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

Annotations already declare read-only, idempotent, non-destructive, closed-world behavior. The description adds meaningful context beyond that: no account or upload is needed, all numbers are fictional and fixed, there is no relationship diagnosis, and output is text plus structured recap without image export.

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 front-loaded and dense with useful constraints: fictional-only scope, no private data, fixed numbers, and return format. It is slightly title-like at the start, but every remaining clause carries decision-relevant information.

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, read-only, one-parameter demo tool with an output schema, the description covers safety, scope, and return shape well. The only notable omission is locale behavior, which matters because the parameter exists and its effect on the recap language is unstated.

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 schema has only one optional locale parameter, but the description never mentions locale or explains that it controls the language of the fictional recap. With 0% schema description coverage, the description should compensate here but does not.

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 states a specific verb and resource (Show a synthetic WhatsApp recap) and clearly scopes it as fictional demo content. It distinguishes itself from the real-conversation sibling tools by ruling out account access, uploads, and private conversation data.

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?

It gives an explicit use case (demo or example only) and an explicit prohibition (never to answer questions about the user's real conversation). This is enough routing guidance for an agent to know when not to call the real-data siblings instead.

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