slack_files_get_upload_url_external

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

The annotations carry the full safety profile (readOnlyHint=false, destructiveHint=true, idempotentHint=true), and the description adds almost no behavioral disclosure beyond them. It fails to explain the non-obvious destructiveHint on what is nominally a 'get' operation, nor does it disclose what the call returns or what side effects may occur on the Slack side. The routing note is about authority, not tool behavior.

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

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

The argument list is compact and well-structured, and the routing sentence earns its place. But the opening line wastes space by restating the tool name and platform path that the agent already knows, and it is placed ahead of the more informative content. Acceptable but not tight.

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

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

The description thoroughly documents governance plumbing (project_id, connector_account_ref, approval_ref, effect) but omits the operation's core role: it is the first step of Slack's two-step external upload flow and should be followed by `slack_files_complete_upload_external`. It also never says what the returned URL is for or what the `arguments` JSON must contain. For a 7-parameter tool with an unusual destructive annotation and no required params, these are significant gaps.

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

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

With 0% schema description coverage, the per-parameter list does add real meaning: 'JSON string of arguments', 'Authenticated Project UUID', 'Claimed read or write effect; Spring verifies it', and 'Approved platform task UUID when resuming a write' all go beyond the bare schema titles. However, the critical `arguments` field — the actual Slack API payload — remains opaque with no hint of required keys (e.g., filename, length), so an agent still cannot construct a correct invocation from this definition alone.

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

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

The opening sentence merely restates the tool name: 'Slack connector operation `files_get_upload_url_external` (platform tool `slack.files_get_upload_url_external`)'. The text never states what the operation actually does — obtain a URL for uploading a file externally to Slack. It also provides no differentiation from the natural sibling `slack_files_complete_upload_external`, which completes the paired upload flow. The function must be inferred entirely from the name.

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

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

There is no guidance on when to select this tool versus alternatives. The sole contextual sentence, 'Routes only through the exact project/account governed connector authority,' is an authorization constraint, not a usage criterion. The description never mentions the complementary `slack_files_complete_upload_external` step or any scenario that would prompt an agent to invoke this operation.

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