mdl_watchlist_fetch

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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is fully covered. The description adds the meaningful auth prerequisite, but says nothing about pagination, rate limits, or whether last_updated_at affects the result set, so it adds only moderate value over 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 with the key information (fetch, example, auth) front-loaded. The leading "Watchlist: fetch" prefix is redundant with the tool name, but the overall text is tight and wastes little.

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 no output schema and one of two parameters (last_updated_at) undocumented, the description leaves the agent without enough to call the tool confidently. It does not explain the return shape, pagination, or how it differs from the sibling fetch/page tools, which matters for a list-retrieval tool.

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 0%, so the description must carry the parameter burden. It hints at the status parameter via "status list" and the `completed` example, but never explains the enum values or the purpose of `last_updated_at`, which is completely undocumented in both places.

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 gives a specific verb and resource ("Fetch a status list") and the example path `/sync/mylist/completed` clarifies it returns the authenticated user's own watchlist filtered by status. It does not, however, distinguish itself from close siblings like mdl_watchlist_fetch_page or mdl_users_get_user_watchlist, so the agent cannot tell which fetch to choose without opening schemas.

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 when-to-use or when-not-to-use guidance and no alternative tool is named. The only guidance is the authentication prerequisite ("Requires host-configured MyDramaList authentication"), which is a prerequisite rather than selection advice.

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