Search Slack messages in PUBLIC channels only.

Use this to find discussions about a Jira ticket or PR by passing the ticket key (e.g. "DSE-1234"), a PR URL, or free-text keywords as the query. Results from DMs and private channels are never returned.

Args: query: Search text — a ticket key, PR URL, or keywords. count: Max results (1-100, default 20).

Read a full thread (root message + all replies) from a PUBLIC channel.

Args: channel: Channel id (e.g. "C0123") or "#name". Must be a public channel. thread_ts: The thread's root timestamp (the ts of the first message).

Read recent messages from a PUBLIC channel, or messages around a timestamp.

Args: channel: Channel id or "#name". Must be a public channel. limit: Number of messages (1-100, default 30). around_ts: Optional message timestamp; returns messages up to and including it, for context around a specific point.

List PUBLIC channels, optionally filtered by a name substring.

Args: name_filter: Optional case-insensitive substring to match channel names.

Resolve Slack user ids (e.g. "U0123") to display names.

Args: user_ids: List of Slack user ids to resolve.

Prepare a message for sending and return a preview + confirmation token.

THIS DOES NOT SEND ANYTHING. It validates the target is a public channel, renders exactly what would be posted, and returns a one-time confirmation_token. To actually post, the user must review this preview and then call send_message(confirmation_token=...). Always show the user this preview and get their explicit approval before calling send_message.

Args: channel: Channel id or "#name". Must be a public channel. text: The exact message text to post. thread_ts: Optional thread root timestamp to reply in a thread.

Send a previously drafted message. Requires a valid confirmation_token from draft_message. This is the ONLY tool that posts to Slack.

Only call this after the user has reviewed the draft_message preview and explicitly approved sending.

Args: confirmation_token: The one-time token returned by draft_message.