mdl_account_map_profile_picture

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

The annotations already disclose this is a non-destructive, non-idempotent, open-world write. The description adds the crucial missing context: it requires host-configured authentication and mutates account state, so it must not be used speculatively. That's meaningful extra behavioral guidance beyond the annotations.

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?

Three short sentences, all front-loaded and zero-waste. Purpose, dependency, auth, and caution each get exactly one clause.

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 one-parameter mutation tool, this covers the purpose, dependency, auth requirement, and usage warning. Only the return behavior is absent, and there's no output schema to lean on, but that's a minor gap.

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 coverage is 0% and there are no annotations, but the description compensates by naming the actual source of the value ('the filename returned by mdl_upload_image'). It doesn't explain the format or validity of that filename, so it adds partial but not full meaning.

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 ('map profile picture') and resource ('Account'), and its dependency (filename from mdl_upload_image) distinguishes it from every sibling.

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?

Explicitly warns to use only for an explicit user request and that host-configured MyDramaList auth is required. It doesn't say what to do if the user hasn't uploaded an image yet, but the constraint is clear.

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