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

With no annotations, the description must carry the full burden of behavioral disclosure. It adds the useful statement 'carries no recipient PII', which is privacy-relevant, but it does not mention whether the operation is a read-only, the latency, or any side effects. Given the low complexity, this is adequate but not comprehensive.

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 two sentences with no extraneous words. The primary function is stated first, and the PII note adds value. It is appropriately short for a simple read tool.

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?

Given the tool's low complexity (one parameter, no output schema) and absence of annotations, the description covers the key aspects: what it does, its purpose, and a privacy guarantee. It lacks detail on the exact metrics returned, but given the simplicity and the schema coverage, it is mostly complete. A clear sibling differentiation would push it to 5.

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 schema provides 100% coverage for the single required parameter (organization_id), so the baseline is 3. The description adds no additional parameter-specific meaning beyond indicating aggregates are scoped to an organization, which is implicit in the schema. It does not introduce new semantics that would elevate the score.

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 tool reads deliverability and backlog aggregates, and it identifies itself as the operator's health view. However, it does not explicitly contrast with sibling tools like commsharbor_delivery_get or commsharbor_domain_deliveries, so some ambiguity remains about its exact scope.

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?

The description implies it is for operators to check sending health, but it does not specify when to use this over other deliverability-related tools or provide any explicit conditions. It lacks guidance on when not to use it, leaving the agent to infer the context.

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