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

With no annotations provided, the description carries the behavioral disclosure burden. It conveys that this is a read-only listing operation scoped to the current mount and that summary counts are included, which is reasonable for a simple list tool. It does not discuss authorization, edge cases, or side effects, but the listing nature makes destructive behavior unlikely and the output schema covers return structure.

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 a single concise phrase with no filler: it names the resource, the scope, and the summary aspect of the result. Every word contributes meaning, and the key differentiator 'all' is front-loaded.

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 has no parameters and an output schema exists, the description is largely complete: it specifies what is listed and at what scope. It does not define 'mount' or 'summary counts' in detail, or mention sibling tools, but those are minor gaps for a low-complexity list operation.

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 tool has zero parameters and 100% schema description coverage, so the baseline is 4. The description adds the 'mount' scoping context, which is useful even though no parameters exist to document.

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 the resource ('developmental agents'), the scope ('on this mount'), and the output nature ('summary counts'), which makes the tool's purpose reasonably clear. It lacks an explicit verb like 'list' and does not directly contrast with singular siblings such as get_agent or describe_agent, so it falls just short of a 5.

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 use case is implied by 'All developmental agents' – an agent needing an overview of every agent would pick this over get_agent or describe_agent. However, the description does not explicitly state when to use this tool versus alternatives or mention any exclusions.

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