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

Annotations already declare readOnlyHint=true and openWorldHint=false, consistent with the description's read-only framing. The description adds useful domain context — testnet mints are free and are not counted against the plan — but says nothing about scoping, staleness of 'this period', or what happens when no plan exists.

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?

Two short sentences, front-loaded with the core resource and then the returned metrics, followed by a single clarifying caveat about testnet. No filler, though the phrasing is dense enough to read as a fragment rather than a grammatical description.

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 no output schema, the description carries the burden of describing the return payload, and it does so by listing the four components an agent will receive. The only gap is the absence of any note on what a missing plan or non-holder owner yields.

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 takes zero parameters with 100% schema coverage, so there is nothing for the description to disambiguate. Baseline 4 applies; the description correctly signals the implicit subject (the link owner) rather than asking for an id.

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 names the specific resource ('the link owner's soulbound plan') and enumerates the returned quantities: confirmed mainnet mints this period, overage, and Floor Feeders holder pricing. It is clearly distinct from siblings like my_soulbound_collections or list_pending_soulbound, though it never names a sibling explicitly.

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?

Usage is only implied through the 'my_' naming convention and the reference to 'the link owner', which suggests a self-scoped lookup. There is no explicit statement of when to call this versus my_soulbound_collections or verify_soulbound_holder, and no prerequisites are described.

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