set_chat_photo

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

The description does not disclose behavioral traits beyond the basic mutation. With no annotations provided, the description should convey permissions, file constraints, or side effects, but it only states the action and default chat. This leaves significant gaps for the agent.

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 extremely concise with two sentences. The most important information is front-loaded, and there is no extraneous text. Every sentence serves a clear purpose.

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?

The tool has 2 parameters and no output schema, so the description is somewhat adequate. However, it omits critical context such as permission requirements, file size/type restrictions, and whether the photo replaces or updates. This gap reduces completeness.

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%, but the description only repeats the schema's information about chat_id defaulting. It adds no new meaning for either parameter, such as explaining the photo file path requirements or chat ID formats. The baseline of 3 is not met because no extra value is provided.

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 action ('Set a new profile photo') and the resource ('for a chat'), and distinguishes from siblings like 'delete_chat_photo' by specifying the operation. It also clarifies scope by mentioning default log group when chat_id is omitted.

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 context on when to use this tool (setting a profile photo) and hints at default behavior when chat_id is omitted. However, it does not explicitly indicate when not to use it or contrast with alternatives like 'delete_chat_photo'.

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