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

With no annotations provided, the description carries the full burden of behavioral disclosure. It states 'Read-only,' describes the privacy property that 'the server cannot link to any payment,' and promises 'honest what-we-learn / what-we-do-not.' This is solid coverage for a zero-parameter info tool, though it omits details like authentication requirements or data freshness.

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 four sentences and information-dense, front-loading the core definition of Plus before covering payment, redemption, and return values. It is efficient overall, though the phrase 'honest what-we-learn / what-we-do-not' is slightly vague and could be tightened.

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?

There is no output schema, so the description must explain return values. It lists products, assets, and the mint public key, but the title promises 'prices' and the description only mentions payment methods, not an explicit price return. The 'honest what-we-learn / what-we-do-not' clause is also underspecified, leaving some ambiguity about the actual response shape.

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 has zero parameters and an empty schema, so there is no parameter burden for the description to carry. The description instead adds value by explaining what the tool returns, which is the appropriate focus for a no-input info endpoint.

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 clearly defines the tool as an info endpoint for Plus: it 'Returns products, assets, the mint public key (JWK)' and explicitly states 'Read-only.' It also distinguishes itself from sibling tools by clarifying what Plus is not ('never a "more private lane"') and by listing the specific product categories.

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 gives clear context for when to use this tool: to learn about Plus offerings, payment methods, and redemption mechanics. It does not explicitly name alternatives or exclusion criteria, but the context strongly implies this is the informational precursor to tools like robyn_plus_claim or robyn_plus_invoice.

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