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

Beyond the readOnlyHint annotation, the description discloses that results are not paged, gives the API endpoint (settings/cashaccounts:get), and states the vendor rate limits (60/min, 1000/24h, one request per call). That is meaningful operational context the annotations do not carry.

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 carrying distinct information: what it returns, the endpoint, and the constraints. Front-loaded with the resource and field list; no filler.

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 correctly compensates by naming the returned fields, and it covers pagination behavior and rate limits. An agent has essentially everything needed to invoke and interpret the call; only an explicit pointer to sibling alternatives is missing.

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, so the baseline is 4. The description still adds value by clarifying which account fields come back and how 'name' maps to 'accountName' downstream, though it cannot document parameters that do not exist.

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?

States a specific resource — 'the company's cash registers' — and enumerates the returned fields (name, ledger account, currency), which cleanly separates it from siblings like list_bank_accounts or list_accounts. It does not explicitly name those siblings, 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 parenthetical 'name (used as accountName in payments)' implies the practical use case — retrieving the identifier needed when creating payments — but there is no explicit when-to-use statement or comparison against the other list_* account tools. Usage is implied rather than stated.

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