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

Beyond annotations (readOnlyHint=false, openWorldHint=true, destructiveHint=false) it discloses the funnel cascade side effect (approving the main product approves upsells/downsells), the confirmation requirement, the reach-other-people warning, and the Cotlet API key auth need. This is rich behavioral context the annotations do not carry.

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?

Purpose is front-loaded and the operational warnings follow. Minor redundancy between 'Approve or reject a pending affiliate application' and 'Approves or rejects an affiliate for the products you name' costs a point.

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 mutation tool with no output schema, the description covers prerequisites, cascade side effects, confirmation, and auth. Return values are not described, but no output schema exists so that is not a 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?

Schema coverage is 100%, so all four parameters are already documented, including the decision enum and the affiliate_id source. The description adds the funnel-cascade meaning of product_ids but nothing about trigger_emails or format details, so baseline 3 is correct.

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 states a specific verb pair (approve/reject) and resource (pending affiliate application) plus the scope (one or more products). An agent can immediately distinguish it from thrivecart_list_affiliates and other ThriveCart siblings.

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 gives real prerequisites ('Approving needs a pending application for each of them') and confirmation guidance ('By default you confirm each call... confirm with the user before each call'). It stops short of explicitly routing to thrivecart_list_affiliates as the source of affiliate_id, though the schema covers that.

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