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fix(webui): add platform hint for MEDIA rendering

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WebUI sessions construct AIAgent(platform="webui") but PLATFORM_HINTS
had no "webui" entry, so the agent received no platform hint at all.
The WebUI frontend supports rich MEDIA:/absolute/path previews for
images, audio, video, PDF, HTML, CSV, diffs, and Excalidraw, but
without a hint the agent either ignores MEDIA: or falls back to
Markdown image syntax which silently fails for local files.

Add a webui hint that documents the MEDIA: render path and warns
against ![alt](/path) for local files.

Fixes #21883
This commit is contained in:
qWaitCrypto 2026-05-08 21:36:14 +08:00 • committed by kshitij
parent 7330183d08
commit aad5490e74
2 changed files with 20 additions and 0 deletions
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12
agent/prompt_builder.py
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@ -564,6 +564,18 @@ PLATFORM_HINTS = {
"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:/path instead."
),
}
# ---------------------------------------------------------------------------

8
tests/agent/test_prompt_builder.py
View file

@ -789,6 +789,7 @@ class TestPromptBuilderConstants:
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 @@ class TestPromptBuilderConstants:
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