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

Annotations already declare destructiveHint=true, idempotentHint=true, readOnlyHint=false, and openWorldHint=true, so the safety profile is covered. The description adds account scoping ("its account's Vids document") and the HTTP endpoint, which is some useful context, but it does not explain irreversibility, side effects on videos, or auth requirements beyond what annotations provide.

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?

Two short sentences, front-loaded with the purpose, with no filler. The second sentence ("DELETE /avatars/{avatarId}") is arguably redundant with the tool name but still specifies the exact API operation, so it earns its place with only minor redundancy.

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 single-parameter destructive delete with full annotations and no output schema, the description covers the purpose, account scope, and endpoint. It is adequate, though it could note dependencies such as whether the avatar is removed from existing videos.

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%, so the baseline is 3. The schema's only parameter description is the tautological "The avatarId," so the description adds no meaningful semantics beyond restating the parameter in the endpoint path.

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?

States a specific verb ("Remove") and resource ("avatar"), making it clearly distinct from siblings like vids_create_avatar and vids_list_avatars. However, it does not explicitly name or contrast with any sibling tool, so it falls short of the top score reserved for descriptions that both identify the operation and route the agent away from alternatives.

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 to use this tool versus alternatives, no conditions or prerequisites, and no exclusions. The deletion use case is implied only by the verb, which is the minimum implied usage rather than explicit guidance.

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