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

Annotations already declare readOnlyHint and idempotentHint, and the description adds useful behavioral context: without an argument it returns a list, with a slug it presumably returns the corresponding guide. No contradiction with annotations, and no destructive behavior is implied.

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?

Two concise sentences communicate both the tool's purpose and its no-argument behavior. There is no redundant or filler content; the key information is front-loaded.

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 tool with one optional parameter, the description covers the main behaviors adequately. It does not explicitly state what happens when a slug is provided beyond the schema's hint, and there is no output schema, but the complexity is low enough that this is a minor gap.

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 covers the slug parameter fully, and the description adds extra semantic value by clarifying that omitting the argument returns the guide list. This supplements the schema's parameter description rather than repeating it.

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 identifies the tool as providing step-by-step configuration guides for ClickPhone devices/apps and explicitly states that no argument returns a list of guides and a glossary. It is distinguishable from siblings by content, though it does not explicitly name or differentiate against sibling tools.

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?

Usage is implied: call with no argument to get the guide list/glossary, or pass a slug to retrieve a specific guide. However, there is no explicit guidance on when to prefer this over clickphone_cauta or clickphone_pagina, and no exclusions are stated.

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