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

With no annotations, the description must carry the full behavioral burden. It does disclose that manual source reviews are 'empty until one is recorded' and that a replacement_kind rule is included, which are non-obvious behaviors. It does not state that the operation is read-only/side-effect free, what 'today' means (timezone/cutoff), or how large the response can get, so the safety and cost profile remain unclear.

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 scope statement is front-loaded and the enumerated categories are compact. The parenthetical explaining manual source reviews is useful rather than filler, though the single sprawling sentence mixes return-value categories with schema-adjacent notes.

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?

There is no output schema, so the description is the only place the return shape can be conveyed. It lists the categories but does not say whether they are counts, lists of rows, or nested per-provider objects, and it references a 'replacement_kind rule' without explaining it. Adequate for gist, not for predicting the payload.

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 100% with a single optional 'provider' key, so baseline is 3. The description's phrase 'Per-provider coverage' hints that provider scopes the result, but it never says whether omitting the parameter aggregates across all providers. That is the one semantic the schema cannot express, and it is left unstated.

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 precisely (per-provider coverage for today) and enumerates the categories returned: rows with a known shutdown date, rows with no vendor date, rows not verified today, and unreadable official pages. That is specific enough for an agent to know it is a coverage/reporting tool rather than a record lookup. It never explicitly contrasts itself with siblings such as get_provider or list_upcoming, so the sibling differentiation is only implicit.

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 tool instead of get_provider, list_upcoming, or get_changes_since, and no prerequisites or exclusions. The name and content imply a 'how complete is the data' use case, but the agent must infer that. Clear gaps for a tool with six siblings.

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