Slack MCP by Nova (CIVAI)
co.civai.nova/mcp-slack_androidnova.civai.costreamable-httpv1.0.0Scanned
Use Slack from chat: see channels, catch up on messages, post updates, and reply in threads in your…
17 tools: 1 can delete or cancel things, 4 do something that can't be undone, 5 change things and 7 only read.
- Reads private data · 3
- Reads text others write · 3
- Can send data out · 6
- No findings
Anlyon alternative
10 of these tools change something. Run those as governed actions.
Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.
Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.
Import an OpenAPI spec →Tools
Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.
17 tools
Deletes or cancels 1Claude Code: deny
delete_messageDelete one of your messages.No findings
Why it is in this group
- The name "delete_message" says "delete": a word for removing or ending something.
Description, as the server wrote it Delete one of your messages.
Can't be undone 4Claude Code: ask
post_messagePost a message to a Slack channel or DM using the mobile user session.Can send data outNo findings
Why it is in this group
- The name "post_message" says "post" and "message": it sends a message, which cannot be taken back.
What it can reach
- outboundThe name "post_message" says "post" and "message": it sends something to other people.
- outboundThe input takes a destination (input.channel_id): what the tool writes goes there.
Description, as the server wrote it Post a message to a Slack channel or DM using the mobile user session.
post_message_richPost using mobile Block Kit blocks (message_blocks_json).Can send data outNo findings
Why it is in this group
- The name "post_message_rich" says "post" and "message": it sends a message, which cannot be taken back.
What it can reach
- outboundThe name "post_message_rich" says "post" and "message": it sends something to other people.
- outboundThe input takes a destination (input.channel_id): what the tool writes goes there.
Description, as the server wrote it Post using mobile Block Kit blocks (message_blocks_json).
reply_threadPost a reply in a thread.Can send data outNo findings
Why it is in this group
- The name "reply_thread" says "reply": a word for sending, and what is sent cannot be taken back.
What it can reach
- outboundThe name "reply_thread" says "reply": it sends or publishes something to other people.
- outboundThe input takes a destination (input.channel_id): what the tool writes goes there.
Description, as the server wrote it Post a reply in a thread.
thread_repliesRead messages in a thread.Can send data outNo findings
Why it is in this group
- The name "thread_replies" says "reply": a word for sending, and what is sent cannot be taken back.
What it can reach
- outboundThe name "thread_replies" says "reply": it sends or publishes something to other people.
- outboundThe input takes a destination (input.channel_id): what the tool writes goes there.
Description, as the server wrote it Read messages in a thread.
Changes things 5Claude Code: ask
channel_infoChannel name and member count for a channel id.Can send data outNo findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
What it can reach
- outboundThe input takes a destination (input.channel_id): what the tool writes goes there.
Description, as the server wrote it Channel name and member count for a channel id.
confirm_email_signinStart Slack email sign-in.No findings
Why it is in this group
- The description's first verb is "start": a word for a change.
Description, as the server wrote it Start Slack email sign-in.
create_channelCreate a channel (may be restricted on some workspaces).Can send data outNo findings
Why it is in this group
- The name "create_channel" says "create": a word for a change.
What it can reach
- outboundThe input takes a destination (input.channel_name): what the tool writes goes there.
Description, as the server wrote it Create a channel (may be restricted on some workspaces).
open_conversationOpen a DM conversation with a Slack user id.No findings
Why it is in this group
- The name "open_conversation" says "open": a word for a change.
Description, as the server wrote it Open a DM conversation with a Slack user id.
user_bootWorkspace client bootstrap after login.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it Workspace client bootstrap after login.
Only reads 7Show 7 read-only tools
conversation_historyFetch recent messages in a channel.Reads private dataReads text others writeNo findings
Why it is in this group
- The description's first verb is "fetch": a word for reading.
What it can reach
- private-dataThe name "conversation_history" says "conversation": it reads messages.
- private-dataThe description's first sentence says "fetch" and "message": it reads messages.
- untrusted-inputThe name "conversation_history" says "conversation": it reads messages, which other people can write.
- untrusted-inputThe description's first sentence says "fetch" and "message": it reads messages, which other people can write.
Description, as the server wrote it Fetch recent messages in a channel.
list_channel_membersList member user ids in a Slack channel.No findings
Why it is in this group
- The name "list_channel_members" says "list": a word for reading.
Description, as the server wrote it List member user ids in a Slack channel.
list_channelsList Slack channels and group DMs (mobile client.channels).No findings
Why it is in this group
- The name "list_channels" says "list": a word for reading.
