narrate

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

The description makes it clear this is a non-mutating, communicative action ('tell the user'). No side effects are implied or hidden, and the tool's only effect is presenting information.

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 two sentences, with no redundant words. It states the action, the target, the format, and the timing in a compact, easy-to-understand manner.

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 such a simple tool, the description covers all necessary context: when to use it, what to include, and how to deliver it. No output schema is needed, and the description does not omit any relevant information.

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?

Even though the schema only defines a generic 'text' string, the tool description explains that the text should be in plain English and describe what the agent is about to do. This fully clarifies the parameter's intended content.

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: to tell the user what the agent is about to do. It uses a specific verb ('tell') and specifies the resource (the user) and the content (upcoming actions). This distinguishes it from other tools that perform mutations or queries.

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 explicitly instructs to call this tool before a batch of mutations, giving a clear trigger condition. This provides unambiguous guidance on when to use it, even without mentioning alternatives.

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