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

Since no annotations are provided, the description must convey behavioral traits. It states that it 'Returns a plain-text overview,' implying a read-only operation with no side effects. It could be more explicit about requiring no authentication or state changes, but the description is transparent enough for a simple retrieval tool.

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 extremely concise with two sentences, front-loading the purpose and usage guidance. Every sentence adds value: first defines the tool, second provides when-to-use context and output format.

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?

Given the tool has no parameters and no output schema, the description is complete. It specifies the purpose, usage context, and return type (plain-text overview of verification pipeline, token types, settlement model). No further information is needed.

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 input schema is empty with no parameters, and schema description coverage is 100%. According to guidelines, baseline is 4 for 0 parameters. The description does not add parameter semantics because none exist.

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 tool's purpose: 'Get a concise explanation of what Crinkl is and how the protocol works.' It uses a specific verb ('Get') and resource ('explanation of the protocol'), and distinguishes it from sibling tools like get-merchant-summary or get-gmv-inclusion-proof by focusing on protocol overview.

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 explicitly says 'Use this first if you have no prior context about Crinkl,' providing a clear when-to-use guideline. However, it does not mention when not to use it or name alternative tools, though the context of being a first-step overview is sufficient.

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