* [chat] add Channel abstraction as first-class citizen alongside Thread
Introduces a Channel concept — the container that holds threads — enabling
channel-level operations, thread-to-channel navigation, and natural support
for threadless platforms (iMessage, WhatsApp, SMS).
Design:
- Postable base interface: shared by both Thread and Channel, providing id,
adapter, isDM, state/setState, messages (newest-first async iterator),
post, postEphemeral, startTyping, mentionUser. Enables polymorphic code
that works with either entity.
- Channel interface (extends Postable): adds name, threads() async iterator,
and fetchInfo(). ChannelImpl provides the concrete implementation with
backward message pagination, thread listing, posting, state management
(channel-state: key prefix), and workflow serialization (chat:Channel).
- Thread updates: Thread now extends Postable and gains a `channel` getter
(lazy-created, cached ChannelImpl) and a `messages` getter (newest-first
backward iterator) alongside the existing `allMessages` (oldest-first).
- Channel ID format: derived from thread IDs by dropping the thread part.
Default: first two colon-separated parts (slack:C123, gchat:spaces/ABC).
Adapters override via optional channelIdFromThreadId() method.
- Adapter interface additions (all optional): channelIdFromThreadId,
fetchChannelMessages, listThreads, fetchChannelInfo, postChannelMessage.
- Chat class: chat.channel(channelId) method creates a Channel by ID,
auto-inferring adapter from the prefix. Reviver handles chat:Channel.
- Slack adapter: implements all five channel methods using
conversations.history (vs conversations.replies for threads),
conversations.info, and chat.postMessage without thread_ts.
- Mock adapter: updated with all channel methods for testing.
- 32 new tests covering ChannelImpl, thread.channel, deriveChannelId,
and the backward messages iterator.
Usage:
// Navigate from thread to channel
const channel = thread.channel;
// Get a channel directly
const channel = chat.channel("slack:C123ABC");
// Iterate messages newest first
for await (const msg of channel.messages) { ... }
// List threads in a channel
for await (const t of channel.threads()) { ... }
// Post to channel top-level
await channel.post("Hello channel!");
TODO:
- Add replay tests for channel operations against recorded webhook data
- Implement channel methods in non-Slack adapters (GChat, Teams, Discord,
GitHub, Linear) — currently they fall back to the default/no-op behavior
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* channel-post-sample
* Better metadata
* Fix bug
* Fixes
* Other adapters
* Fix-gchat
* Fix-discord
* Fix-discord-threads
* Discord replay
* Teams tests and fix pre-existing failures
---------
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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