blackboard_download_file_url

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions saving to disk and the default output directory but does not disclose return values, behavior if files exist, or error handling. The read-only nature is implied by the tool name but not explicitly stated.

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 concise, using two short sentences to convey the core action and default behavior. Every word earns its place, with no unnecessary detail.

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 covers the main action and default directory but omits information about return values and how the optional filename parameter behaves when absent. Given the lack of an output schema, this is a notable gap for an agent that needs to know what the tool returns or how the file is named.

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 provides 100% parameter coverage, with each parameter described. The tool description adds minimal new semantic information, only restating the default output directory. This aligns with the baseline for high schema coverage.

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 clearly states the tool downloads a file directly from a Blackboard bbcswebdav URL and saves it to disk, using a specific verb and resource. It distinguishes from sibling download tools by emphasizing the direct URL mechanism, making its purpose unambiguous.

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 implies usage when a direct bbcswebdav URL is available but does not explicitly state when to use this tool over alternatives like blackboard_download_attachment or blackboard_download_feedback_file. It lacks clear exclusions or alternative guidance.

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