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Spectrum
Spectrum is Photon's unified messaging SDK. Write handler logic against one app.messages stream and deliver it through iMessage, WhatsApp Business, Terminal, or a custom provider. This skill targets [`spectrum-ts`](https://github.com/photon-hq/spectrum-ts) 12.2.0; its code samples are TypeScript.
Contract gate
Identify the provider and load its topic file before writing provider-specific code. A sample is complete only when every import, method, content shape, platform ID, fallback, and thrown error belongs to spectrum-ts 12.2.0 and the selected provider contract. The universal method existing does not prove that every provider implements it; read `capability-semantics.md` whenever support affects correctness.
How this skill is organized
Each topic lives in its own file in this directory. Read the file relevant to the user's question.
| File | When to consult |
|---|---|
| `getting-started.md` | Installation, the Spectrum() app instance, multi-platform setup, the four core primitives. |
| `messages.md` | Receiving messages, the Message shape, narrowing on content.type, filtering own messages. |
| `content.md` | Content builders for outgoing messages: text, markdown, attachment, voice, contact, richlink, app, poll, group, custom. |
| `spaces-and-users.md` | The Space interface, typing indicators, responding, creating DMs and groups. |
| `reactions-and-replies.md` | message.react(...), threaded message.reply(...), when to use which. |
| `capability-semantics.md` | Native support vs fallback, warn-and-skip, accepted no-op, and thrown errors. |
| `platform-narrowing.md` | Recovering platform-specific types from generic Spectrum primitives. |
| `providers/imessage.md` | iMessage — separate cloud/local providers, shared/dedicated cloud line model, per-phone routing, message effects, tapbacks. |
| `providers/terminal.md` | Terminal TUI provider — chat sidebar, reactions, replies, attachments, slash commands. |
| `providers/whatsapp-business.md` | WhatsApp Business Cloud API. 1:1 only. |
| `custom-events-and-lifecycle.md` | Per-provider event streams (app.typing, etc.), app.stop(), signal handling. |
| `custom-platforms.md` | Authoring your own provider with definePlatform — full field reference. |
| `best-practices.md` | Production architecture patterns Photon uses internally — debounce pipeline, in-flight cancellation, carry-forward, idempotent retries, per-resource memory, job-failure audit log. |