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

The description adds behavioral details beyond the 'destructiveHint: true' annotation: it specifies that the operation is additive (non-destructive in terms of existing data), uses a specific API host and public key, and returns responses for async polling. This is sufficient context for an agent to understand the tool's 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 description is concise with three sentences, each providing distinct value: the action, the technical detail (API host/public key), and the return format. No unnecessary words are present, making it efficient.

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 no output schema, the description adequately explains the return format (token or file info) and the need for async polling. It covers the main use case but lacks details on error handling, file size limits, or supported URL types. Overall, it is sufficiently complete for a tool with good schema annotations.

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 already provides 100% coverage with descriptions for all three parameters. The tool description does not add additional meaning beyond what the schema contains, so it meets the baseline without surpassing it.

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 'uploads', the resource 'file into the project', and the source 'from a public URL'. It uniquely identifies this tool among siblings as the only upload tool, so there is no confusion with alternatives.

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 indicates the tool should be used when you have a public URL to ingest into the project. However, it does not provide explicit guidance on when not to use it or how it compares to other tools, though no direct alternatives exist in the sibling list.

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