For AI agents: the complete documentation index is available at https://mfeflow.github.io/mfeflow/llms.txt, the full documentation bundle is available at https://mfeflow.github.io/mfeflow/llms-full.txt, and this page is available as Markdown at https://mfeflow.github.io/mfeflow/errors/E203.md.
mfeflow

    MFEFLOW_E203

    A third-party feature uses something third-party features may not.

    Fix

    Third-party features are declarative: files under src/, public/ and docs/, registry dependencies, plain script names and the built-in transform ops (not add-workflow-step). Ask the author to remove it, or do not add this feature.