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MCP Slack Server

Anthropic (Archived)

78·Strong

Overall Trust Score

ARCHIVED: Former official MCP server for Slack workspace interaction. This server is NO LONGER MAINTAINED. Moved to servers-archived repository. No security updates provided. Community alternatives may be available.

communication
collaboration
mcp
model-context-protocol
Version: 2025.4.24
Last Evaluated: November 9, 2025
Official Website →

Trust Vector

Performance & Reliability

84
message delivery reliability
90
Methodology
Message delivery success testing
Evidence
Slack API Documentation
High reliability for message posting and retrieval via Web API
Date: 2025-11-16
Confidence: highLast verified: 2025-11-09
search accuracy
85
Methodology
Search quality testing
Evidence
Slack Search API
Powerful message search with filters and context
Date: 2025-11-16
Confidence: highLast verified: 2025-11-09
rate limit handling
78
Methodology
Rate limiting behavior testing
Evidence
Slack Rate Limits
Tier-based rate limits (1+ requests per second), requires careful handling
Date: 2025-11-16
Confidence: mediumLast verified: 2025-11-09
real time updates
82
Methodology
Event delivery latency testing
Evidence
Slack Events API
Events API enables near real-time message notifications
Date: 2025-11-16
Confidence: mediumLast verified: 2025-11-09
error recovery
80
Methodology
Error handling testing
Evidence
Slack API Error Handling
Clear error codes with retry guidance
Date: 2025-11-16
Confidence: mediumLast verified: 2025-11-09

Security

74
oauth security
85
Methodology
Authentication security review
Evidence
Slack OAuth
Secure OAuth 2.0 with granular permission scopes
Date: 2025-11-16
Confidence: highLast verified: 2025-11-09
message access risk
68
Methodology
Access boundary testing
Evidence
Security Analysis
AI can read all messages in channels within granted scope
Date: 2025-11-16
Confidence: highLast verified: 2025-11-09
posting control
70
Methodology
Message posting capability testing
Evidence
Slack Permissions
AI can post messages as bot or user depending on scope
Date: 2025-11-16
Confidence: mediumLast verified: 2025-11-09
data exfiltration risk
72
Methodology
Data exposure analysis
Evidence
Data Flow Analysis
Workspace messages sent to LLM provider for processing
Date: 2025-11-16
Confidence: highLast verified: 2025-11-09
audit logging
82
Methodology
Audit capabilities review
Evidence
Slack Audit Logs
Enterprise Grid provides comprehensive audit logs
Date: 2025-11-16
Confidence: highLast verified: 2025-11-09

Privacy & Compliance

70
message exposure
65
Methodology
Data exposure analysis
Evidence
MCP Data Flow
Slack messages including private conversations sent to LLM provider
Date: 2025-11-16
Confidence: highLast verified: 2025-11-09
pii protection
62
Methodology
Privacy controls assessment
Evidence
MCP Security Guidelines
No built-in PII detection or message content filtering
Date: 2025-11-16
Confidence: mediumLast verified: 2025-11-09
workspace admin control
78
Methodology
Enterprise control assessment
Evidence
Slack Admin Controls
Workspace admins can control app installations and permissions
Date: 2025-11-16
Confidence: highLast verified: 2025-11-09
data retention
72
Methodology
Data retention policy review
Evidence
Slack DLP
Slack retains messages per workspace policy, additional copies sent to LLM
Date: 2025-11-16
Confidence: mediumLast verified: 2025-11-09
compliance readiness
73
Methodology
Compliance framework review
Evidence
Slack Compliance
Slack is compliant, but third-party LLM sharing affects compliance posture
Date: 2025-11-16
Confidence: mediumLast verified: 2025-11-09

Trust & Transparency

81
documentation quality
88
Methodology
Documentation completeness review
Evidence
Slack API Documentation
Comprehensive Slack API docs with examples and guides
Date: 2025-11-16
Confidence: highLast verified: 2025-11-09
operation visibility
82
Methodology
Operation traceability assessment
Evidence
Slack Activity
All API actions logged in audit logs and visible in channels
Date: 2025-11-16
Confidence: highLast verified: 2025-11-09
permission transparency
80
Methodology
Permission clarity assessment
Evidence
OAuth Scopes
Clear permission descriptions during OAuth flow
Date: 2025-11-16
Confidence: mediumLast verified: 2025-11-09
mcp implementation
75
Methodology
Implementation documentation review
Evidence
Community Implementation
Community-maintained with variable documentation quality
Date: 2025-11-16
Confidence: mediumLast verified: 2025-11-09

Operational Excellence

80
ease of setup
78
Methodology
Setup complexity assessment
Evidence
Slack App Setup
Requires Slack app creation and OAuth configuration
Date: 2025-11-16
Confidence: mediumLast verified: 2025-11-09
api reliability
88
Methodology
Uptime analysis
Evidence
Slack Status
High uptime and reliability (>99.9%)
Date: 2025-11-16
Confidence: highLast verified: 2025-11-09
response time
82
Methodology
Performance benchmarking
Evidence
API Performance
Good API response times (100-300ms typical)
Date: 2025-11-16
Confidence: mediumLast verified: 2025-11-09
feature coverage
76
Methodology
Feature completeness assessment
Evidence
MCP Slack Server
Covers basic message reading/posting, limited channel management
Date: 2025-11-16
Confidence: mediumLast verified: 2025-11-09
cost
75
Methodology
Cost analysis
Evidence
Slack API Pricing
Free for basic API usage, costs from Slack workspace subscription
Date: 2025-11-16
Confidence: highLast verified: 2025-11-09

✨ Strengths

  • •Powerful team communication and collaboration automation
  • •Comprehensive Slack API with rich feature set
  • •High reliability and uptime from Slack infrastructure
  • •Granular OAuth permission scopes for access control
  • •Excellent audit logging for Enterprise Grid customers
  • •Real-time message capabilities through Events API

⚠️ Limitations

  • •Workspace messages exposed to LLM provider APIs
  • •No built-in content filtering or PII protection
  • •Risk of exposing confidential team communications
  • •Rate limits can be restrictive for high-volume operations
  • •Community-maintained MCP server with variable support
  • •Compliance challenges when sharing workspace data with third parties

📊 Metadata

license: Varies (Slack API proprietary, MCP implementation varies)
supported platforms:
0: All platforms with OAuth support
programming languages:
0: TypeScript
1: Python
2: Any language with Slack SDK
mcp version: 1.0
api provider: Slack Technologies
authentication: OAuth 2.0
api version: Slack Web API
rate limits: Tier-based (1+ requests per second)
first release: 2024-11
maintained by: Community

Use Case Ratings

code generation

72

Useful for posting code snippets and updates, but limited for actual generation

customer support

88

Excellent for internal support channels and team communication automation

content creation

75

Good for collaborative content discussions, but not primary use case

data analysis

78

Useful for analyzing team communication patterns and sentiment

research assistant

82

Good for searching team knowledge and past discussions

legal compliance

60

Risk of exposing confidential team communications to LLM providers

healthcare

55

High risk if PHI discussed in Slack; compliance challenges

financial analysis

65

Risky for confidential financial discussions; requires careful controls

education

85

Great for classroom communication and student collaboration

creative writing

70

Useful for collaborative writing discussions but not primary tool