Favorite asset collection

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

Annotations already declare readOnlyHint=false, destructiveHint=true, idempotentHint=false and openWorldHint=true, so the description's only addition is the 'authenticated user's library' scope. It says nothing about what happens on repeat calls (idempotentHint=false) or that the operation is effectively irreversible, which matters for a tool flagged destructive.

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?

A single front-loaded sentence with no waste; the verb and target come first. It is efficient, though its brevity is partly under-specification rather than economy.

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 annotations covering the safety profile and 100% schema coverage, the description does not need to restate parameters or return values (no output schema exists). It is minimally adequate, but among 60+ siblings a mutation tool should at least route the agent away from unfavorite_asset_collection and note the confirm requirement.

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 all four parameters (including the unusual 'account' label semantics and the confirm gate) are already documented in the schema. The description adds no parameter-level meaning beyond that, making the baseline 3 appropriate.

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 ('Favorite') and resource ('asset collection'), and scopes it to the authenticated user's fal Assets library. However, it never mentions the near-identical sibling unfavorite_asset_collection, so the agent gets no explicit disambiguation from the sibling list.

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?

No guidance on when to use this versus unfavorite_asset_collection, or when-not to use it. It also fails to mention the confirm gate that the schema implies is required for this action, leaving the invocation condition to inference.

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