[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"branding":3,"analytics":7,"article-five-patterns-that-shape-how-mcp-servers-get-built":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},2779,"five-patterns-that-shape-how-mcp-servers-get-built","Five Patterns That Shape How MCP Servers Get Built","A new paper catalogs five recurring architecture patterns and four anti-patterns across fifteen MCP servers, including a hard limit on tool counts.","Researchers have mapped the emerging architecture of the Model Context Protocol ecosystem — and found it already has recurring shapes worth naming.\n\nThe Model Context Protocol, which Anthropic shipped in November 2024, gives large language models a standardized way to connect to external tools and data sources. Within months, hundreds of community-built servers appeared on GitHub. A new industry experience paper analyzed fifteen independently developed servers — five from the ANSYR voice AI platform and ten from the official MCP registry — and identified five recurring patterns: Resource Gateway, Tool Orchestrator, Stateful Session Server, Proxy Aggregator, and Domain-Specific Adapter. The authors also documented four anti-patterns and flagged authentication, versioning, and observability as cross-cutting concerns that keep showing up regardless of which pattern a team picks.\n\nThe most concrete finding is a tool-count cliff. The study found that tool-selection accuracy for Claude Haiku 4.5 drops below 90% when a context window holds more than 10 to 15 tools; for Sonnet 4 the threshold is 20 to 30 tools. That is a practical ceiling, not a theoretical one, and it gives teams building MCP integrations a concrete reason to decompose large servers rather than piling tools into a single context. Inter-rater reliability across two independent LLM raters on 54 held-out servers came in at a Cohen's kappa of 0.76, which is solid but leaves three pattern-boundary cases the taxonomy could not cleanly resolve.\n\nMCP is less than two years old, and formalized architectural guidance usually lags ecosystems by far longer — the Gang of Four design patterns arrived years after object-oriented code was already everywhere. Getting a structured catalog this early, with a replication package attached, is useful; whether the five patterns hold as the ecosystem matures is a question the next wave of servers will answer.","[\"model-context-protocol\",\"llm-tooling\",\"architecture\",\"ai\"]","2026-06-30T04:00:00.000Z","2026-06-30T12:34:38.564Z","2026-06-30T12:34:41.531Z","published",null,[],"ai",[26,27,28,24],"model-context-protocol","llm-tooling","architecture",[30],{"name":31,"url":32},"arXiv cs.AI","https:\u002F\u002Farxiv.org\u002Fabs\u002F2606.30317",0,{"sections":35},[36,40,45,50,55,60,65,70,75,80,85,89,94,99],{"name":37,"slug":24,"count":38,"latest_published_at":39},"AI",2590,"2026-07-16T04:00:00.000Z",{"name":41,"slug":42,"count":43,"latest_published_at":44},"Security","security",294,"2026-07-15T19:59:48.000Z",{"name":46,"slug":47,"count":48,"latest_published_at":49},"Deals","deals",179,"2026-06-29T20:02:07.000Z",{"name":51,"slug":52,"count":53,"latest_published_at":54},"Policy","policy",158,"2026-07-16T00:02:48.000Z",{"name":56,"slug":57,"count":58,"latest_published_at":59},"Hardware","hardware",122,"2026-07-14T19:46:26.000Z",{"name":61,"slug":62,"count":63,"latest_published_at":64},"Consumer Tech","consumer-tech",93,"2026-07-13T13:20:48.000Z",{"name":66,"slug":67,"count":68,"latest_published_at":69},"Software","software",70,"2026-07-13T19:52:25.000Z",{"name":71,"slug":72,"count":73,"latest_published_at":74},"Science","science",66,"2026-07-10T10:29:37.000Z",{"name":76,"slug":77,"count":78,"latest_published_at":79},"Dev Tools","dev-tools",59,"2026-07-07T04:00:00.000Z",{"name":81,"slug":82,"count":83,"latest_published_at":84},"Gaming","gaming",41,"2026-07-09T04:00:00.000Z",{"name":86,"slug":87,"count":83,"latest_published_at":88},"Startups","startups","2026-06-29T20:55:50.000Z",{"name":90,"slug":91,"count":92,"latest_published_at":93},"General","general",29,"2026-07-10T22:28:58.000Z",{"name":95,"slug":96,"count":97,"latest_published_at":98},"Reviews","reviews",20,"2026-06-24T12:00:01.000Z",{"name":100,"slug":101,"count":102,"latest_published_at":103},"How-To","how-to",6,"2026-06-16T09:00:00.000Z"]