add_sticker_to_set

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

Annotations already indicate this is a write operation (readOnlyHint=false) and not destructive (destructiveHint=false). The description adds no behavioral context beyond the literal action; it fails to mention prerequisites like the user owning the set or that the sticker must be uploaded via upload_sticker_file, nor any side effects on the set.

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 efficient sentence with no fluff, but it is under-specified for a tool with three undocumented parameters. Conciseness is achieved at the expense of utility, so it earns a moderate score rather than a higher one.

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?

With three parameters lacking any description, no output schema, and only a one-sentence purpose statement, the description is grossly inadequate for an AI agent to invoke the tool correctly. It omits crucial details like the role of user_id, the format of sticker, and prerequisites such as uploading the sticker first.

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 must compensate, but it does not explain any of the three parameters. It mentions 'set' and 'sticker' but does not clarify that user_id identifies the set owner, what 'name' refers to (the set name), or how 'sticker' should be provided (e.g., already uploaded file).

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 the specific verb 'Add' with the resource 'sticker to an existing set,' clearly indicating the action and scope. This distinguishes it from siblings like create_new_sticker_set, which creates a new set, and delete_sticker_from_set, which removes a sticker.

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 phrase 'existing set' implies this tool is not for creating a new set, providing some usage context. However, there is no explicit mention of alternatives or when not to use this tool, such as requiring the set to already exist or the sticker to be uploaded first, so guidance is only implied.

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