listChannelMessages lists top-level channel messages. It does not expand each
message’s replies; use listChannelMessageReplies for a thread.
Example
automations/read-teams-channel.automation.ts
Inputs
Requiredteam and channel accept exact display names or IDs. Optional limit
defaults to 100 (1–10,000) and account defaults to the project binding.
Output
Returns normalized messages withmessageId, messageType, body,
importance (default normal), and default-empty attachments, mentions, and
reactions, plus available timestamps, sender identity, reply parent, subject,
summary, locale, web URL, and ETag. Body content may be text or html.