download_file

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 the return format ('base64-encoded content'), which is useful, but fails to address critical aspects like authentication requirements, error handling (e.g., for invalid URLs), file size limits, or performance implications. This leaves significant gaps for a download operation.

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 that directly state the action and return value, with zero wasted words. It is front-loaded and efficiently communicates the core functionality without unnecessary elaboration.

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 complexity of a file download operation with no annotations and no output schema, the description is incomplete. It lacks details on authentication, error cases, rate limits, or what the base64 output entails (e.g., encoding specifics). For a tool that interacts with external systems and returns data, this is inadequate.

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 schema description coverage is 100%, with the parameter 'serverRelativeUrl' fully documented in the schema. The description adds no additional parameter information beyond what the schema provides, such as format examples or constraints, so it meets the baseline for high schema coverage without compensating further.

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 action ('Download a file') and resource ('from SharePoint'), making the purpose immediately understandable. However, it doesn't differentiate from sibling tools like 'list_files' or 'upload_file' beyond the basic verb, missing explicit sibling distinction.

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?

No guidance is provided on when to use this tool versus alternatives like 'list_files' for browsing or 'upload_file' for the opposite operation. The description lacks context about prerequisites, such as needing a file URL from another tool, or exclusions for when not to use it.

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