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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered; 'Read only' merely restates it. The description does add value by disclosing that results include pricing and per-plan student counts rather than bare plan records, but says nothing about ordering or volume of results.

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 front-loaded sentence carries the resource and its returned fields, with no filler. The trailing 'Read only.' is pure redundancy against the readOnlyHint annotation and is the only wasted token.

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?

With no output schema, the description carries the burden of describing returns and does so by naming price, period, classes and student counts. For a zero-parameter read tool with full annotation coverage, that is nearly enough; result ordering or whether inactive plans are included would be the only remaining gap.

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 there is nothing for the description to disambiguate and the baseline is 4. No parameters are misdescribed or left ambiguous.

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 resource (the plans/contracts the trainer sells) and enumerates the payload fields (price, period, classes, student counts), which tells an agent exactly what it gets back. It does not, however, distinguish itself from plausible near-neighbors such as list_subscriptions or list_programs, which an agent browsing these siblings could easily confuse.

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 name and the phrase 'the plans/contracts the trainer sells' imply the read-catalog use case, but there is no explicit when-to-use statement, no exclusion of alternatives like list_subscriptions, and no prerequisite mentioned. Usage is inferable rather than guidance.

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