feat: added IPython autocomplete for Metaflow and MetaflowData classes

[a-coder4]

PR Type

• Bug fix
• New feature
• Core Runtime change
• Docs / tooling
• Refactoring

Summary

Adds IPython tab-completion support for the Metaflow class (Metaflow()['<TAB>'] suggests flow names) and the MetaflowData class (task.data.<TAB> suggests artifact names). This closes the remaining gaps from issue #1114 after PR #1348 added completions to MetaflowObject.

Issue

Fixes #1114

Tests

• Unit tests added/updated
• Reproduction script provided
• CI passes
• If tests are impractical: The changes are two small method additions (_ipython_key_completions_ and __dir__) that follow the exact same pattern already merged in PR feat: add ipython autocomplete support for MetaflowObject instances #1348. They can be verified interactively in a Jupyter notebook.

Non-Goals

Does not add completions for other Metaflow objects since those were already handled by PR #1348.

AI Tool Usage

• No AI tools were used in this contribution
• AI tools were used (describe below)

Claude Sonnet 4.6 was used to explore and help me understand the codebase and identify the gaps.

[greptile-apps]

Greptile Summary

This PR adds IPython tab-completion support to two classes that were missed in PR #1348: __dir__ on MetaflowData (enabling task.data.<TAB>) and _ipython_key_completions_ on Metaflow (enabling Metaflow()['<TAB>']). Both additions correctly mirror the existing pattern in MetaflowObject and interact naturally with the classes' existing __getattr__/__getitem__ implementations.

Confidence Score: 5/5

Safe to merge — two small, well-scoped additions with no logic or security concerns.

Both new methods follow an established pattern already in the codebase, have no side effects outside of IPython completion, and the only finding is a missing docstring (P2 style).

No files require special attention.

Vulnerabilities

No security concerns identified.

Important Files Changed

Filename	Overview
metaflow/client/core.py	Adds __dir__ to MetaflowData for attribute tab-completion and _ipython_key_completions_ to Metaflow for key tab-completion, both following the pattern already established in MetaflowObject.

_{Reviews (2): Last reviewed commit: "Merge branch 'master' into autocomplete-..." | Re-trigger Greptile}

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (master@c8258d1). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
metaflow/client/core.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #3071   +/-   ##
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  Coverage          ?   25.89%           
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  Files             ?      374           
  Lines             ?    51218           
  Branches          ?     9042           
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  Hits              ?    13263           
  Misses            ?    37170           
  Partials          ?      785           

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