[Md. Shalah Uddin (shanto462)]

Motivation & Context

messages_from_responses_input gave every input_image the media type image/*, also when image_url is a data URL that declares its own type. Chat clients use that media type for base64 images: AnthropicClient sent image/*, which is not an accepted image type, and BedrockChatClient dropped the image. So images sent as data URLs to an agent behind the Responses host were rejected or lost.

Description & Review Guide

• What are the major changes? For a data:image/... URL the parser no longer passes media_type="image/*", so Content.from_uri keeps the type written in the data URL. All other URLs still get image/*. Regression tests cover the string and object forms of image_url, and check that an https URL still gets image/*.
• What is the impact of these changes? Images sent as data URLs reach the chat client with their real type (for example image/png). Nothing changes for http(s) URLs, file_id images, or data URLs that do not declare an image type.
• What do you want reviewers to focus on? The check is startswith("data:image/"), not startswith("data:") as in the chatkit converter. With data:, a data URL without a type (data:;base64,...) would get the RFC 2397 default text/plain and stop being treated as an image, so those keep image/* as before.

Related Issue

Fixes #9295

No other open PR covers this issue.

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Contribution Checklist

• The code builds clean without any errors or warnings
• All unit tests pass, and I have added new tests where possible
• The PR follows the Contribution Guidelines
• This PR links to an agreed issue with no competing open PR, or the Related Issue section documents a trivial-change or repository-automation exception.
• This is not a breaking change. If it is a breaking change, add the breaking change label (or add "[BREAKING]" to the title prefix, before or after any language prefix) — a workflow keeps the label and title prefix in sync automatically.

[Copilot]

🟢 Approval recommended

The focused implementation matches the intended behavior and includes coverage for affected and unchanged paths.

0 open findings

What changed in this PR

Fixes Responses hosting so image data URLs retain their declared media type.

Changes:

• Preserves media types such as image/png for image data URLs.
• Adds regression coverage for string, object, and HTTPS image URLs.

File	Description
python/​packages/​hosting-responses/​agent_framework_hosting_responses/​_parsing.py	Retains declared data-URL image types.
python/​packages/​hosting-responses/​tests/​hosting_responses/​test_parsing.py	Tests data and HTTPS image URL handling.

🧠 Review effort: Balanced

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