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

readOnlyHint=true already tells the agent this is a safe read, so the bar is lower; the description adds the underlying REST endpoint and the filter axes, which is genuine extra context. However it says nothing about pagination behavior, result size, or whether the owner lookup fails when the owner is unknown — gaps on a 7-parameter list endpoint with no output schema.

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?

Two sentences, zero filler, with the core purpose and scope front-loaded and the filter set and endpoint trailing. Nothing needs to be trimmed or relocated.

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 no output schema, the description should carry the return shape or pagination semantics, and it only partially does (page/pageSize exist in schema but their effect on the response is unstated). For a read-only listing tool with fully documented parameters, it is otherwise complete enough to invoke 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%, so all seven parameters (owner, service, page, pageSize, search, isAdmin, activated) are already documented in the schema. The description only restates the filter trio already covered there, adding no syntax, defaults, or interaction details beyond the schema.

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 ('List users belonging to an owner (org)') plus the scoping constraint, so the agent knows exactly what entity is returned. It does not name any sibling (e.g. codecov_list_service_owners vs codecov_list_repos), but the 'users' resource is naturally distinct from the other list_* tools.

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 phrase 'optionally filtered by activation/admin/search' implies when the filters are useful, but there is no explicit when-to-use statement, no when-not-to-use, and no named alternative. Usage is inferable from the resource name rather than stated.

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