send_chat_action

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

Annotations already indicate non-read-only, open-world side effects, and the description adds that the tool informs the user of an ongoing action. However, it does not disclose that the effect is a transient status indicator, nor does it explain prerequisites or optional parameter contexts. No contradiction with annotations.

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 a single, short sentence that is front-loaded with the verb and resource. No unnecessary words or repetition.

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?

There is no output schema and the description does not mention the return value or that the action is a temporary chat status. With low schema coverage and undocumented optional parameters, the description leaves gaps that an agent would need to infer.

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 only 25% (chat_id described). The description gives action examples but these are already enumerated in the schema, and it does not explain message_thread_id or business_connection_id. Thus it fails to compensate for the low coverage.

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 that the tool tells the user the bot is performing an action, with examples like typing and uploading. It is not a tautology and identifies the resource (the user chat), but it does not explicitly distinguish itself from the many sibling send_* 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 provides no guidance on when to use this tool versus alternatives, such as before sending a message or during a long operation. There is no mention of exclusions, prerequisites, or which sibling tools to prefer.

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