The MEDIA: output token must appear at line start with no space after
the colon for OpenClaw's splitMediaFromOutput parser to extract the
file path and auto-attach media on outbound chat channels (Discord,
Telegram, WhatsApp, etc.).
The script was printing 'MEDIA: /path' (with space), which while
tolerated by the regex, does not match the canonical 'MEDIA:/path'
format used by all other skills (e.g. openai-image-gen) and tested
in the codebase (pi-embedded-subscribe.tools.media.test.ts,
media/parse.test.ts).
Also updated the comment to clarify the format constraint.