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

Annotations only declare openWorldHint and idempotentHint, so the description carries most of the behavioral burden. It discloses the concrete effect on order state (payment status becomes "no payment") and implies idempotence, but says nothing about reversibility, permissions, or auth requirements for a mutation.

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?

Front-loaded and short, but the second sentence ("Sets its payment status to 'no payment'") largely restates the first, and a stray artifact ("[#23c7f4]") is appended with no meaning. Both are wasted tokens against an otherwise tight definition.

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 simple status-setting mutation with no output schema, the description covers what it does and when to use it, which is mostly sufficient. However, it omits whether the marking can be undone and any permission requirements, leaving gaps an agent might hit.

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 100%, so order_uuid and workspace are already fully documented in the schema. The description adds no syntax, format, or sourcing detail beyond that, so the baseline 3 applies.

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+resource (mark an order) and the exact state transition (payment status set to "no payment"), with concrete examples (free/comp/sample). This clearly distinguishes it from siblings like record_order_payment or set_order_payment_method without needing to open their schemas.

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 when-to-use condition: "Use when an order should proceed without a recorded payment." It does not name explicit alternatives (e.g. record_order_payment) or state when-not to use it, so it falls short of a 5.

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