--- schema: 1 type: video title: 'Code Mode: Let the Code do the Talking - Sunil Pai, Cloudflare' description: >- Sunil Pai from Cloudflare discusses "Code Mode," an approach to interacting with AI agents where the model generates executable code (such as JavaScript) instead of relying on traditional JSON-based tool calling. This shift allows for more efficient, stateful, and complex system interactions. Speaker info: Sunil Pai created Partykit, the open source tool for real-time multi-player apps. For his day job, he builds AI Agents at Cloudflare. - https://sunilpai.dev/ - blog.cloudflare.com/author/sunil/ - linkedin.com/in/sunil-pai-a47732253/ Timestamps 0:00 Introduction and speaker background 1:16 What is "Code Mode"? 1:31 Limitations of traditional tool calling at scale 2:03 The shift to generating executable code 3:01 Scaling API usage at Cloudflare 4:05 Why code generation is more efficient 5:28 Live demonstration of the Mythical server 7:20 A new way of interacting with systems 9:09 Example: The Kenton canvas and tic-tac-toe anecdote 11:46 New software architecture: The "Harness" 13:28 Observability and security in sandboxed environments 14:15 Long-running workflows and generative UI 16:41 Future outlook: Building for the next generation of users 17:50 The resurgence of capability-based security 18:33 Conclusion and final thoughts --- Watch along with the corrected transcript, summary, timestamps and resources on this talk's official AIE page: https://ai.engineer/talks/8txf05vVVl4-code-mode-let-the-code-do-the-talking Join our upcoming AI Engineer conferences (see https://ai.engineer landing page): - AIEi Shanghai, November 5–6 — the first for meeting top Chinese labs and engineers - AIE CODE in SF, November 10–12 — the top AI Coding conference returns - AIEi Sydney, December 7–8 — the first AIEi run alongside NeurIPS 2026 in Sydney --- canonical: 'https://liquidgold.cc/watch/8txf05vVVl4' markdown: 'https://liquidgold.cc/watch/8txf05vVVl4.md' llms: 'https://liquidgold.cc/watch/8txf05vVVl4/llms.txt' parent: 'https://liquidgold.cc/channel/aidotengineer.md' channel: aidotengineer updated: '2026-10-24T15:15:31.800Z' language: null children: [] videoId: 8txf05vVVl4 durationSeconds: 1180 publishedAt: '2026-04-19T17:19:35.000Z' searchChunks: - ordinal: 0 text: null startSeconds: 88 endSeconds: 99 watch: 'https://liquidgold.cc/watch/8txf05vVVl4?t=88' heldReason: rights - ordinal: 1 text: null startSeconds: 109 endSeconds: 123 watch: 'https://liquidgold.cc/watch/8txf05vVVl4?t=109' heldReason: rights - ordinal: 2 text: null startSeconds: 123 endSeconds: 133 watch: 'https://liquidgold.cc/watch/8txf05vVVl4?t=123' heldReason: rights - ordinal: 3 text: null startSeconds: 133 endSeconds: 186 watch: 'https://liquidgold.cc/watch/8txf05vVVl4?t=133' heldReason: rights - ordinal: 4 text: null startSeconds: 198 endSeconds: 255 watch: 'https://liquidgold.cc/watch/8txf05vVVl4?t=198' heldReason: rights - ordinal: 5 text: null startSeconds: 265 endSeconds: 336 watch: 'https://liquidgold.cc/watch/8txf05vVVl4?t=265' heldReason: rights - ordinal: 6 text: null startSeconds: 457 endSeconds: 559 watch: 'https://liquidgold.cc/watch/8txf05vVVl4?t=457' heldReason: rights - ordinal: 7 text: null startSeconds: 571 endSeconds: 714 watch: 'https://liquidgold.cc/watch/8txf05vVVl4?t=571' heldReason: rights - ordinal: 8 text: null startSeconds: 571 endSeconds: 714 watch: 'https://liquidgold.cc/watch/8txf05vVVl4?t=571' heldReason: rights - ordinal: 9 text: null startSeconds: 714 endSeconds: 724 watch: 'https://liquidgold.cc/watch/8txf05vVVl4?t=714' heldReason: rights - ordinal: 10 text: null startSeconds: 724 endSeconds: 813 watch: 'https://liquidgold.cc/watch/8txf05vVVl4?t=724' heldReason: rights - ordinal: 11 text: null startSeconds: 813 endSeconds: 824 watch: 'https://liquidgold.cc/watch/8txf05vVVl4?t=813' heldReason: rights - ordinal: 12 text: null startSeconds: 859 endSeconds: 872 watch: 'https://liquidgold.cc/watch/8txf05vVVl4?t=859' heldReason: rights - ordinal: 13 text: null startSeconds: 872 endSeconds: 1001 watch: 'https://liquidgold.cc/watch/8txf05vVVl4?t=872' heldReason: rights - ordinal: 14 text: null startSeconds: 872 endSeconds: 1001 watch: 'https://liquidgold.cc/watch/8txf05vVVl4?t=872' heldReason: rights - ordinal: 15 text: null startSeconds: 1011 endSeconds: 1077 watch: 'https://liquidgold.cc/watch/8txf05vVVl4?t=1011' heldReason: rights - ordinal: 16 text: null startSeconds: 1077 endSeconds: 1087 watch: 'https://liquidgold.cc/watch/8txf05vVVl4?t=1077' heldReason: rights - ordinal: 17 text: null startSeconds: 1087 endSeconds: 1119 watch: 'https://liquidgold.cc/watch/8txf05vVVl4?t=1087' heldReason: rights --- # Code Mode: Let the Code do the Talking - Sunil Pai, Cloudflare Sunil Pai from Cloudflare discusses "Code Mode," an approach to interacting with AI agents where the model generates executable code (such as JavaScript) instead of relying on traditional JSON-based tool calling. This shift allows for more efficient, stateful, and complex system interactions. Speaker info: Sunil Pai created Partykit, the open source tool for real-time multi-player apps. For his day job, he builds AI Agents at Cloudflare. - https://sunilpai.dev/ - blog.cloudflare.com/author/sunil/ - linkedin.com/in/sunil-pai-a47732253/ Timestamps 0:00 Introduction and speaker background 1:16 What is "Code Mode"? 1:31 Limitations of traditional tool calling at scale 2:03 The shift to generating executable code 3:01 Scaling API usage at Cloudflare 4:05 Why code generation is more efficient 5:28 Live demonstration of the Mythical server 7:20 A new way of interacting with systems 9:09 Example: The Kenton canvas and tic-tac-toe anecdote 11:46 New software architecture: The "Harness" 13:28 Observability and security in sandboxed environments 14:15 Long-running workflows and generative UI 16:41 Future outlook: Building for the next generation of users 17:50 The resurgence of capability-based security 18:33 Conclusion and final thoughts --- Watch along with the corrected transcript, summary, timestamps and resources on this talk's official AIE page: https://ai.engineer/talks/8txf05vVVl4-code-mode-let-the-code-do-the-talking Join our upcoming AI Engineer conferences (see https://ai.engineer landing page): - AIEi Shanghai, November 5–6 — the first for meeting top Chinese labs and engineers - AIE CODE in SF, November 10–12 — the top AI Coding conference returns - AIEi Sydney, December 7–8 — the first AIEi run alongside NeurIPS 2026 in Sydney --- Canonical: https://liquidgold.cc/watch/8txf05vVVl4 · Channel: [AI Engineer](https://liquidgold.cc/channel/aidotengineer.md) > Search chunk text is held until public-source provenance is verified. ## Document chunks > Missing: no stored document chunks are available.