crunchyroll_add_to_watchlist

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

No annotations are provided, so the description must convey behavior. It only states the action without disclosing side effects, such as whether the operation is idempotent, whether it overwrites existing entries, or if authentication is required. The description is too brief for a mutation tool.

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 sentence with no fluff. It is front-loaded and concise, conveying the essential information without unnecessary words.

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 simple add operation with one parameter and no output schema, the description is adequate but minimal. It does not mention any preconditions or postconditions. Given the simplicity, a score of 3 reflects that it meets minimum viability but leaves gaps.

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 input schema has 100% coverage with a single parameter described as 'Series or movie ID to add'. The description adds no extra meaning beyond the schema. Baseline 3 is appropriate since the schema already fully documents the only parameter.

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 action ('add') and the target ('anime series or movie to the watchlist'). It is specific about the resource being modified. However, it does not distinguish from sibling tools like 'remove_from_watchlist', but the purpose is unambiguous.

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. For example, no mention of prerequisites (e.g., requires login) or when to add versus remove from watchlist. The description implies usage but provides no context about appropriate scenarios.

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