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A printed Builderlab agent card's QR leads to its share page (app.builderlab.xyz/a/<id>), whose "Add to Buzz" button opens buzz://agent/new?card=<id>. Mobile now handles that link: it fetches the card's agent.json from the avatars CDN for this build's Builderlab environment and opens the Agents page with an editable, prefilled Create agent form. Opening a link never creates an agent. - shared/deeplink: strict parser for buzz://agent/new?card=<token>; any other shape is not this link. - HostedEnvironment.avatarsCdnOrigin maps each account environment to its CDN; the link can never name the host. - AgentCreationDraft.fetch reads name, avatarUrl, instructions, model and reasoningEffort. Every field is optional: published cards have only name and avatar today. snake_case and a few synonyms are also read so a later agent.json revision degrades to a partial draft instead of failing. The avatar is used only from the same CDN; the body is capped at 256 KiB. - AgentsPage waits for sign-in, the registry load and remote-agent support, drops the link with a message if a setup is unfinished or the card can't be loaded, and replaces an open Agents stack rather than stacking one. - CreateAgentPage takes an optional draft; model and effort apply only if the live catalog offers them. - Table tests for the link and agent.json, and a journey test from link to Create against a fake CDN (needs BUZZ_AUTH_DOMAINS, like the other hosted agent tests). Co-authored-by: studio <dc2fc481343672df31a689840c09299972e704dac592e0da6f18486646a7ee3e@buzz.block.builderlab.xyz> Signed-off-by: Tom Brow <tomb@squareup.com>