setChatMenuButton

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It usefully states the return value ('Returns True on success'), but it does not mention failure behavior, authorization requirements, side effects, or the fact that this applies only to private-chat menu buttons.

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?

A single sentence that is front-loaded with the core behavior, then states the return value. There is no filler or redundancy; every word contributes meaning.

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 setter with two optional parameters, a fully covered schema, and a stated return value, the description is nearly complete. It lacks only explicit notes about error conditions or permission scenarios, but these are not required for basic 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?

Schema description coverage is 100%, so the schema already documents both parameters thoroughly. The description adds no new meaning beyond what the schema provides, which fits the baseline score of 3.

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 uses a specific verb ('Change') and clearly identifies the resource: the bot's menu button, with two distinct scopes (a specific private chat or the default). This distinguishes it well from sibling getChatMenuButton and other set* 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?

The description explains the two contexts in which the tool applies (per-chat and default), giving the agent a clear idea of when to invoke it. However, it does not explicitly mention alternatives or when not to use this method, so usage guidance is implied rather than fully stated.

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