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

Annotations already cover the safety profile (readOnly, not destructive). The description adds the useful context that this is a legacy alias and that the return format differs from fetch, but it does not specify what that format actually is, which is a notable but not severe omission.

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 compact and front-loaded with the key facts: legacy status, purpose, and the instruction to use fetch. The phrase 'returned form is different' is vague, but every sentence otherwise earns its place and there is no padding.

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 one-parameter read-only tool with safety annotations, most needed context is present. However, since there is no output schema and the description explicitly highlights a different return shape without explaining it, an agent cannot fully anticipate the response structure, leaving a real gap.

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 sole parameter, url, is already fully documented in the schema with 100% coverage, including that Japanese paths are allowed. The description adds no additional parameter-level meaning, so the schema carries the burden and baseline 3 is appropriate.

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 identifies the tool as a legacy version of fetch that returns page contents, and it names fetch as the current equivalent. It distinguishes the tool from its siblings by pointing to the different return shape, though the exact difference is left unspecified.

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 explicitly says this tool exists for people already connected and instructs new users to use fetch instead. This is direct when-to-use / when-not-to-use guidance with the named alternative, so an agent can decide correctly without further research.

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