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

Annotations already declare readOnlyHint and openWorldHint=false, but the description adds real value: the permission-gating behavior, the graceful failure mode for non-shared clients, the 'nothing here changes the client's account' guarantee, and the privacy constraint that customer details are excluded. It stops short of describing output/pagination format, but the addition beyond annotations is substantial.

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?

Front-loaded with the audience and operation ('For an AGENCY: a read-only health check...'), then the safety and access constraints. It is dense but every clause carries information, though the long em-dash enumeration of covered areas makes it heavier than strictly necessary.

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, the description carries the burden of describing results and does so by enumerating the health-check contents. Access conditions, safety profile, and privacy limits are all covered, leaving nothing an agent needs in order to invoke it correctly.

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 100%; the single 'client' parameter is documented as 'the client's name as shown in my_agency.' The description implies the same identifier ('one of its clients') but adds no syntax or format detail beyond the schema, so the 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 states a specific verb and resource ('read-only health check on one of its clients') and enumerates exactly what the check covers (Google connection, failed changes, Autopilot, audit score, etc.). It is clearly distinguishable from adjacent tools and is scoped to agency use.

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?

It gives an explicit precondition ('Only for clients who have switched on sharing with this agency'), states what happens otherwise ('for others it says so'), and names the alternative to use in that case ('request_client_access can ask them'). When-to-use and the fallback path are both spelled out.

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