MCP Slack
PYPI · MCP-SLACK-CRUNCHTOOLS
Secure read-only MCP server for Slack workspaces
Available components
Last scanned (21 hours ago)
Scores higher than 82% of PyPI servers
Category Communication
How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. How we score → Why this is hard to score →
Supply Chain Security50
- Malware scan not yet available for this package.Unverified
- No known CVEs affecting this package version or its production dependencies.Pass
- Runs hatchling.build at install time, a recognised build step with no custom scripting around it. View diagnostics → Pass
- 1 of 22 dependencies flagged as unhealthy. View diagnostics → Partial
Provenance & Transparency100
- Source repository is publicly reachable at the declared URL. View diagnostics → Pass
- Cryptographically verified build provenance (signed, bound to crunchtools/mcp-slack). View diagnostics → Pass
- Clear OSI-approved license (AGPL-3.0-or-later).Pass
- Actively maintained (last published 3 days ago).Pass
- Publishes a security disclosure policy (SECURITY.md).Pass
Schema Quality & AI Usability76
- AI-judged instruction clarity (good).Pass
- Tool/resource definitions use about 1164 tokens (~77/item across 15 items; 15 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
- Structured output schemas are declared (100% of tools); any adoption earns full credit.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 15 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 16 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a current MCP spec version (2026-07-28).Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 2 Nov 26 −15
- Malware scan: pass → unverified ▼ security
- 1 Nov 26 +1
- Stability: 0.97 → pass security
- 31 Oct 26 +15
- Malware scan: unverified → pass ▲ security
- 30 Oct 26 −1
- Stability: pass → 0.93 functional
- 29 Oct 26 −15
- Malware scan: pass → unverified ▼ security
- 27 Oct 26 +15
- Malware scan: unverified → pass ▲ security
- 26 Oct 26 −15
- Malware scan: pass → unverified ▼ security
- 23 Oct 26 +15
- Malware scan: unverified → pass ▲ security
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 4 Nov 2026 · Analysed pypi/mcp-slack-crunchtools@0.1.2
Provenance Verified
A signed build attestation was found and verified, binding this exact artifact to the source repository it claims to come from.
| Result | Verified |
|---|---|
| Ecosystem | pypi |
| Reason | Verified |
| Discovered via | Registry attestation endpoint |
| Source repo | crunchtools/mcp-slack |
| Certificate issuer | https://token.actions.githubusercontent.com |
| Certificate SAN | https://github.com/crunchtools/mcp-slack/.github/workflows/publish.yml@refs/tags/v0.1.2 |
| Rekor log index | 1181819015 |
| Predicate type | PyPI publish attestation https://docs.pypi.org/attestations/publish/v1 |
| Subject digest | sha256:f964666f43faf3eec108ae50527664a93401ab2c664128676837f499e3830cf2 |
Background: How many MCP packages publish verified provenance →
Install scripts 1 script
| Hook | Tier | Command |
|---|---|---|
| build_backend | allowlisted | hatchling.build |
Background: Why install scripts are a supply-chain risk →
Dependencies 22 packages
| Packages resolved | 22 |
|---|---|
| Stale | 1 |
| Tree resolution | Complete |
Background: SBOMs and build attestations, explained →
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
slack_auth_test Slack Auth Test ~47
Test Slack authentication and get info about the token owner. Returns the authenticated user's ID, team ID, team name, username, and workspace URL. Use this to verify the connection is working.
Input schema present but exposes no named parameters.
Structured output declared, but exposes no named fields.
No examples provided.
slack_get_channel_history Slack Get Channel History ~114
Get message history from a Slack channel.
| Name | Type | Req | Description |
|---|---|---|---|
| channel_id | string | yes | Channel ID (starts with C, D, or G) |
| cursor | – | – | Pagination cursor from previous response |
| inclusive | boolean | – | Include messages at oldest/latest boundary |
| latest | – | – | Only messages before this timestamp |
| limit | integer | – | Max messages to return, 1-1000 (default: 100) |
| oldest | – | – | Only messages after this timestamp (e.g., 1234567890.123456) |
Structured output declared, but exposes no named fields.
No examples provided.
slack_get_channel_info Slack Get Channel Info ~37
Get detailed information about a Slack channel.
| Name | Type | Req | Description |
|---|---|---|---|
| channel_id | string | yes | Channel ID (starts with C, D, or G) |
Structured output declared, but exposes no named fields.
No examples provided.
slack_get_file_info Slack Get File Info ~67
Get metadata about a Slack file (no content download).
| Name | Type | Req | Description |
|---|---|---|---|
| count | integer | – | Number of comments per page (default: 100) |
| file_id | string | yes | File ID (starts with F) |
| page | integer | – | Page of comments (default: 1) |
Structured output declared, but exposes no named fields.
No examples provided.
slack_get_reactions Slack Get Reactions ~75
Get reactions for a specific Slack message.
| Name | Type | Req | Description |
|---|---|---|---|
| channel_id | string | yes | Channel ID (starts with C, D, or G) |
| full | boolean | – | If true, return complete reaction list for each emoji |
| timestamp | string | yes | Message timestamp (e.g., 1234567890.123456) |
Structured output declared, but exposes no named fields.
