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

The description discloses the core behavior (create a package) which aligns with annotations (readOnlyHint=false, destructiveHint=false). It adds a usage hint but does not elaborate on side effects, permissions, or error conditions. Given annotations cover the basic traits, the description adds moderate value.

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 sentences with no extraneous information. The first sentence states the purpose, the second provides a key usage tip. Front-loaded and efficient.

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 tool has 8 parameters, 4 required, and an output schema, the description is brief. It explains the concept of a prepaid session bundle and the applicableType mechanism, but lacks detail on how sessionCount and validDays interact or default behaviors. Adequate but not comprehensive.

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 adds context specifically for applicableType and applicableItems, clarifying their use together. Other parameters (name, price, sessionCount, etc.) are already described in schema, so overall the description provides limited additional 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?

The description clearly states the tool creates a 'service package/prepaid session bundle', providing a specific verb and resource. It distinguishes from sibling create tools by specifying the type, and includes a usage hint about applicableType, making the purpose unambiguous.

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 gives a specific tip about when to use applicableType=SELECTED, but does not explicitly guide when to use this tool versus alternatives like list_service_packages or update_service_package. Usage context is implied but not directly stated, earning a mid-range score.

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