DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.
When a user's message contains a message_link field pointing to a Slack archive URL, Claude Code now parses the channel information from the link. This enables richer context when conversations originate from Slack integrations.
Evidence
Slack link parsing (search for "message_link", regex slack\.com\/archives)
Strings lifted out of the shipped bundle, so the claim above can be checked against them.