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

With no annotations, the description carries the burden of behavioral disclosure. It reveals a key side effect (one-time 100 trial-unit grant) and a prerequisite, but does not explain idempotency behavior despite the idempotencyKey parameter, repeated-enrollment effects, or failure cases.

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?

Two short sentences, front-loaded with the action and outcome, with no filler. Every phrase contributes: the grant amount, the one-time nature, and the prerequisites.

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 simple one-parameter tool with no output schema, the description covers purpose, outcome, and prerequisite. However, it leaves the idempotencyKey semantics unexplained and omits return/error behavior, which matters for a mutation tool with no annotation support.

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 0% and the description never mentions idempotencyKey. The parameter name is self-explanatory and the required flag is visible in the schema, but the description adds no explicit meaning and only weakly hints at idempotency via 'one-time.'

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 and resource: 'enroll in internal credits,' and adds a concrete outcome (one-time 100 trial-unit grant). It is clearly distinct from the listed siblings, though 'internal credits' remains somewhat undefined.

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 a prerequisite ('Requires credits activation and scope') that implies when this tool is appropriate, but does not explicitly mention when not to use it or name any alternative. The usage context is clear but not fully elaborated.

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