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

Annotations already cover read-only and idempotent behavior, but the description adds important context: the tool never raises a protocol error and instead returns an error object with a fix message. This disclosure goes beyond the annotations and is valuable for safe invocation.

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 well-structured, front-loaded with the core purpose, includes a concrete example, lists alternatives, and details error behavior. Every sentence adds value with no redundancy, achieving high conciseness.

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?

Given the presence of an output schema, the description does not need to detail return format. It covers error handling, licensing context (PREMIUM), and retry safety. Minor gap: no explicit mention that the skill must be paid, but that is clear from the initial sentence.

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 coverage is 100%, so baseline is 3. The description provides an example of input and output, but does not add substantial meaning beyond the schema's own documentation (which already ties slug to list_products and skill_name to the skills array). The example reinforces usage but does not elevate the score.

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 it loads one paid skill's complete instructions from a product. It specifies the verb 'Load' and the resource type, and distinguishes itself from sibling tools like get_free_skill and get_full_product by explicitly naming 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?

The description says 'Use when the caller wants one specific paid skill' and explicitly excludes use cases for the free gateway skill and retrieving all skills at once, naming alternatives. However, it does not mention any prerequisites like needing to call list_products first, though the schema descriptions imply that.

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