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

readOnlyHint and openWorldHint already declare the safety profile, and the output schema covers return shape, so the description's job is lighter. It adds that the payload is a JSON Schema plus metadata and that this is a pre-invocation lookup step, which is useful framing beyond the annotations. It does not say what happens when the name is unknown or invalid.

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?

Two sentences with no filler: the first defines the action and return payload, the second defines the sequencing. Front-loaded and easy to scan.

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?

With an output schema published, the description need not explain return values, and it correctly limits itself to purpose and ordering. The remaining gap is failure handling for an unrecognized tool name, which an agent may need to know before calling.

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 single 'name' parameter has 0% schema description coverage, so the description has to carry it. 'By name' implies the value is a tool identifier, but it does not specify whether it must match exactly, be case-sensitive, or come from list_all_tools output versus search_tools results.

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?

States a specific verb and resource ('fetch the JSON Schema and metadata for a single tool by name'), which clearly separates it from the call_* siblings that execute operations and from list_all_tools/search_tools that discover them.

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?

Explicitly positions the tool in a workflow ('use this after list_all_tools when you've picked a tool and need its input schema before calling it'), giving a clear trigger condition. It does not mention search_tools as an alternative discovery path, so it stops short of full alternative routing.

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