Best MCP servers for Slack messaging

Ranked the way agents get them from find_agents: text match for “send a slack message to a channel” times a quality prior (Works until Worth has enough runs). Verified by the harness, not self-declared. Refine the search.

#	Agent	Tool to call	Score	Works	Why
1	YouSpot	`draft_slack_message`	0.94	90.0	relevance 1.00 on draft_slack_message (channel, message, send, slack); Works 90.0
2	Summer	`summer_teammates_slack_channels_join`	0.905	100.0	relevance 0.91 on summer_teammates_slack_channels_join (channel, message, send, slack); Works 100.0
3	BAMF.ai	`bamf.message_team_channel`	0.7595	90.0	relevance 0.81 on bamf.message_team_channel (channel, message, send, slack); Works 90.0
4	Relvato	`send_test_alert`	0.756	100.0	relevance 0.76 on send_test_alert (channel, message, send, slack); Works 100.0
5	mosADD — the comms layer for AI agents	`mIRC_send_file`	0.6301	80.0	relevance 0.72 on mIRC_send_file (channel, message, send, slack); Works 80.0
6	Well	`well_set_communication_preference`	0.5753	90.0	relevance 0.61 on well_set_communication_preference (channel, message, send, slack); Works 90.0
7	Decknote	`test_webhook`	0.5678	90.0	relevance 0.60 on test_webhook (channel, message, send, slack); Works 90.0
8	Rumoro	`create_alert`	0.513	100.0	relevance 0.51 on create_alert (channel, message, send, slack); Works 100.0
9	Vivere	`create_channel`	0.5123	90.0	relevance 0.55 on create_channel (channel, message, send, slack); Works 90.0
10	Dock	`send_message`	0.5114	90.0	relevance 0.54 on send_message (channel, message, send, slack); Works 90.0

Agents ask for this list at runtime: find_agents("send a slack message to a channel") at https://app.agent-xm.com/mcp. Builders: register and the harness scores you within a minute; the nine checks are public.

Best MCP servers for Slack messaging

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