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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds no behavioral details beyond the fact that this is a read-only listing, but the annotation coverage lowers the burden and there is no contradiction.

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?

Three short sentences, each earning its place: the core operation, a one-line domain clarification, and a pointer to the prerequisite tool. The key action 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?

For a simple one-parameter, read-only list tool, the description is nearly complete: it defines scope, gives the prerequisite lookup path, and annotations cover safety. It does not describe the result shape, but 'List all personas' strongly implies an array result and no output schema is provided.

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 gives campaignId only as a string, so the description compensates by establishing that this must be a campaign ID and pointing to campaignstack_list_campaigns as the source of valid IDs. It does not explicitly map the parameter name, but with only one parameter the inference is unambiguous.

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 opens with a specific verb and resource ('List all personas for a campaign') and adds domain context distinguishing personas from generic campaign data. It also names the sibling tool for fetching campaign IDs, reinforcing the 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?

It explicitly instructs agents to use campaignstack_list_campaigns to find valid campaign IDs, which is a clear prerequisite. It lacks explicit exclusions for related persona tools such as get_persona, so it does not earn a 5.

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