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A code block whose body contains triple backticks was rendered broken in chat: the inner closing fence ended the outer block, and the rest spilled out as prose. That is correct CommonMark, so the fix is to tell every provider up front to use a longer fence in that case. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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…ence Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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When an agent replies with a code block that itself contains a fenced block (a prompt to paste, a README snippet), the chat renders it broken: the inner closing fence ends the outer block and the rest of the content spills out as plain prose. The renderer is right, that is standard CommonMark. The agent just never knew it had to use a longer fence.
This adds one sentence to the shared runtime instructions every provider adapter appends (Codex, Claude, Cursor, Grok, OpenCode, Antigravity): a code block containing triple backticks must be fenced with four backticks or
~~~. No parser change, since diverging from CommonMark would break copy/paste round-trips with GitHub and every other markdown surface.Validation:
vp test run apps/server/src/provider/RuntimeInstructions.test.tspasses (6 tests, including a new one for the guidance).Done with Claude Fable 5.1 in Claude Code.
🤖 Generated with Claude Code