fix(discord): keep thread title prompts UTF-16 safe#101551
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Co-authored-by: Alix-007 <[email protected]>
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Related: #101307
What Problem This Solves
Fixes an issue where Discord users generating automatic thread titles could send malformed prompt text when a message, channel name, or channel description hit its character cap in the middle of an emoji.
Why This Change Was Made
All three bounded prompt fields now use OpenClaw's shared UTF-16-safe truncation helper. The formatter remains private, and the regression exercises the actual title-generation completion path rather than adding a test-only production export.
The original contributor branch became ancestry-corrupted and could not be rewritten through GitHub's maintainer-edit path, so this clean maintainer branch preserves the contributor's authorship via
Co-authored-by.User Impact
Discord thread-title generation keeps the same limits and ellipsis behavior while avoiding dangling UTF-16 surrogate halves in model prompts.
Evidence
generateThreadTitlewith split-surrogate boundaries in message text, channel name, and channel description, then inspects the real completion prompt.oxfmt --checkfor both touched files: passed.git diff --check: passed.