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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. Beyond enumerating return fields (which the output schema already provides), the description discloses no behavioral traits such as error handling for an invalid id or rate limits.

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?

One sentence, front-loaded with the resource, and no padding. It is efficient, though the trailing field enumeration largely duplicates the output schema.

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 1-parameter read tool with an output schema present, the description needn't explain returns, yet it spends its text doing exactly that. The gap is the unexplained 'id' input, so the definition is only adequate.

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 a single parameter at 0% schema description coverage, the description carries the full burden for the 'id' argument, yet it never explains the id's format, source, or constraints. The field list describes output, not the input.

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 a specific resource ('a single Pinterest pin') and scope ('full detail'), so an agent can tell it fetches one pin rather than a list. It never differentiates itself from siblings like pinterest_search or pinterest_idea, and it is phrased as a noun phrase rather than an action verb.

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?

There is no explicit when-to-use guidance, no prerequisite for how to obtain the pin id, and no mention of alternatives such as pinterest_search or pinterest_user_pins. Usage is only inferable from the name.

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