.4.4 or newer and rerun poetry add.

When to use

Use this skill when you run into "poetry add pymilvus fails dependency resolution on versions before 2.4.4".

When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

Versions

Versions mentioned in the source: pymilvus 2.4.3, pymilvus 2.4.4. If you are on something much newer or older, the details may have shifted.

Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

In the GitHub issue gh:milvus-io/pymilvus#2131 (https://github.com/milvus-io/pymilvus/issues/2131), the problem reported was: Issue milvus-io/pymilvus#2131 (closed, 10 comments): Creating a fresh environment with poetry and running poetry add pymilvus=^2.4.3 fails during dependency resolution. The reporter expected a clean install and instead got a resolver error that never appeared with pip, which pointed at how pymilvus declares its platform-specific dependencies. The verified resolution was: Poetry's resolver choked on pymilvus's platform-conditional dependencies. Maintainer XuanYang-cn shipped the fix in pymilvus 2.4.4 (via PR #2136, which added proper Windows platform checks so the environment markers resolve cleanly under poetry). Resolution: upgrade to pymilvus 2.4.4 or newer and rerun poetry add.