No examples provided.
slack_get_thread_replies Slack Get Thread Replies ~116
Get replies in a Slack message thread.
| Name | Type | Req | Description |
|---|---|---|---|
| channel_id | string | yes | Channel ID (starts with C, D, or G) |
| cursor | – | – | Pagination cursor from previous response |
| inclusive | boolean | – | Include messages at oldest/latest boundary |
| latest | – | – | Only replies before this timestamp |
| limit | integer | – | Max replies to return, 1-1000 (default: 100) |
| oldest | – | – | Only replies after this timestamp |
| thread_ts | string | yes | Timestamp of the parent message |
Structured output declared, but exposes no named fields.
No examples provided.
slack_get_user_info Slack Get User Info ~36
Get information about a Slack user.
| Name | Type | Req | Description |
|---|---|---|---|
| user_id | string | yes | User ID (starts with U, W, or B) |
Structured output declared, but exposes no named fields.
No examples provided.
slack_get_user_profile Slack Get User Profile ~49
Get a Slack user's profile information.
| Name | Type | Req | Description |
|---|---|---|---|
| include_labels | boolean | – | Include custom profile field labels |
| user_id | string | yes | User ID (starts with U, W, or B) |
Structured output declared, but exposes no named fields.
No examples provided.
slack_list_channel_members Slack List Channel Members ~68
List members of a Slack channel.
| Name | Type | Req | Description |
|---|---|---|---|
| channel_id | string | yes | Channel ID (starts with C, D, or G) |
| cursor | – | – | Pagination cursor from previous response |
| limit | integer | – | Max members to return, 1-1000 (default: 200) |
Structured output declared, but exposes no named fields.
No examples provided.
slack_list_channels Slack List Channels ~88
List channels in the Slack workspace.
| Name | Type | Req | Description |
|---|---|---|---|
| cursor | – | – | Pagination cursor from previous response |
| exclude_archived | boolean | – | Exclude archived channels (default: true) |
| limit | integer | – | Max results per page, 1-1000 (default: 200) |
| types | string | – | Comma-separated channel types: public_channel, private_channel, mpim, im |
Structured output declared, but exposes no named fields.
No examples provided.
slack_list_files Slack List Files ~133
List files in the Slack workspace (metadata only, no content download).
| Name | Type | Req | Description |
|---|---|---|---|
| channel_id | – | – | Filter by channel ID |
| count | integer | – | Results per page, 1-100 (default: 100) |
| page | integer | – | Page number (default: 1) |
| ts_from | – | – | Filter files created after this Unix timestamp |
| ts_to | – | – | Filter files created before this Unix timestamp |
| types | – | – | Filter by types (comma-separated: spaces, snippets, images, gdocs, zips, pdfs, all) |
| user_id | – | – | Filter by uploader's user ID |
Structured output declared, but exposes no named fields.
No examples provided.
slack_list_reactions Slack List Reactions ~82
List reactions made by a user.
| Name | Type | Req | Description |
|---|---|---|---|
| count | integer | – | Results per page, 1-100 (default: 100) |
| full | boolean | – | If true, return complete reaction list |
| page | integer | – | Page number (default: 1) |
| user_id | – | – | User ID to list reactions for (default: authenticated user) |
Structured output declared, but exposes no named fields.
No examples provided.
slack_list_stars Slack List Stars ~62
List starred items for the authenticated user.
| Name | Type | Req | Description |
|---|---|---|---|
| count | integer | – | Results per page, 1-100 (default: 100) |
| cursor | – | – | Pagination cursor from previous response |
| page | integer | – | Page number (default: 1) |
Structured output declared, but exposes no named fields.
No examples provided.
slack_list_users Slack List Users ~48
List users in the Slack workspace.
| Name | Type | Req | Description |
|---|---|---|---|
| cursor | – | – | Pagination cursor from previous response |
| limit | integer | – | Max users to return, 1-1000 (default: 200) |
Structured output declared, but exposes no named fields.
No examples provided.
slack_search_messages Slack Search Messages ~129
Search messages in the Slack workspace. Supports Slack search modifiers: from:user, in:channel, has:link, before:date, after:date, during:month.
| Name | Type | Req | Description |
|---|---|---|---|
| count | integer | – | Results per page, 1-100 (default: 20) |
| page | integer | – | Page number (default: 1) |
| query | string | yes | Search query string |
| sort | string | – | Sort by "timestamp" or "score" (default: timestamp) |
| sort_dir | string | – | Sort direction "asc" or "desc" (default: desc) |
Structured output declared, but exposes no named fields.
No examples provided.
How do I install the MCP Slack server?
MCP Slack runs locally as a PyPI package, launched with uvx mcp-slack-crunchtools. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
pypi · mcp-slack-crunchtools
claude mcp add crunchtools-slack -- uvx mcp-slack-crunchtools
What is the MCP Slack server?
MCP Slack is listed in the public MCP registry as io.github.crunchtools/slack. Secure read-only MCP server for Slack workspaces. This page covers its PyPI package (mcp-slack-crunchtools).
Is the MCP Slack server safe to use?
MCP Slack scores 81 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 4 November 2026. Its build provenance is signed and verified. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the MCP Slack server expose?
MCP Slack exposes 15 tools: slack_auth_test, slack_list_channels, slack_get_channel_info, slack_get_channel_history, slack_get_thread_replies, and 10 more. Their descriptions and schemas cost roughly 1,151 tokens of context every time the server is loaded.
Is the MCP Slack server still maintained?
MCP Slack is still listed as active in the MCP registry. We last reached this channel on 4 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.
What licence is the MCP Slack server under?
MCP Slack declares the AGPL-3.0-or-later licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.