set_chat_photo

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

No annotations are provided, so the description must carry the full behavioral burden. It only states 'Change a chat's photo' without mentioning side effects, required permissions, whether the previous photo is replaced, or whether the change is reversible. This is a mutation tool, and the description leaves those behaviors undisclosed.

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, front-loaded sentence with no filler. It earns its place by stating the core operation directly and efficiently.

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 two-parameter tool, the description is minimal but still incomplete. There is no information about expected file path semantics, required permissions, return behavior, or failure conditions, and no annotations or output schema help fill those gaps.

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 0%, so the description needs to compensate, but it does not explain either parameter. While 'chat_id' and 'file_path' are inferable from the tool name and schema, important details like what file formats are accepted or what 'file_path' refers to are missing.

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 a specific resource ('a chat's photo'), making the tool's function immediately clear. It also distinguishes itself from sibling tools like set_chat_title and set_chat_description, since the resource (photo) is unique.

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?

There is no guidance on when this tool should be used versus alternatives such as send_file or set_chat_title. No context about prerequisites, exclusions, or situations where a different tool would be more appropriate.

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