Stream Swift - docs orchestrator for iOS

This skill is small on purpose. It does not bundle SDK reference dumps - the official iOS docs are the source of truth and they cover the entire surface (Chat, Video, Feeds; SwiftUI and UIKit; polls, drafts, voice, AI, push, screen share, CallKit, SIP, transcriptions, moderation, and more).

Your job is to orchestrate: classify the request, point to the exact docs page, fetch it live, and apply it inside the user's project - while obeying the curated rules and pitfalls that the docs do not shout about.

Rules (read once per session): RULES.md - non-negotiable rules + iOS pitfalls. Read before writing any code.

The docs convention (the core mechanism)

Every Stream docs page has a Markdown twin that coding agents can read directly: take the page URL, drop the trailing /, add .md.

https://getstream.io/chat/docs/sdk/ios/basics/integration/   ->   https://getstream.io/chat/docs/sdk/ios/basics/integration.md

Always fetch the .md variant - it is clean Markdown with verbatim code, no page chrome.

Per-product index pages list every doc page with its .md URL. Fetch these to discover or confirm a page:

URL grounding: only fetch a page URL that you got from docs-map.md or from a live index fetch in this conversation. Do not invent doc paths from memory - many look guessable but are wrong. If a page is not in the map, fetch the live index and pick from it.

Step 0: Classify the request (always first)

From the user's words alone, resolve three things:

1. Product - Chat, Video, Feeds, or a combination.
2. Framework - SwiftUI, UIKit, or mixed (default to SwiftUI when the user is starting fresh and has not said).
3. Mode - one of:
   • How-to / reference ("how do I add reactions?", "what does CallViewModel do?", "theming") -> go straight to Docs lookup. No setup, no credentials.
   • Integrate ("add Chat to my app", "wire Video into this project") -> run Setup (setup.md) then Docs lookup for the feature.
   • New app ("build a livestream app", "new SwiftUI chat app") -> Setup then Docs lookup, scoped to the requested screens.
   • Migrate from Sendbird ("migrate my app from Sendbird to Stream", "replace the Sendbird Chat SDK with Stream", "we're switching off Sendbird / SendbirdUIKit / SendbirdSwiftUI") -> run sendbird-migration.md: detect the existing Sendbird integration shape, swap packages + init, re-implement each touchpoint against Stream while changing as little app code as possible, then re-apply theming and verify design + functional fidelity per screen against the Sendbird original. It reuses Setup's CLI credential flow (setup.md) and the region-by-region rigor of design-matching.md. The runbook covers the code/SDK migration; when it's done and verified, it asks whether to also migrate the Sendbird data (users, channels, message history, reactions) and, if so, hands off to the shared language-agnostic data-migration runbook ../stream/sendbird-data-migration.md (§10).
   • Push setup ("add push notifications for chat", "ringing should wake the app on a call", VoIP, CallKit) -> run push.md: create the Stream push provider(s) via the CLI and wire the client capabilities + code. Uses the Stream CLI like Setup.

There is also a styling-depth flag, orthogonal to the mode above: if the request carries a target appearance - an attached screenshot, a Figma link, or "make it look like WhatsApp / iMessage / Telegram / Slack / " - then before Docs lookup, reproduce it region by region. For Chat, first run the strategy decision below (components vs custom): if it lands on components, run design-matching.md; if it lands on custom (livestream/overlay/bespoke), run custom-ui.md instead - same region-by-region rigor, different mechanism. The rest of this paragraph is the components case (the common one). A reference design is a checklist of regions (header, composer buttons, where the timestamp + read receipts sit, bubble shape/tail, date separators, attachments...), and most of them differ from Stream's defaults structurally, not just by color. Do not stop at the wallpaper and bubble color - that is the known failure mode. Decompose every region first (capturing its dimensions, not just colors), then route each to one of three axes - theming token (Appearance), Styles modifier (factory.styles, for padding/insets/corner-radius/chrome), or ViewFactory slot (structure). Routing padding to theming, or structure to a color, is the core failure. Recurring traps the doc guards against: (1) overriding a composite slot (makeMessageItemView, the header, the composer, makeComposerInputTrailingView) silently drops the sub-features the default rendered - the incoming-message avatar, grouping, reactions, replies, status, or the send/voice/edit/slow-mode button - unless you read the default's body and reproduce them; (2) the channel header modifier is applied to a divider above the composer, so a header rendered there via safeAreaInset/VStack lands at the bottom - use .toolbar placements instead, and never fake the header in the app root for one channel; (3) the composer send/voice button lives inside the field (makeComposerInputTrailingView), so moving buttons to the right of the field needs a relayout, not just makeTrailingComposerView; (4) bubble/collage padding is Styles (makeMessageAttachmentsViewModifier), not theming. The match is not done until you build, run, seed data that triggers every region, compare region-by-region against the reference on the real navigation path, and iterate (design-matching.md Step 5), reverting any throwaway verification scaffold - the UI must be as close to the reference as possible, not approximately like it. Implement every region, the composer included - never deliver a partial match with the rest labelled "known cosmetic gaps"; a region left at the SDK default is a FAIL, not a footnote. And work in batches to stay fast: ground the pinned SDK version + checkout once, read all the source you need in one pass, implement all regions, then build once on a persistent -derivedDataPath against one pinned simulator - don't rebuild-and-screenshot after every small edit (see design-matching.md "Work in batches").

