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karbassi

slack-mcp

by karbassi

files_remote_add

Add a remote file from an external URL to Slack, indexed by a unique ID, with optional searchable text and preview image.

Instructions

Add a remote file.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
titleYesTitle of the file shown in Slack.
filetypeNoFile type identifier (e.g. ``doc``, ``pdf``).
external_idYesUnique identifier for the file in your app's storage (e.g. ``123abc``).
external_urlYesURL where the remote file can be accessed (e.g. ``https://example.com/files/123``).
preview_imageNoImage to use as the file's preview thumbnail.
indexable_file_contentsNoPlain-text contents of the file used to make it searchable in Slack.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior2/5

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

No annotations provided. The description does not disclose that this is a write/mutation operation, any auth requirements, or side effects. It is too brief to be informative.

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?

Single sentence is concise and efficient, but it is so brief that it lacks structure. Still, no waste.

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?

Despite having an output schema, the description is too minimal given 6 parameters and many sibling tools. It does not guide an agent on how to construct the call or when to use it.

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

Parameters3/5

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

Schema coverage is 100% so the schema already documents all 6 parameters. The description adds no additional parameter meaning beyond what the schema provides, meeting the baseline.

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 'Add a remote file.' is a specific verb+resource that clearly distinguishes from siblings like files_upload (local upload), files_remote_info, files_remote_list, etc.

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?

No guidance on when to use this tool versus alternatives like files_upload or files_remote_share. With many file-related siblings, an agent lacks decision criteria.

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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