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 the safety profile is fully covered by structured data. The description adds that pricing is 'one-time' in two currencies, which is useful context, but says nothing about failure behavior for a bad slug or whether data is cached/live. Against an annotated read-only tool, a 3 is appropriate.

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?

One tightly packed sentence with no filler; the resource and returned fields are front-loaded and the sourcing constraint appears at the end where it reads naturally.

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?

No output schema exists, so the description's enumeration of returned fields (description, link, category, dual-currency price) carries real weight and tells the agent what to expect. It is nearly complete for a trivial single-parameter lookup; only error behavior for an unknown slug is unaddressed.

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% and the single slug parameter is documented in-schema with an example ('apt-numerical-graduate'), so the schema does the heavy lifting. The description only restates that the slug originates from search_assessments, adding marginal value beyond the schema's own note. Baseline 3 applies.

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 gives a specific verb (retrieve one assessment) plus the exact fields returned: description, link, category, and one-time INR/USD price. It also distinguishes itself from the sibling search_assessments by identifying that tool as the source of the slug, so an agent can tell 'search many' from 'fetch one' without opening either schema.

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?

It states the workflow dependency clearly: the slug must come from search_assessments, which implies search first, then fetch details. It does not spell out when NOT to use it (e.g., for practice tests or guides, which are separate siblings) or what to do with an invalid slug, so it stops short of full explicit guidance.

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