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karbassi

slack-mcp

by karbassi

files_shared_public_url

Enable external sharing of a Slack file by generating a public URL.

Instructions

Enable a file for public/external sharing.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
fileYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior2/5

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

With no annotations provided, the description must fully disclose behavioral traits. It only states the basic function; it does not mention side effects (e.g., URL generation), permissions needed, reversibility, or whether the action is idempotent. For a mutation tool, this is insufficient.

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

Conciseness4/5

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

The description is a single sentence with no unnecessary words, achieving high conciseness. However, the brevity sacrifices valuable detail; a slightly longer, structured description (e.g., explaining the file parameter) would improve clarity without significant bloat.

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?

Given the tool's simplicity (one required parameter) and the presence of an output schema, the description should explain what the tool returns (e.g., a new sharing URL) and any constraints. It omits these details, leaving the agent with incomplete context for correct invocation.

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 input schema has 1 parameter ('file') with 0% description coverage. The description does not clarify the expected format (e.g., file ID, path) or provide any context for the parameter. Since schema coverage is low, the description was expected to compensate but fails to add meaningful semantics.

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

Purpose5/5

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

The description 'Enable a file for public/external sharing' uses a specific verb ('enable') and clearly identifies the resource ('file') and action ('public/external sharing'). It is distinct from siblings like 'files_revoke_public_url' which performs the opposite action, making purpose unambiguous.

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 description provides no guidance on when to use this tool versus alternatives (e.g., files_revoke_public_url, files_upload). It lacks prerequisites, such as the file being already uploaded or ownership requirements, leaving the agent without context for appropriate 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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