vk_post_user_ab5e5c810e91

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

With no annotations provided, the description carries the full burden. It discloses that authentication is required, that this is a raw proxy, and that parameter names accept aliases. It also lists valid types. It could mention side effects or reversibility, but the core behavior is transparent.

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 well-structured with several sentences, each providing useful information (valid types, proxy details, aliases, auth). There is minor redundancy in stating 'Set the user's avatar' and 'Changes the user avatar', but overall it is efficient.

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 only one parameter and no output schema, so the description should explain how to construct the body. It lists valid types but not the expected key/structure within the body. The optional/required contradiction further reduces completeness. It does cover auth and aliases, so it is not severely incomplete.

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?

The schema has 100% coverage with a minimal body description, so the baseline is 3. The description adds meaning by stating the body is a JSON payload and enumerating valid types. However, it contradicts the schema by calling the body 'optional' when the schema marks it required, confusing the parameter's necessity.

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 tool 'sets the user's avatar' and identifies the exact raw endpoint POST /user/settings/avatar. It lists valid avatar types, making the purpose specific and distinguishing it from other user-related proxy 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?

Provides concrete guidance: pass JSON in the body field, use camelCase/snake_case aliases, and authentication is required. It also explains the raw proxy nature. However, it does not explicitly name alternatives or when not to use this tool, but the endpoint-specific context is strong.

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