[yunyv]

Motivation and Context

make_hashable converts sets to tuples in their iteration order. Equal sets need not have the same iteration order, so equal FunctionResultContent and ChatMessageContent instances can have different hashes. For example, results constructed from set([0, 8]) and set([8, 0]) compare equal but do not deduplicate in a set.

This also affects ChatHistoryChannel.invoke: when an agent records a message in history and returns an equal message with an equivalently valued set, the channel's mutated_history membership check can miss it and append/yield the same result twice. A regression test exercises that actual channel path using a local agent double; no model service is called.

This was found through source inspection and local reproduction, not a reported production incident. No matching open issue or competing PR was found. The contribution guide allows skipping an issue for trivial changes.

Description

• Convert sets and frozensets to frozensets of their recursively hashable elements, preserving unordered equality and set/frozenset equality.
• Keep list and tuple conversion ordered and retain existing visited-object tracking.
• Add four content hashing regressions and one real channel deduplication regression, covering different iteration orders, nested sets, set/frozenset equality and mixed element types.

Validation

Python 3.12.14, using the actual SDK and installed dependencies:

• Contents and chat-completion agent unit suites, including the five added tests: unchanged source 5 failed, 451 passed; patched source 456 passed. Both runs emitted the same 74 existing deprecation warnings.
• Ruff check and format check on all three changed files: passed.
• Focused mypy for hashing.py with the repository config and skipped imported modules: passed. This is not a whole-SDK type check.
• Syntax compilation, dependency consistency and git diff --check: passed.
• Built the sdist and wheel and verified the packaged hashing.py bytes match the tested source.

An earlier broader run had two Azure client initialization failures because the environment lacked the optional SOCKS transport dependency. Installing socksio resolved both; network or proxy settings were not changed.

The full repository suite, other Python versions and live provider/model integration tests were not run. This does not attempt to change dictionary-key handling or every possible custom-object hashing behavior.

AI assistance was used for investigation, implementation and testing. A separate automated review ran 15 additional cases: baseline 10 failed and 5 passed; patched 15 passed. No human review is claimed.

Contribution Checklist

• Python sdist and wheel build successfully.
• Relevant Ruff formatting and lint checks pass.
• Relevant unit tests pass and regression coverage was added.
• Full repository unit suite and live-provider validation (not run).

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