Subagent pipeline demo in Claude Code

Holy sh*t. Someone just linked Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5 into a unified subagent pipeline inside Claude Code: it is now a fully autonomous fullstack engineering and interface architecture suite Put the frontier reasoning model in charge as system architect, offload core application logic and state management to Sonnet, and delegate asset compiling, test execution, and reactive motion design to a lightweight subagent: claude --model opus --subagents sonnet,haiku Building an enterprise-grade fullstack application on pure Opus 5.5 in a single terminal is guaranteed context suicide: designing database schemas, architecting design system primitives, tuning micro-interaction motion design, and debugging TypeScript types burns 60K tokens before the dev server even spins up, completely locking your primary terminal The tri-model hierarchy fixes this completely: Opus 5.5 leads the main session on high effort: architects service topologies, structures domain schemas, and validates end-to-end system cohesion Sonnet 5.5 writes the production code: builds backend routes, stitches React components, configures global state stores, and solves complex business logic without syntax hallucinations Haiku 5.5 works on the fly at 340 tok/s: fetches dependencies, prepares UI assets, compiles motion design transition curves for fluid 60 FPS interfaces, and runs test suites without burning reasoning context The hidden default behavior you need to fix right now: Claude Code's built-in Explore subagent secretly inherits your main session model. When Opus 5.5 sends Explore to check interface typings or inspect linter errors, Explore burns full Opus reasoning tokens on simple file greps. Swapping it with dedicated Sonnet and Haiku subagents intercepts this waste at the root. In empirical benchmarks building a complete SaaS module with database models, API handlers, and an animated dashboard, the three models compiled the production build in 1 minute 40 seconds for $0.24. Opus running alone took 5:10 and burned $1.15 from endless build log polling and test iteration loops. Opus 5.5 intervenes only at three critical architecture gates: → before schema lock: does the data layer guarantee long-term extensibility or create bottlenecks in relational joins? → during frontend review: does the component structure preserve state isolation and responsive motion design performance under load? → before production deployment: are edge-case validations resolved and do end-to-end integration tests meet business requirements? Opus 5.5 architects. Sonnet 5.5 writes logic. Haiku 5.5 handles motion design and test suites. The terminal ships the release Deterministic engineering code compiles in seconds. The frontier reasoning engine only wakes up when system architecture requires deep synthesis Architect on high. Code on medium. Zero tokens wasted on build logs - the Claude Code Fullstack topology: > Opus 5.5 on high designs domain architecture, API contracts, and validates final pull requests > Dedicated ComponentBuilder subagent on Sonnet 5.5 writes core application code, schema interfaces, and API endpoints > Dedicated MotionAndTest subagent on Haiku 5.5 configures interface motion design physics, easing curves, and runs test suites > Isolated BuildWorker compiles production bundles and checks types with zero context pollution Paste this setup into Claude Code below: "Set up my Claude Code to match this autonomous fullstack engineering runtime: 1. Check claude --version. If it's below 2.1.293, stop and tell me to run claude update, since subagent dispatch needs it 2. Create three specialized subagents in ~/.claude/agents/: > ComponentBuilder gets model: sonnet and effort: medium. Grant Read, Edit, Write, and Bash. Role: write fullstack application logic, domain schemas, API routes, and React components > MotionAndTest gets model: haiku and effort: medium. Grant Read, Edit, Write, and Bash. Role: implement interface motio…