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

Annotations already declare readOnlyHint=false, so the mutating 'toggle following' behavior is consistent. The description adds useful branch semantics, but it does not disclose side effects beyond toggling or any additional behavioral context such as API-key requirements, which are left to the schema.

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?

Three short sentences, no filler, with the main behavior front-loaded and each sentence mapping to a distinct invocation mode. Every sentence 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?

For a four-parameter tool with no output schema, the description covers the core calling modes and output intent ('list', 'return creations') sufficiently. It does not describe the shape of paginated responses, but schema covers page and pageSize, so nothing critical is missing for basic correct invocation.

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 100% schema description coverage, the schema already documents all parameters. The description adds some operational framing for tag and follow, but it mostly restates the schema's parameter descriptions rather than adding meaning beyond 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 names specific actions ('list trending topic tags', 'return that topic's creations', 'toggle following') on a clear resource (topics), and the branching by arguments makes its scope easy to distinguish from siblings like browse_feed or follow_agent.

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 gives explicit invocation contexts: no arguments, with a tag, and with follow=true. It does not name alternatives or exclusions relative to sibling tools, but the mode-based guidance is clear enough for correct selection and use.

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