Description, as the server wrote it List Slack channels and group DMs (mobile client.channels).
list_workspace_usersList users in the workspace.No findings
Why it is in this group
- The name "list_workspace_users" says "list": a word for reading.
Description, as the server wrote it List users in the workspace.
list_workspacesList workspaces after email confirmation.Reads private dataReads text others writeNo findings
Why it is in this group
- The name "list_workspaces" says "list": a word for reading.
What it can reach
- private-dataThe description's first sentence says "list" and "email": it reads mail.
- untrusted-inputThe description's first sentence says "list" and "email": it reads inbound email, which other people can write.
Description, as the server wrote it List workspaces after email confirmation.
search_peopleSearch people by name or email fragment.Reads private dataReads text others writeNo findings
Why it is in this group
- The name "search_people" says "search": a word for reading.
What it can reach
- private-dataThe description's first sentence says "search" and "email": it reads mail.
- untrusted-inputThe description's first sentence says "search" and "email": it reads inbound email, which other people can write.
Description, as the server wrote it Search people by name or email fragment.
session_statusVerify Slack mobile session (run before other tools).No findings
Why it is in this group
- The name "session_status" says "status": a word for reading.
Description, as the server wrote it Verify Slack mobile session (run before other tools).
This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.
Exfil surface
Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.
54 paths in this server alone from private data, through text someone else wrote, to a way out. Denying 3 untrusted-input tools breaks every one.
- Reads private data3
- Reads files, mail, messages, databases, secrets, calendars or repositories.
- Reads text others write3
- Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
- Can send data out6
- Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.
{
"permissions": {
"deny": [
"mcp__slack_android__conversation_history",
"mcp__slack_android__list_workspaces",
"mcp__slack_android__search_people"
]
}
}Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.
Findings
Matches of fixed checks, with the text they matched.
No check matched anything in these tool definitions. That is not a safety guarantee.
History
Changes to its tool definitions and to its remote endpoint, newest first.
No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.
Install
Pinned to version 1.0.0. Values in angle brackets are yours to fill in.
claude mcp add --transport http slack_android https://nova.civai.co/mcp/agents/mcp-slack_androidclaude mcp add --transport http slack_android https://nova.civai.co/mcp/agents/mcp-slack_androidRun in a terminal.
Claude Code permissions
Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.
{
"permissions": {
"allow": [
"mcp__slack_android__session_status",
"mcp__slack_android__list_channels",
"mcp__slack_android__list_channel_members",
"mcp__slack_android__list_workspace_users",
"mcp__slack_android__search_people",
"mcp__slack_android__conversation_history",
"mcp__slack_android__list_workspaces"
],
"ask": [
"mcp__slack_android__channel_info",
"mcp__slack_android__post_message_rich",
"mcp__slack_android__thread_replies",
"mcp__slack_android__reply_thread",
"mcp__slack_android__post_message",
"mcp__slack_android__open_conversation",
"mcp__slack_android__create_channel",
"mcp__slack_android__user_boot",
"mcp__slack_android__confirm_email_signin"
],
"deny": [
"mcp__slack_android__delete_message"
]
}
}Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as slack_android. Review it before you use it.
Capability tags behind 9 rules
- mcp__slack_android__channel_info outbound
- mcp__slack_android__search_people private-data, untrusted-input
- mcp__slack_android__post_message_rich outbound
- mcp__slack_android__thread_replies outbound
- mcp__slack_android__reply_thread outbound
- mcp__slack_android__post_message outbound
- mcp__slack_android__conversation_history private-data, untrusted-input
- mcp__slack_android__create_channel outbound
- mcp__slack_android__list_workspaces private-data, untrusted-input
Pin
Keep the decision: fail CI when the tools change, follow every change, or show a badge.
Pin in CI
Fail a build when the tools you reviewed are not the tools the server serves today.
curl -s "https://anlyon.dev/api/v1/servers/co.civai.nova/mcp-slack_android/verify?hash=59aa7f66029097158d7e6e17631ef5316239222b6f9dd82c3bfabaf0f0b607cf" | jq -e '.changed == false'Pinned hash 59aa7f660290, from Nov 2, 2026, 09:18 UTC.
Watch
Get told when its tools change: a new tool, a new description, a new class.
https://anlyon.dev/servers/co.civai.nova/mcp-slack_android/changes.xmlAn Atom feed. Works in any feed reader or Slack's RSS app.
Badge
[](https://anlyon.dev/servers/co.civai.nova/mcp-slack_android)Source: MCP Registry. Synced Nov 2, 2026, 09:17 UTC.