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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the read-only nature is covered. The description adds useful behavioral context by listing supported actions with their expected parameters and by disclosing bulk support for batched execution. It does not contradict the annotations.

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 compact and front-loaded with the resource and read-only nature. The action enumeration and bulk-support note are concise. The phrase '[Flattened action: transactions]' is jargon that adds little clarity, but overall there is no wasteful filler.

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 four parameters, no output schema, and no descriptions in the input schema, the description is not complete enough for confident invocation. It lacks return-value behavior, account parameter semantics, pagination details beyond 'cursor', and any mention of how this tool relates to sibling coupon/transaction tools.

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%, so the description must compensate. It partially does by mapping cursor to list, id to get/audits/transactions, and ids to bulk execution. However, it completely omits the 'account' parameter and provides no types or constraints beyond these implicit mappings, leaving a significant semantic gap.

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 identifies the resource (Guru coupons) and the read-only nature, and lists possible actions including transactions, but it does not explicitly define what the core 'transactions' action does beyond the tool name. The enumeration of multiple actions (list, get, audits, transactions) makes the specific purpose less crisp than a single verb+resource statement.

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 provides an internal action-to-parameter mapping (list uses cursor; get/audits/transactions use id) and mentions batch support with ids, but it gives no guidance on when to use this tool versus alternatives like guru_coupons_get, guru_coupons_audits, or guru_transactions_get. There are no exclusions or preferred use-case statements.

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