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

With no annotations, the description carries the burden of behavioral disclosure. It reveals the return content and receipt fields, but omits important traits such as network/fetch semantics, error handling, authentication needs, rate limits, or side effects. It is not misleading, but incomplete.

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, front-loaded sentence with no redundant words. It efficiently conveys the core functionality and output.

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 simple two-parameter tool, the description covers the basic function and output sketch, but without an output schema or behavioral details (e.g., what the signed receipt looks like, when content is omitted), an agent may not be fully equipped to invoke it correctly in all scenarios. It is adequate, but not comprehensive.

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 describes 'url' but not 'include_content'. The description mentions returning 'content' and 'content hash', which indirectly relates to content handling, but does not explicitly explain the meaning or effect of include_content. It adds some context but does not fully compensate for missing parameter details.

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 ('Fetch a URL') and the unique output ('a signed receipt binding url, status, content hash and time'), making it distinct from sibling tools. The verb+resource pairing is specific and 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 use for obtaining an attested (signed) fetch, but it does not explicitly state when to use this versus alternatives or provide exclusions. Sibling tools like notarize or publish_page could overlap conceptually, but no differentiation is offered.

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