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

readOnlyHint=true already tells the agent this is a safe read. The description goes beyond that by disclosing the shape of the payload (extraction status plus extracted values), which matters because there is no output schema. It stops short of covering ordering, pagination, or what statuses can appear, so it is not a 5.

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?

A single sentence, front-loaded with the resource and followed by the qualifying detail. Nothing is redundant or padded.

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 one-parameter list tool with annotations covering safety and no output schema, describing the returned fields largely closes the gap. Missing only edge-case behavior such as ordering, pagination, or handling of clients with no reports.

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?

There is only one parameter and its schema description is complete (100% coverage), including where clientId comes from (list_clients). The description adds no additional meaning about the identifier, so baseline 3 applies.

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 (health reports for a client) and enumerates concrete examples (body-composition scans, blood tests) plus what each item carries (extraction status, extracted values). An agent can distinguish this read/list tool from the write siblings upload_client_health_report or delete_health_report without opening schemas, though it never names those siblings explicitly.

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?

Usage is implied: fetch reports for a given client. There is no explicit statement of when to prefer this over upload_client_health_report, delete_health_report, or accept_health_report_into_progress, nor any prerequisite or exclusion notes. An agent can infer the read-only listing role but gets no routing help.

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