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When a multi-line paste looks like code, a chip above the composer asks "That looks like code. Format it as a code block (js)?" with Format as code / No thanks. It never converts on its own; typing, No, or 8 s dismiss it, and Settings → Editor → "Offer to Format Pasted Code" turns it off. - utils/looksLikeCode.ts (pure, tested): ≥ 3 lines and ≥ 2 of indentation with depth changes, statement terminators, operators + brackets, keywords, monospace/<pre> clipboard HTML, or SQL clause lines. Prose guards: quoted replies, URL lists, long sentence-punctuated lines, plain-word lines, markdown lists. Language guess only when fairly sure (js/ts/python/sql/ rust/c/php). - Accept rebuilds the pasted paragraphs as one code block from their plain text (code lines hold text only) and leaves the caret after it. - Code blocks carry an optional lang → <code class="language-js"> (whitelisted identifier only). Verified in Chromium: pasting a JS function shows the chip; Format as code → sent formatted_body is <pre><code class="language-js"> with indentation intact; a three-line prose paste shows no chip; typing after a paste dismisses it. Unit tests: 14 detector fixtures + 2 output tests; chromium e2e 19 passed. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA