Add missing webui entry to PLATFORM_HINTS

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Merged to main. A stamp counts the issues a fix is linked to.

• #22438 fix(webui): add platform hint for MEDIA rendering

  merged to main

  files: agent/prompt_builder.py, tests/agent/test_prompt_builder.py

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  • agent/prompt_builder.py

    @@ -564,6 +564,18 @@ def _strip_yaml_frontmatter(content: str) -> str:
             "code fences). Treat this like a conversation, not a document. Keep responses "
             "brief and natural."
         ),
    +    "webui": (
    +        "You are in the Hermes WebUI, a browser-based chat interface. "
    +        "Full Markdown rendering is supported — headings, bold, italic, code "
    +        "blocks, tables, math (LaTeX), and Mermaid diagrams all render natively. "
    +        "To display local or remote media/files inline, include "
    +        "MEDIA:/absolute/path/to/file or MEDIA:https://... in your response. "
    +        "Local file paths must be absolute. Images, audio (with playback speed "
    +        "controls), video, PDFs, HTML, CSV, diffs/patches, and Excalidraw files "
    +        "render as rich previews. Do not use Markdown image syntax like "
    +        "![alt](/path) for local files; local paths are not served that way. "
    +        "Use MEDIA:/absolute/path instead."
    +    ),
     }
     
     # ---------------------------------------------------------------------------

  • tests/agent/test_prompt_builder.py

    @@ -789,6 +789,7 @@ def test_platform_hints_known_platforms(self):
             assert "cron" in PLATFORM_HINTS
             assert "cli" in PLATFORM_HINTS
             assert "api_server" in PLATFORM_HINTS
    +        assert "webui" in PLATFORM_HINTS
     
         def test_cli_hint_does_not_suggest_media_tags(self):
             # Regression: MEDIA:/path tags are intercepted only by messaging
    @@ -826,6 +827,13 @@ def test_platform_hints_feishu(self):
             assert "MEDIA:" in hint
             assert "Markdown" in hint
     
    +    def test_platform_hints_webui(self):
    +        hint = PLATFORM_HINTS["webui"]
    +        assert "WebUI" in hint
    +        assert "MEDIA:" in hint
    +        assert "Markdown" in hint
    +        assert "absolute" in hint
    +
     
     # =========================================================================
     # Environment hints