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Slack (cloud9-labs) MCP Server

@cloud9-labs/mcp-slack npm v0.1.0

Published by @cloud9-labs — no publish provenance, so origin is unverified, but the source is public: the repository link below is self-declared yet readable, so you can inspect the code before adopting it.

MCP server for Slack API - send messages, manage channels, users, and reactions

View on npm ↗ Repository ↗ Raw report (JSON) ↗
Trust grade
A
96/100
Last scanned get badge →
Trust
A · 96/100
Adoption risk for you: the threat score, then adjusted down for blast radius, publisher verification and how much the scan could see. Deterministic; every point is auditable.
Capability
Moderate
Blast radius if it went rogue — what the server’s tools could reach. Independent of trust.
Coverage
Source
How much the scan could actually inspect. Shallow coverage is stated, never hidden.
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A Why this grade threat 100 − adoption risk = 96/100

The grade answers one question — how safe is this server for you to adopt — so it is computed in two auditable stages. Nothing below is an opinion or an LLM's guess; every line is a real term the deterministic engine applied, and the same input always yields the same number.

1. Threat score — 100 − 0 = 100. What the published surface and source actually contain:

The deterministic scan raised no scored threat in the surface it inspected — the threat score stayed at 100. Capability observations and advisory notes are recorded but never lower it.

2. Client adoption risk — 100 − 4 = 96. Three small, subtract-only factors that reflect your risk in adopting it — a clean scan proves less on a powerful, unverified or barely-inspectable package, so the grade says so plainly:

PointsAdoption-risk factor
−3 capability blast radius (moderate) — client exposure if the model is manipulated
−1 publisher verification (public source) — no provenance, but the source is public and inspectable

Capability observations and info notes are shown under Findings but never scored. Open any row's finding below for the file, line and evidence behind a deduction.

Findings 0

✓ No findings. The scan raised nothing on this surface — see Coverage for how deep it could look.

Tools 14

Each tool and what it can reach — statically extracted from the published source.

  • slack_post_messagenetwork egress
  • slack_upload_filenetwork egress
  • slack_add_reactionno sensitive capability
  • slack_delete_messageno sensitive capability
  • slack_get_channel_historyno sensitive capability
  • slack_get_channel_infono sensitive capability
  • slack_get_repliesno sensitive capability
  • slack_get_user_infono sensitive capability
  • slack_join_channelno sensitive capability
  • slack_list_channelsno sensitive capability
Show 4 more tools ↓
  • slack_list_usersno sensitive capability
  • slack_remove_reactionno sensitive capability
  • slack_search_messagesno sensitive capability
  • slack_update_messageno sensitive capability

What this scan could not see

Versions 1

Scan history per published version. The engine is deterministic — the same version always yields the same score, so a changed score means the package itself changed.

VersionScoreFindingsEngineScanned
v0.1.0 latest A 96/100 0 1.13.0 2026-09-07

Embed this score

Show this server's live Trust Score in your README, docs or website. The badge is served straight from the registry and updates automatically after every rescan — no API key needed. It links back to this page, so anyone who sees the grade can also read the findings behind it instead of taking a number on faith.

MCP Trust Score: A · 96/100
Markdown (GitHub README)
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Verify this score yourself

The score above is reproducible: the same package version always yields the same result. Run it locally or over the free API — no account, no LLM, fully deterministic.

npx mcptrustchecker scan @cloud9-labs/mcp-slack --online

Use the free API → How scoring works

Other implementations of Slack 29

Independent packages implementing the same tool, scanned with the same engine. Compare all 30 side by side →

Slack (nrjdalal) Source verified npm
A
@nrjdalal/slack-mcp-server

User-token (xoxp) Slack MCP server over stdio

Marketing & Social Score 100/100 0 findings 20/wk Cap. Minimal
Slack (tomgutt) npm
A
slack-mcp

Integrate the Slack Web API into agentic workflows via MCP

Communication & Collaboration Score 99/100 0 findings 54/wk Cap. Minimal
Slack (node2flow) npm
A
@node2flow/slack-mcp

MCP server for Slack Web API — send messages, manage channels, search, reactions, files, pins, bookmarks, and more through 38 tools

Marketing & Social Score 99/100 0 findings 26/wk Cap. Minimal
Slack (bossforce.ai) npm
A
@bossforce.ai/mcp-slack

MCP server for the Slack **Web API**, acting as a bot user (`xoxb-` token). A good fit for internal team notifications and reports.

Communication & Collaboration Score 99/100 0 findings 14/wk Cap. Minimal
Slack (universal-mcp-toolkit) npm
A
@universal-mcp-toolkit/server-slack

Channel lookup, history, and messaging tools for Slack workspaces.

Browser Automation Score 99/100 0 findings 12/wk Cap. Minimal
Slack (npm) npm
A
mcp-server-slack

MCP Server for Slack API integration

Communication & Collaboration Score 98/100 0 findings 171/wk Cap. Minimal

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