[Jeevan Babu Gotru (jeevan1098)]

Purpose

Fixes #14788

The Python OpenAPI plugin built query strings with urlencode(segments) and passed argument values through unchanged. Without doseq=True, urlencode calls str() on each value, so an array query parameter was sent as the Python list repr (tags=%5B%27red%27%2C+%27blue%27%5D) and a boolean as active=True — neither is parseable by the API. OpenAPI's default for query parameters is style: form, explode: true, i.e. ?tags=red&tags=blue&active=true, which is also how the .NET plugin serializes arrays.

Description

• RestApiOperation.build_query_string now encodes with doseq=True, so list/tuple values become repeated keys.
• A new _serialize_parameter_value helper serializes booleans with the JSON spelling (true/false); it is applied to query values (including items inside arrays), and to path and header parameters, which had the same str(argument) boolean problem.
• style/explode from the spec are still not parsed (as noted on the issue); this implements the OpenAPI default only.

Reproduced with the issue's offline repro (httpx MockTransport) on main at 25bd1bb: before the fix the captured URL was https://93.184.216.34/items?tags=%5B%27red%27%2C+%27blue%27%5D&active=True; after the fix it is https://93.184.216.34/items?tags=red&tags=blue&active=true.

Regression tests

Four new tests in test_sk_openapi.py: array + boolean query parameters, false + boolean-array query parameters, a boolean path parameter, and a boolean header parameter. All four fail without the source fix. The mapped test file passes (83 tests); the full tests/unit/connectors/openapi_plugin/ suite shows only the pre-existing DNS-pinning failures, which are identical on clean main in this sandbox. Ruff check and format are clean on both changed files.

This change was prepared with AI assistance; all steps above were run and verified by the contributor.

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There are no active review issues for the query-array and boolean serialization changes.

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What changed in this PR

Fixes #14788 by updating the Python OpenAPI plugin to serialize array query parameters and booleans in wire-compatible formats rather than Python representations.

Changes:

• Encodes query arrays as repeated keys using doseq=True.
• Serializes booleans as lowercase true/false in query, path, and header parameters.
• Adds four regression tests. Parsing explicit OpenAPI style/explode settings remains out of scope.

File	Description
python/​tests/​unit/​connectors/​openapi_plugin/​test_sk_openapi.py	Adds regression coverage for query arrays and boolean query, path, and header values.
python/​semantic_kernel/​connectors/​openapi_plugin/​models/​rest_api_operation.py	Adds boolean serialization and repeated-key query array encoding.

_{Review effort: Balanced}