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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds value beyond that by disclosing the shape of the return data ('default cost and wage'), which matters because there is no output schema, and by noting the underlying GET /services endpoint.

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 short sentences, front-loaded with the resource and its meaning; every clause carries information. The trailing 'GET /services' is largely redundant with the tool name and adds little for an agent, keeping it short of 5.

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 read-only list tool with annotations covering safety, a fully documented schema, and no output schema, this covers the essentials and even names the returned fields. It omits only pagination/response-shape detail that an agent might want for large catalogs.

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?

Schema description coverage is 100%, so all four parameters (name, page, per_page, direction) are already documented with defaults and bounds in the schema. The description adds no filtering, pagination, or sorting semantics beyond that, making the baseline 3 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?

States a specific verb+resource ('List services') and clarifies the domain term by equating services with lesson types like 'Math Tutoring', plus what each record contains (default cost and wage). It is clearly distinct from siblings such as list_lessons or list_subjects, though it never explicitly contrasts with 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?

Usage is implied by the verb and resource — an agent can infer this is the tool for enumerating the service catalog — but there is no explicit when-to-use, when-not, or pointer to an alternative (e.g., for fetching one service or filtering lessons by type).

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