Hi Clafferty, Providing an MCP server was a no brainer and we have the first version available. But you're right, using "MCP as a client" is a question we have started asking ourselves too. But we haven't had the time to experiment yet, so, no definitive answer. For now, we have a type of pipe called PipeFunc which can call a python function and so possibly any kind of tool under the hood. But that is really a makeshift solution. And we are eager to get your point of view and discuss with the community to get it right.

Many companies are working on evals and we will have a strategy for integration with Pipelex. What we have already is modularity: you can test each pipe separately or test a whole workflow, that is pretty convenient. Better yet, we have the "conceptual" level of abstraction: the code is the documentation. So you don't need any additional work to explain to an eval system what we were expecting at each workflow step: it's already written into it. We even plan to have an option (typically for debug mode) that checks every input and every output complies semantically with what was intended and expected.

Thanks a lot for your feedback! It's a lot of work so greatly appreciated.