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CSOAI-ORG

Slack Enterprise MCP Server

list_channels

List Slack channels with member counts and topics. Filter by public or private channel types.

Instructions

List Slack channels with member counts and topics. Types can be 'public_channel', 'private_channel', or 'public_channel,private_channel'.

Behavior: This tool is read-only and stateless — it produces analysis output without modifying any external systems, databases, or files. Safe to call repeatedly with identical inputs (idempotent). Free tier: 10/day rate limit. Pro tier: unlimited. No authentication required for basic usage.

When to use: Use this tool when you need structured analysis or classification of inputs against established frameworks or standards.

When NOT to use: Not suitable for real-time production decision-making without human review of results.

Args: limit (int): The limit to analyze or process. types (str): The types to analyze or process. api_key (str): The api key to analyze or process.

Behavioral Transparency: - Side Effects: This tool is read-only and produces no side effects. It does not modify any external state, databases, or files. All output is computed in-memory and returned directly to the caller. - Authentication: No authentication required for basic usage. Pro/Enterprise tiers require a valid MEOK API key passed via the MEOK_API_KEY environment variable. - Rate Limits: Free tier: 10 calls/day. Pro tier: unlimited. Rate limit headers are included in responses (X-RateLimit-Remaining, X-RateLimit-Reset). - Error Handling: Returns structured error objects with 'error' key on failure. Never raises unhandled exceptions. Invalid inputs return descriptive validation errors. - Idempotency: Fully idempotent — calling with the same inputs always produces the same output. Safe to retry on timeout or transient failure. - Data Privacy: No input data is stored, logged, or transmitted to external services. All processing happens locally within the MCP server process.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
limitNo
typesNopublic_channel
api_keyNo
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The 'Behavioral Transparency' section includes details on side effects, authentication, rate limits, error handling, and idempotency, which is informative. However, the content is largely generic (e.g., mentions 'MEOK API key') and may not accurately reflect Slack channel behavior, reducing relevance.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness2/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is lengthy, redundant (e.g., 'Behavior' and 'Behavioral Transparency' overlap), and includes irrelevant generic boilerplate. It is not concise and lacks clear structure focused on the tool's specific purpose.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The description omits essential details like what the tool returns (e.g., member counts, topics) and how to use it in Slack context. Despite good annotations coverage, the generic text fails to provide a complete and accurate picture for this specific tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The 'Args' section provides generic descriptions ('The limit to analyze or process') that add no meaningful context beyond the schema. Schema coverage is 0%, so the description fails to clarify what the parameters (limit, types, api_key) actually represent for listing channels.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The first sentence clearly states the tool lists Slack channels with member counts and topics, providing a specific verb and resource. However, subsequent generic text (about 'analysis output', 'classification') dilutes clarity and does not differentiate from siblings like create_channel or get_audit_log.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The 'When to use' and 'When NOT to use' sections are generic and irrelevant to listing Slack channels. They do not guide the agent on when to choose this tool over siblings (e.g., search_messages, get_thread) or provide context-specific usage.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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