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

Annotations already declare readOnly/idempotent/non-destructive, and the description adds behavior beyond them: it never raises a protocol error, instead returning {"error": ...} with corrective text, and states retries after fixing input are always safe. It also discloses the premium/license gating and the concrete return shape, which annotations cannot convey.

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?

Front-loaded with the core action and the example payloads are compact and useful. The third sentence ('Returns persona plus every skill for one product') restates the opening line, a minor redundancy that costs a bit of tightness.

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?

An output schema exists, so return values needn't be re-explained, yet the description still shows a representative response. Combined with license gating, error contract, and retry safety, an agent has everything needed to invoke and recover from failures correctly.

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% and the slug property already documents 'exactly as returned by list_products'. The description reinforces this with a literal example input and ties the parameter to error semantics ('unknown slug'), which adds a little beyond the schema but is not essential new meaning.

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 ('Load one product in full: its persona plus every paid skill') and names exactly what is included. It also distinguishes itself from the three relevant siblings (get_full_skill, list_products, get_free_skill) so an agent can select it without inspecting schemas.

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 gives the selection condition ('Use when the caller wants the whole product') and names the alternatives for the adjacent cases: single skill via get_full_skill, free look via list_products/get_free_skill. Includes the PREMIUM (license) prerequisite, which is real usage guidance.

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