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

Annotations already declare readOnlyHint=true, and the description adds valuable behavioral context by enumerating what the tool never does (quotes, signs, settles, transfers rights, exposes protected payloads, performs payment). It also clarifies the boundary between discovery and buyer actions, going beyond the annotation. No contradiction with annotations.

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 two sentences with no filler. The main purpose is front-loaded, and the exclusion list and buyer-action pointer are concise. Every word earns its place.

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?

While the tool is simple (0 params, readOnly annotation), the description does not detail the structure of the returned metadata. It mentions 'public-safe metadata' and that buyer actions are returned, but an agent may not know what fields to expect. Since there is no output schema, this gap is notable, though not critical for a discovery list.

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?

With zero parameters, the schema is trivially fully covered. The description does not need to explain parameters, and it does not. Baseline for 0-param tools is 4, and no additional semantic value is required or provided.

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 states the verb 'List' and the resource 'public-safe metadata for live SaSame Information paid-access listings.' It is specific and distinguishes the tool from siblings by focusing on the public-safe, read-only metadata aspect, making it easy to identify its purpose without ambiguity.

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 provides clear context for when to use the tool (read/discovery only) and explicitly states that buyer actions remain on the authenticated User MCP action surface, implying that alternative tools handle those actions. However, it does not name specific sibling tools as alternatives, so it stops short of fully explicit routing.

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