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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is covered. The description adds genuine behavioral context beyond that: daily check cadence, quota-induced delays, the proxima_em/verificado_em timestamps, and e-mail delivery to the verified address with an unsubscribe link. The e-mail and unsubscribe material is only loosely tied to a listing operation, which keeps this from a 4.

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 core purpose is front-loaded in the first sentence, but the remaining five sentences drift across check scheduling, skill coverage, quotas, e-mail/unsubscribe, and wallet-only owners. Several of these do not clearly serve an agent deciding whether to call this tool, so the text is longer than it needs to be without being incoherent.

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 parameters and no output schema, the description carries the burden of explaining what comes back, and it partially does so (review level, slots, plans, timestamps). However, it never clarifies the shape or grouping of the returned list, and it spends space on notification mechanics that do not complete the picture for a caller.

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 tool takes zero parameters, so per the rubric the baseline is 4. The mention of proxima_em and verificado_em describes response fields rather than inputs, which is harmless but not parameter semantics.

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 names the resource (the MCP servers and skills the account watches) and enumerates the fields returned (review level, slots, plans), so an agent knows what it gets. It does not name a verb explicitly and does not differentiate itself from the watch_tool/unwatch_tool siblings, but the read-only listing intent is unmistakable.

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 statement of when to call this versus watch_tool, unwatch_tool, or check_tool. The only routing-like sentence ('Wallet-only owners follow changes through the API') is oblique and reads more like an account-type caveat than guidance for selecting this tool.

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