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

With no annotations, the description carries the full burden and does well: it flags DESTRUCTIVE in caps and spells out the consequence (both transactions will no longer be marked as refund-linked). It omits whether the operation is reversible or what permissions are required, which keeps it short of a 5.

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?

Three tight sentences, front-loaded with the action, then the destructive consequence, then the parameter precondition. No filler and nothing buried.

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 two-parameter mutation tool with no annotations and no output schema, the description covers purpose, consequence, and preconditions adequately. It lacks permission requirements and reversibility, but nothing essential to correct invocation is missing.

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 both UUID parameters and their nullability are already documented in the schema. The description adds only the precondition that the two must have been linked previously, which is slightly useful but mostly restates schema-level meaning — baseline 3 is appropriate.

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?

States a specific verb ('Remove') and resource ('the refund link between two transactions'), and the resource is distinct from the sibling link_refund. An agent can immediately tell this is the inverse operation of link_refund.

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?

Gives a clear precondition — both transactions 'previously linked' — which tells the agent when this is applicable. It does not explicitly name link_refund as the alternative for creating the link, but the inverse relationship is obvious from the operation name and stated precondition.

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