If product and framework are explicit, do not probe - proceed. If genuinely ambiguous between "wire it in" and "just explain", ask one short question:

Want me to wire this into the project, or just map the docs page and pattern?

Chat only: pick the UI strategy first (before any code)

Stream Chat ships two layers, and choosing between them is an architecture decision that dwarfs any styling choice - getting it wrong wastes a day either way. So decide deliberately, and default to the pre-built components:

Lean hard toward components. They're built to be customized, and the litmus test is: if theming + a few ViewFactory slots + Styles could get there, it's a components job - even strong reskins like WhatsApp. Pick custom only when matching the design would mean replacing the message row, composer, header, AND list all at once - i.e. you'd be using the SDK purely as a data source, not for any of its views. Over-choosing custom (rebuilding a worse messenger by hand, losing avatars/grouping/reactions/threads/attachments/typing/receipts/pickers) is the common, expensive mistake; over-choosing components costs a few hours of fighting layout. When unsure, build the components version first - it's faster to confirm-or-reject. The full signal rubric + litmus test is in custom-ui.md Step 0.

Workplace / Slack-style hybrid is a components job too - and usually a Liquid Glass one. A Slack/Teams/Discord surface is a channel list + message list + composer, so it stays on the pre-built components - but two things differ from a messenger and must be matched, not punted: (1) the message row is flat and left-aligned (avatar-top rounded-square, an author·custom-status·timestamp header line, body, bottom reaction pills, and a thread-reply summary), with no incoming/outgoing bubble split - reproduce it by overriding makeMessageItemView (composite slot - reproduce its sub-features); (2) the header and chrome are custom and typically glassy - recommend the SDK's ready-made Liquid Glass look (factory.styles = LiquidGlassStyles(), the Styles-axis baseline for translucent/floating-composer designs; renders on iOS 26+/Swift 6.2+). Workplace apps are also thread-first, so wire the thread-reply slots and thread list. Full archetype + the Liquid Glass mechanism are in design-matching.md.

The strategy also picks the channel type and permission model (e.g. messaging membership-gated for social/marketplace vs livestream public + anonymous viewers) - see RULES.md "Permissions". Decide both axes together.

If it's genuinely unclear, ask one question:

Does this chat look like a standard messenger (channel list + bubbles), or a bespoke surface like livestream/overlay chat? It decides whether we customize the pre-built components or build custom UI on the low-level client.

Step 1: Docs lookup (every request ends here)

1. Open docs-map.md. Find the row matching product + framework + feature -> it gives the exact .md URL(s).
2. If the feature is not in the map, fetch the live index for the product (table above) and pick the best-matching page.
3. Fetch the .md page(s) with WebFetch. Fetch at most 3 pages per request; if more are needed, hand the user the index URL.
4. Apply the page's guidance to the user's project: use its code verbatim where possible, adapt only to fit the existing app shape (lifecycle, navigation, package manager).
5. Cite the page you used: Source: [Title](https://getstream.io/...). Never answer SDK specifics from training data - if you did not fetch it this conversation, fetch it now or say you could not find it.
6. If the docs do not fully cover it - a specific UI customization, an exact ViewFactory signature, an undocumented option, real wiring - escalate to the SDK source code + example apps (see "When the docs fall short" in docs-map.md). The source is the final source of truth; read the version the project actually pins, and say where you found it rather than presenting it as documented. For matching a reference design, this escalation is the norm, not the exception: most of the ~100 ViewFactory slots are undocumented, so read ViewFactory.swift (every slot) + DefaultViewFactory.swift (what each renders) + the relevant Options/*.swift - design-matching.md routes each region to its slot and shows the grep commands. When you override a composite slot, also read the default view it returns (e.g. MessageContainerView for makeMessageItemView) and enumerate every sub-feature it renders, so you reproduce them instead of silently dropping them.
7. Apply best practices. Use the API mindfully - no queryChannels spam, no rendering loops, authenticate once - per RULES.md "Mindful API usage", and read the vertical's best-practices page (e.g. livestream) before scaling.

Setup (integrate / new app only)

When the mode is integrate or new app, run setup.md once per session before feature work. It covers, in order:

1. Project signals - detect Xcode project / Swift package / Podfile / empty dir.
2. Credentials - API key + user token via the Stream CLI (or user-pasted), optional seed channels.
3. Install - add the right Stream packages with the project's existing package manager.
4. Wire the client - initialize once at app launch, connect the user.

Then return here for Docs lookup on the specific screens.

If there is no iOS project at all, do not scaffold one from the CLI - tell the user to create the app in Xcode first, then continue.

What this skill no longer carries

There are no references/*.md blueprint files. Anything that used to live there now comes from the live docs via the map. This keeps the skill current automatically and covers far more than the old bundled set. The only curated, non-doc content is RULES.md (rules + pitfalls), setup.md (the CLI-driven setup flow), push.md (the CLI + code runbook for push / VoIP / CallKit, which automates what the docs only describe), design-matching.md (the procedure + region->ViewFactory-slot map for reproducing a reference design with the pre-built components), custom-ui.md (the procedure for the custom low-level path - the components-vs-custom decision, and how to build a livestream/bespoke surface on the StreamChat client + State Layer), and sendbird-migration.md (the repeatable Sendbird -> Stream Chat migration procedure - detect the integration shape, swap packages/init/views/channels/messages, and match the source app's design per screen). The middle two cover both Chat UI strategies; the decision in SKILL.md routes between them.