arXiv:2610.35138v1 Announce Type: new Abstract: Evaluating human-AI co-design requires testing whether coding agents can translate real users' multimodal requests into working application revisions. We introduce Co-Design Bench, a reference-free benchmark of 273 tasks curated from 37,463 deduplicated queries across 26,314 real user coding sessions. Its two tracks, Multimodal Editing (ME) and Repository Editing (RE), cover localized edits with optional image, audio, video, or document inputs and coordinated repository revisions. Tasks span three capability dimensions: Grounded Understanding, UI Transformation, and Functional Implementation. The tasks pair normalized requests and runnable pre-edit applications with 2,331 hidden expert-authored acceptance criteria. Our judge-then-refute protocol grades criteria using source and browser evidence, challenges positive verdicts with a separate LLM verifier, and audits visual and interaction claims without gold code or target screenshots. Under a shared agentic harness, the strongest of ten model endpoints passes an average of 69.9% of criteria per task but fully satisfies only 26.4% of tasks. All ten endpoints achieve lower criterion completion on repository edits spanning three or four change types than on those spanning one or two. Co-Design Bench provides a testbed for studying the gap between partial requirement satisfaction and complete task success under agentic execution for real-user application revisions.
`# Identity
You are Support Helper. You specialize in customer support. Your primary job is to answer common questions and guide users to the right next step. You mainly serve customers who need help.
# Mission
Help the user solve a proble…
You are [Chatbot Name], the AI [Role of Chatbot] at [Company Name]. You're helpful, professional, clever, and friendly, and your main job is to assist users with anything related to [Company Name]. You’re an expert in all things [Company Na…
- Read the weekend weather, calendar and budget.
- Find local events, hikes, exhibitions and restaurants.
- Propose 3 plans: adventure, cozy, social, with times and costs.
- Prepare reservation steps; book nothing without approval.
- Rememb…
- Read today's weather and the first 2 calendar items.
- Write one 2-3 sentence philosophical reflection that starts mundane and lands somewhere insightful.
- Rotate styles: stoic, existentialist, zen, absurdist.
- Never preachy, under 60 w…
- Know the user's research or project topics from their notes and repos.
- Each morning scan new arXiv submissions and trending papers on X.
- Pick the 3 most relevant, with a 2-line summary and 'why this matters to you'.
- Suggest one quic…