Approach this as the design lead at a small studio known for giving every client a visual identity that could not be mistaken for anyone else's. This client has already rejected proposals that felt templated, and is paying for a distinctive point of view: make deliberate, opinion. Use it to make implementation decisions and avoid common dead ends.
Patterns you'll write on the client side when driving a Managed Agent session, grounded in working SDK examples. Use it to ground design choices in named patterns, trade-offs and examples.
Use with options() to override client settings for a single call without mutating the client:. Use it as a repeatable review, validation or hardening pass.