Use Slack from chat: see channels, catch up on messages, post updates, and reply in threads in your…
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Channel name and member count for a channel id.
Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names.
This tool isn't marked read-only, so it may change something on the server or in an account you connected.
Pick your client. Values in capitals, like YOUR_TOKEN, are yours to fill in.
claude mcp add --transport http mcp-slack_android https://nova.civai.co/mcp/agents/mcp-slack_android
Channel name and member count for a channel id.
| Argument | Type | Description |
|---|---|---|
| channel_id* | string | |
| notification_message | string | Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names. |
{
"type": "object",
"required": [
"channel_id"
],
"properties": {
"channel_id": {
"type": "string"
},
"notification_message": {
"type": "string",
"description": "Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names."
}
}
}Start Slack email sign-in.
| Argument | Type | Description |
|---|---|---|
| slack_email | string | |
| notification_message | string | Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names. |
{
"type": "object",
"properties": {
"slack_email": {
"type": "string"
},
"notification_message": {
"type": "string",
"description": "Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names."
}
}
}Fetch recent messages in a channel.
| Argument | Type | Description |
|---|---|---|
| channel_id* | string | |
| history_limit | string | |
| notification_message | string | Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names. |
{
"type": "object",
"required": [
"channel_id"
],
"properties": {
"channel_id": {
"type": "string"
},
"history_limit": {
"type": "string"
},
"notification_message": {
"type": "string",
"description": "Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names."
}
}
}Create a channel (may be restricted on some workspaces).
| Argument | Type | Description |
|---|---|---|
| is_private | string | |
| channel_name* | string | |
| notification_message | string | Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names. |
{
"type": "object",
"required": [
"channel_name"
],
"properties": {
"is_private": {
"enum": [
"true",
"false"
],
"type": "string"
},
"channel_name": {
"type": "string"
},
"notification_message": {
"type": "string",
"description": "Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names."
}
}
}Delete one of your messages.
| Argument | Type | Description |
|---|---|---|
| channel_id* | string | |
| message_ts* | string | |
| notification_message | string | Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names. |
{
"type": "object",
"required": [
"channel_id",
"message_ts"
],
"properties": {
"channel_id": {
"type": "string"
},
"message_ts": {
"type": "string"
},
"notification_message": {
"type": "string",
"description": "Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names."
}
}
}List member user ids in a Slack channel.
| Argument | Type | Description |
|---|---|---|
| channel_id* | string | |
| members_limit | string | |
| notification_message | string | Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names. |
{
"type": "object",
"required": [
"channel_id"
],
"properties": {
"channel_id": {
"type": "string"
},
"members_limit": {
"type": "string"
},
"notification_message": {
"type": "string",
"description": "Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names."
}
}
}List Slack channels and group DMs (mobile client.channels).
| Argument | Type | Description |
|---|---|---|
| notification_message | string | Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names. |
{
"type": "object",
"properties": {
"notification_message": {
"type": "string",
"description": "Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names."
}
}
}List users in the workspace.
| Argument | Type | Description |
|---|---|---|
| users_limit | string | |
| notification_message | string | Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names. |
{
"type": "object",
"properties": {
"users_limit": {
"type": "string"
},
"notification_message": {
"type": "string",
"description": "Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names."
}
}
}List workspaces after email confirmation.
| Argument | Type | Description |
|---|---|---|
| notification_message | string | Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names. |
{
"type": "object",
"properties": {
"notification_message": {
"type": "string",
"description": "Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names."
}
}
}Open a DM conversation with a Slack user id.
| Argument | Type | Description |
|---|---|---|
| slack_user_id* | string | |
| notification_message | string | Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names. |
{
"type": "object",
"required": [
"slack_user_id"
],
"properties": {
"slack_user_id": {
"type": "string"
},
"notification_message": {
"type": "string",
"description": "Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names."
}
}
}Post a message to a Slack channel or DM using the mobile user session.
| Argument | Type | Description |
|---|---|---|
| channel_id* | string | |
| message_text* | string | |
| notification_message | string | Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names. |
{
"type": "object",
"required": [
"channel_id",
"message_text"
],
"properties": {
"channel_id": {
"type": "string"
},
"message_text": {
"type": "string"
},
"notification_message": {
"type": "string",
"description": "Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names."
}
}
}Post using mobile Block Kit blocks (message_blocks_json).
| Argument | Type | Description |
|---|---|---|
| channel_id* | string | |
| message_blocks_json* | string | |
| notification_message | string | Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names. |
{
"type": "object",
"required": [
"channel_id",
"message_blocks_json"
],
"properties": {
"channel_id": {
"type": "string"
},
"message_blocks_json": {
"type": "string"
},
"notification_message": {
"type": "string",
"description": "Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names."
}
}
}Post a reply in a thread.
| Argument | Type | Description |
|---|---|---|
| thread_ts* | string | |
| channel_id* | string | |
| message_text* | string | |
| notification_message | string | Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names. |
{
"type": "object",
"required": [
"channel_id",
"thread_ts",
"message_text"
],
"properties": {
"thread_ts": {
"type": "string"
},
"channel_id": {
"type": "string"
},
"message_text": {
"type": "string"
},
"notification_message": {
"type": "string",
"description": "Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names."
}
}
}Search people by name or email fragment.
| Argument | Type | Description |
|---|---|---|
| people_page | string | |
| people_count | string | |
| search_query* | string | |
| notification_message | string | Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names. |
{
"type": "object",
"required": [
"search_query"
],
"properties": {
"people_page": {
"type": "string"
},
"people_count": {
"type": "string"
},
"search_query": {
"type": "string"
},
"notification_message": {
"type": "string",
"description": "Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names."
}
}
}Verify Slack mobile session (run before other tools).
| Argument | Type | Description |
|---|---|---|
| notification_message | string | Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names. |
{
"type": "object",
"properties": {
"notification_message": {
"type": "string",
"description": "Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names."
}
}
}Read messages in a thread.
| Argument | Type | Description |
|---|---|---|
| thread_ts* | string | |
| channel_id* | string | |
| replies_limit | string | |
| notification_message | string | Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names. |
{
"type": "object",
"required": [
"channel_id",
"thread_ts"
],
"properties": {
"thread_ts": {
"type": "string"
},
"channel_id": {
"type": "string"
},
"replies_limit": {
"type": "string"
},
"notification_message": {
"type": "string",
"description": "Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names."
}
}
}Workspace client bootstrap after login.
| Argument | Type | Description |
|---|---|---|
| notification_message | string | Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names. |
{
"type": "object",
"properties": {
"notification_message": {
"type": "string",
"description": "Short user-facing sentence for this action if the follow-up reply fails. Plain text only; do not mention template syntax or variable names."
}
}
}We read every tool's name, description and inputs the way the model will, looking for instructions hidden from you. A clean result means no warning signs, not a guarantee. Scanned Nov 2, 2026.
No readOnlyHint / destructiveHint annotations, so clients can't tell a read from a write without asking.
Fix: Add annotations to each tool, e.g. { readOnlyHint: true } for tools that only read.