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Slack

io.github.mindstone/mcp-server-slack·v0.1.6·Chat & Messaging

Slack MCP server: channels, messages, threads, reactions, users, files, and scheduled messages

In-path gate · all MCP tools

Using Slack in Claude, Cursor, Gemini CLI, Cline, or Zed?

MCP tool contracts can change remotely with no version bump. The mcpindex gate pins each contract and HOLDs the call when it drifts—before your agent acts. Zero credentials. This is not the package install for this server itself (use Install this server for that).

Install the mcpindex gate (one command)

Rewrites your MCP host config so each server launches behind the gate. Inspect first: curl -fsSL https://mcpindex.ai/install.sh | less

curl -fsSL https://mcpindex.ai/install.sh | sh
Auditable install path →Watch it hold a drift →
Trust verdict · v1 advisory · method
REVIEWstatus: PARTIALfresh until 2026-07-01 10:00 UTC
screened 2026-06-01tier: scannedgranularity: description-levelsource: registry

Semantic screen found no manipulation pattern in the description. Conformance probe not yet run.

mcpindex.integrity.descriptionpassINFO

evidence“Describes declared capabilities”via static_description

Limits of this verdict
  • - Semantic screen only - the deterministic conformance probe has not run on this server
  • - Confidence is reported but not yet calibrated (v1)
  • - Screen reads the tool description, not the live behavior
  • - advisory
  • - registry description only no input schema

Semantic screen: an LLM judge reads the tool description for hidden instructions (status PARTIAL). A pass means the description is not lying, not that the tool is safe: a high-capability tool with an honest description still warrants caution. The deterministic conformance probe has not been run on this server yet, so the screen here is semantic-only. Posture: advisory. Confidences are reported but not yet calibrated (calibrated=false at v1). Full verdict history is not shown on this page.

Own this server? Screen its description →

Embed this badge

A live verdict badge for your README or listing. It reflects the current screen, links back here, and updates when the verdict does.

Markdown
[![mcpindex](https://mcpindex.ai/api/v1/badge/io-github-mindstone-mcp-server-slack)](https://mcpindex.ai/server/io-github-mindstone-mcp-server-slack)
HTML
<a href="https://mcpindex.ai/server/io-github-mindstone-mcp-server-slack"><img src="https://mcpindex.ai/api/v1/badge/io-github-mindstone-mcp-server-slack" alt="mcpindex verdict" height="20" /></a>
Environment variables
SLACK_CONFIG_PATH
required

Path to the host-managed Slack config directory

SLACK_TEAM_ID
required

Slack workspace team ID (one process per workspace)

SLACK_CLIENT_ID

Slack OAuth Connected App client ID. Only required to refresh a rotating token; saved non-rotating tokens authorize the Slack API without it.

SLACK_CLIENT_SECRET
secret

Slack OAuth Connected App client secret. Only required to refresh a rotating token; saved non-rotating tokens authorize the Slack API without it.

SLACK_DISABLE_REFRESH

Set to 1 to disable token refresh on this surface (cloud surface)

SLACK_REQUEST_TIMEOUT_MS

Override the upstream timeout (max 300000ms = 5 min)

SLACK_MAX_RETRIES

WebClient retries on transient failures (0-20). Lower this on cloud to avoid stacking long retry budgets into multi-minute hangs.

MCP quality score · maturity, not trust · methodology
freshness
25
completeness
15
installability
25
documentation
15
stability
5
Alternatives in Chat & Messaging
APIThreshold
ai.apithreshold/apithreshold

Quality scoring and progressive gates for AI-generated API tests. Stripe/Twilio profiles. Free tier.

ai.backengine/backengine-mcp
ai.backengine/backengine-mcp

Surface customer & prospect context from Slack, email, transcripts and tickets in any MCP client.

ai.kontato/kontato
ai.kontato/kontato

Give your AI agents a real WhatsApp number to send and receive messages.