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

With no annotations, the description carries the full burden. It makes the read-only nature and the scoping (same funding wallet as the calling agent) reasonably evident, and it names the fields of interest. However, it never states whether the calling agent is included in the result, how an empty result should be read, permission requirements, or the response shape — all relevant for a tool that implicitly uses caller identity.

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, no filler: the first establishes the scope of the list, the second states the use case. The scoping constraint is front-loaded before the usage guidance.

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 zero-parameter read tool with no annotations and no output schema, this covers purpose, scope, and intended downstream use, and it names the key return fields (agentLabel, userId). What is missing is minor but real: whether the result includes the current agent and roughly how many agents to expect.

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 takes zero parameters, which is the baseline-4 case. The description correctly frames the implicit selector (the calling agent's funding wallet) rather than pretending there are inputs, so nothing is misleading.

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 gives a specific verb and resource ("List all FortFi agent accounts") plus a precise scope ("funded by the same payment wallet as this agent"), which a reader can distinguish from broader listing siblings such as list_wallets. It stops short of naming an alternative tool, so differentiation is inferred rather than explicit.

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 states a clear when-to-use condition: discovering agentLabel / userId when renewing or spawning siblings in treasury multi-agent setups. It never says when not to use it, and it does not point to a sibling for adjacent cases (e.g. listing wallets or treasury context), so it is clear context but not a full routing rule.

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