blackboard_download_file_url

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

Annotations already disclose readOnlyHint=false and openWorldHint=true. The description adds the destination directory context, but lacks behavioral details such as overwrite behavior, download size limits, or authentication requirements. It provides some transparency beyond annotations but not rich context, earning a mid-range score.

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 description is a single, well-structured sentence that front-loads the action and key resource details. Every word earns its place, with no redundancy or irrelevant information.

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?

For a relatively simple download operation, the description covers the core purpose adequately, supported by a complete schema and annotations. It lacks explicit mention of return values or error behavior, but those are not critical given the tool's simplicity. The absence of output schema is partially mitigated by the clarity of the action.

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?

The input schema has 100% coverage with clear descriptions for all three parameters (url, filename, outputDir). The description does not add significant meaning beyond the schema; it only implies the destination directory, which the schema already covers via outputDir's description. Baseline of 3 is appropriate.

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 description uses the specific verb 'Download' and identifies a precise resource ('Blackboard bbcswebdav file') and destination ('protected Campus download directory'), which clearly distinguishes it from sibling download tools like blackboard_download_attachment and blackboard_download_feedback_file. The name itself ('download_file_url') reinforces the unique purpose.

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?

The description provides no guidance on when to use this tool versus alternatives such as blackboard_download_attachment. It does not state prerequisites, exclusions, or specific scenarios, leaving the agent to infer usage solely from the schema and name.

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