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fix(prompt): tell CLI agents not to emit MEDIA:/path tags (#13766)

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The CLI has no attachment channel — MEDIA:<path> tags are only
intercepted on messaging gateway platforms (Telegram, Discord,
Slack, WhatsApp, Signal, BlueBubbles, email, etc.). On the CLI
they render as literal text, which is confusing for users.

The CLI platform hint was the one PLATFORM_HINTS entry that said
nothing about file delivery, so models trained on the messaging
hints would default to MEDIA: tags on the CLI too. Tool schemas
(browser_tool, tts_tool, etc.) also recommend MEDIA: generically.

Extend the CLI hint to explicitly discourage MEDIA: tags and tell
the agent to reference files by plain absolute path instead.

Add a regression test asserting the CLI hint carries negative
guidance about MEDIA: while messaging hints keep positive guidance.
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Teknium 2026-04-21 19:36:05 -07:00 • committed by GitHub
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18
tests/agent/test_prompt_builder.py
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@ -789,6 +789,24 @@ class TestPromptBuilderConstants:
assert "cron" in PLATFORM_HINTS
assert "cli" in PLATFORM_HINTS
def test_cli_hint_does_not_suggest_media_tags(self):
# Regression: MEDIA:/path tags are intercepted only by messaging
# gateway platforms. On the CLI they render as literal text and
# confuse users. The CLI hint must steer the agent away from them.
cli_hint = PLATFORM_HINTS["cli"]
assert "MEDIA:" in cli_hint, (
"CLI hint should mention MEDIA: in order to tell the agent "
"NOT to use it (negative guidance)."
)
# Must contain explicit "don't" language near the MEDIA reference.
assert any(
marker in cli_hint.lower()
for marker in ("do not emit media", "not intercepted", "do not", "don't")
), "CLI hint should explicitly discourage MEDIA: tags."
# Messaging hints should still advertise MEDIA: positively (sanity
# check that this test is calibrated correctly).
assert "include MEDIA:" in PLATFORM_HINTS["telegram"]
# =========================================================================
# Environment hints