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

Annotations already provide readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so safety is disclosed. The description adds useful behavioral context about checking receipt limits and record availability, but it doesn't go beyond that. No contradiction with annotations, but the extra context is modest.

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?

The description is two sentences: the first states the action, the second states when to use it. It's efficient and front-loaded, with no filler or repetition. It could arguably be one sentence, but the current structure is clear and concise.

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 zero-parameter tool with robust annotations, the description is complete. It explains the purpose and usage conditions. No output schema exists, so return format is not expected. The mention of checking record availability and receipt limits covers all stated functionality.

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 has zero parameters, so the schema fully covers parameter semantics. The description doesn't need to add parameter details. Per the rubric, a baseline of 4 applies for zero-parameter tools.

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's function: 'start BoxTier login or check current connected account and receipt generation limit policy.' It also specifies when to use it, which effectively distinguishes it from siblings like create_basketball_receipt and list_my_match_records. The verb-resource pairing is specific and 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?

It explicitly says to use when 'the user asks about login, account connection, my records availability, or receipt limit.' This gives clear when-to-use guidance. However, it doesn't mention alternatives or when not to use, but given the tool's narrow scope, this is acceptable.

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