[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"branding":3,"analytics":7,"article-new-method-optimizes-ai-agent-prompts-under-constraints":10,"sections":34},{"siteName":4,"siteTagline":5,"publisherName":4,"contactEmail":6},"The Revision","Tech news, decoded.","editor@therevision.news",{"gaMeasurementId":8,"adsenseClientId":9},"G-ZW2MV82GYR","ca-pub-8533917693782264",{"article":11},{"id":12,"slug":13,"title":14,"dek":15,"body_md":16,"tags_json":17,"published_at":18,"created_at":19,"updated_at":20,"status":21,"review_note":22,"review_notes":23,"image_url":22,"persona_id":22,"persona_name":22,"section":24,"tags":25,"sources":29,"feedback":33,"feedback_at":22,"cost_usd":33,"total_tokens":33},5422,"new-method-optimizes-ai-agent-prompts-under-constraints","New method optimizes AI agent prompts under constraints","A new primal-dual technique called CAPO tunes AI agent system prompts to meet hard operational limits like formatting and safety rules, not just accuracy.","A new prompt-optimization method treats things like tool-use rules and safety formatting as hard constraints, not optional extras.\n\nResearchers introduce CAPO (Constraint-Aware Prompt Optimization), a primal-dual method that rewrites system prompts for LLM agents from a pool of candidates while adjusting constraint weights based on which requirements get violated. Tested on agentic benchmarks, it more reliably reaches prompts that satisfy explicit operational limits, such as tool-use and formatting rules, while also improving task performance. The same approach works on assistant-style tasks with formatting, safety, and privacy constraints too. The team also built DCAPO, a variant that trains a separate rewriter model with pool-based reinforcement learning to generate prompts conditioned on feedback, while leaving the underlying task-performing model untouched. Across agents of different sizes, DCAPO produced a feasible prompt in every domain tested and matched or beat baseline accuracy.\n\nMost prompt tuning today is manual trial and error chasing a single accuracy number, with constraints like token budgets and safety rules bolted on afterward through more manual iteration. CAPO folds those requirements directly into the optimization objective, which is the difference between a prompt that scores well on a benchmark and one that survives an actual compliance or safety review.\n\nIt is still an arXiv preprint, not a shipped tool, so the open question is whether this primal-dual machinery holds up on the messier, less curated prompts that real production teams actually write.","[\"prompt engineering\",\"ai agents\",\"llm research\"]","2026-08-18T04:00:00.000Z","2026-08-18T19:34:20.547Z","2026-08-18T19:34:32.421Z","published",null,[],"ai",[26,27,28],"prompt engineering","ai agents","llm research",[30],{"name":31,"url":32},"arXiv cs.AI","https:\u002F\u002Farxiv.org\u002Fabs\u002F2608.16068",0,{"sections":35},[36,40,44,49,54,59,64,69,74,78,83,88,93,98],{"name":37,"slug":24,"count":38,"latest_published_at":39},"AI",3293,"2026-08-20T04:00:00.000Z",{"name":41,"slug":42,"count":43,"latest_published_at":39},"Security","security",435,{"name":45,"slug":46,"count":47,"latest_published_at":48},"Policy","policy",210,"2026-08-19T09:32:27.000Z",{"name":50,"slug":51,"count":52,"latest_published_at":53},"Deals","deals",179,"2026-06-29T20:02:07.000Z",{"name":55,"slug":56,"count":57,"latest_published_at":58},"Hardware","hardware",140,"2026-08-19T18:25:42.000Z",{"name":60,"slug":61,"count":62,"latest_published_at":63},"Consumer Tech","consumer-tech",95,"2026-08-18T16:05:00.000Z",{"name":65,"slug":66,"count":67,"latest_published_at":68},"Science","science",90,"2026-08-19T18:41:02.000Z",{"name":70,"slug":71,"count":72,"latest_published_at":73},"Software","software",73,"2026-08-18T07:51:50.000Z",{"name":75,"slug":76,"count":77,"latest_published_at":18},"Dev Tools","dev-tools",69,{"name":79,"slug":80,"count":81,"latest_published_at":82},"Startups","startups",47,"2026-08-19T19:13:46.000Z",{"name":84,"slug":85,"count":86,"latest_published_at":87},"Gaming","gaming",41,"2026-07-09T04:00:00.000Z",{"name":89,"slug":90,"count":91,"latest_published_at":92},"General","general",33,"2026-08-18T22:18:13.000Z",{"name":94,"slug":95,"count":96,"latest_published_at":97},"Reviews","reviews",20,"2026-06-24T12:00:01.000Z",{"name":99,"slug":100,"count":101,"latest_published_at":102},"How-To","how-to",6,"2026-06-16T09:00:00.000Z"]