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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so safety is fully covered and the description need not restate it. The description adds value the annotations cannot: it enumerates the returned fields (id, title, audience, number of steps), which matters because there is no output schema. It does not address ordering or empty-result behavior, keeping it from a 5.

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?

A single sentence with the resource name first and the concept definition immediately after, followed by the returned fields. Every clause earns its place — nothing is repeated from the title or annotations.

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 zero-parameter, read-only list tool with rich annotations and no output schema, the description covers purpose, the domain concept, and the return shape — everything an agent needs to select and call it. Only result ordering and the empty-list case are unaddressed, which is minor at this complexity.

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 tool takes zero parameters, so per the baseline this starts at 4. The description does not invent pseudo-parameters or filtering options that don't exist, which would have been misleading.

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 (Lists) and resource (skill bundles) and goes further by defining what a bundle actually is: 'ordered paths where each skill's output is the next skill's input.' That definition lets an agent distinguish bundles from skills without opening sibling schemas. It stops short of explicitly naming get_bundle or list_skills as the alternative, so a 4 rather than 5.

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 only implied by the verb 'Lists' — the agent can infer this is the enumeration entry point and that get_bundle retrieves a single one. There is no explicit when-to-use or when-not statement, and no mention of whether any filtering is possible (none is, given zero parameters).

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