download_file

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

With no annotations provided, the description must convey behavioral traits. It discloses that local_path is relative to the download root and mentions the default location. However, it does not state whether files are overwritten, access requirements, error handling, or performance characteristics. Basic behavior is covered, but important details are missing.

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 extremely concise with two sentences and no extraneous words. It front-loads the core action ('Download a remote file') and immediately clarifies the destination and path semantics. Every sentence serves a purpose.

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?

Given the absence of an output schema, the description should clarify what the tool returns upon completion. It does not mention return values, success indications, or the local path of the downloaded file. For a file download operation, this is a notable gap, though the overall simplicity of the tool may mitigate the impact.

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?

Schema coverage is 100%, so parameter descriptions already exist. The description adds value by noting that 'local_path is relative to that root' and explains that empty or directory-like values keep the remote filename. This extends the schema for local_path but overall provides only marginal improvement over the schema's own descriptions.

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 verb 'download' and identifies the resource as 'a remote file'. It specifies the destination as 'the configured download root (default local app data)', which differentiates it from sibling tools like get_download_url (which only retrieves a URL) and upload_file. The action is 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 for downloading files but provides no explicit guidance on when to use this tool versus alternatives like get_download_url or when not to use it. There are no mentions of prerequisites or disclaimers, leaving the agent to infer the appropriate context.

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