handbook/docker/packages/slack/CAPABILITIES.md

Slack Capabilities

A mock Slack workspace with channels, messages, threads, reactions, pins, user profiles, file sharing, direct messages, and presence/status. Supports an admin mode (via is_admin: true in state) where the agent can edit/delete any user's messages and manage channels.

What the agent can do

Send and manage messages. Post to channels, reply to threads, edit existing messages, delete messages. Cross-channel search by text + author with pagination (search_messages). Search supports in:, from:, after:, before:, during:, and has:link|reaction|star|pin; from:me is not supported because the mock has no caller identity.

Read conversations. Get channel message history, view full thread replies, browse messages. search_messages finds across all channels simultaneously.

Manage channels. List all channels, create public or private channels, archive, rename (with history tracking), set channel topics and purposes.

Reactions and pins. Add emoji reactions to messages, pin important messages for easy reference, unpin, list all pinned messages in a channel.

User profiles and presence. Look up profiles (name, title, email), check if a user is online or away, and set custom status text and emoji.

File sharing. Upload files to channels (with automatic MIME type detection) and list files shared in a channel. Uploaded files create a message in the channel with the file attached.

Direct messages. Open a DM with another user, list existing DM conversations, and send DMs. DMs are separate from channel messages.

Admin mode. When is_admin: true in state, the mock user is treated as a workspace admin: edit_message and delete_message can act on any user's messages (not just the bot's own), and archive_channel / rename_channel / set_channel_topic work without membership restrictions.

Coverage gaps

• No channel membership management (join/leave/invite)
• No message scheduling or reminders
• No Slack apps, bots, or integrations
• No message formatting (Block Kit) — only plain text
• No custom emoji management
• No channel notification settings
• search_messages returns channel_scope_conflict when channel_id and query in:#channel point to different channels

Toolsets

27 tools total: 25 model-facing tools plus 2 state tools. Toolsets map to WORLDBENCH_TOOL_SETS values (prefixed form — e.g., slack_messages).

Toolset	Tools	Description
all / slack_all	25	All model-facing tools
read / slack_read	10	Model-facing read-only tools
write / slack_write	15	Model-facing write tools
slack_messages	7	Core messaging: post, reply, edit, delete, history, threads, search
slack_channels	5	Channel management: list, create, archive, rename, set topic
slack_reactions_pins	4	Reactions + pins: add reaction, pin/unpin, list pins
slack_users	4	User info: get users, get profile, get presence, set status
slack_files	2	File sharing: upload, list
slack_dms	3	Direct messages: open DM, list DMs, send DM
slack_admin	3	Admin-only operations: archive channel, rename channel, set topic (paired with is_admin: true)
slack_core	11	Baseline chat plus legacy Toolathlon reactions/profile tools
slack_toolathlon_legacy	8	Legacy Toolathlon tool subset (pre-integration)
slack_state	2	export_state, import_state for fixture seeding and grading

Admin mode. Set is_admin: true in the world's Slack state JSON to let the agent edit/delete any user's messages and perform channel-admin operations. Default false restricts writes to the bot user's own messages.

Bot user ID. Default U_MOCK_BOT. Override per world by setting bot_user_id in the state JSON — the value round-trips through export_state / import_state.