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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true. The description adds meaningful behavioral context by clarifying that the returned number is the last used number, not the next available number, which prevents a likely off-by-one misuse.

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 short and front-loads the important semantic about the returned number. The raw endpoint string is somewhat technical but helps map the tool to the underlying API, and no sentence is wasted.

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 read-only tool with one required parameter and no output schema, the description covers the core purpose and the most important return-value semantics. It could do slightly more to explain error behavior for unknown sequence names, but it is largely complete.

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 coverage is 100% and the single parameter 'name' already has a description. The description mentions 'sequence name' and mirrors the endpoint path, but it does not add format details, examples, or constraints beyond what the schema provides.

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 clearly that it retrieves the active numbering sequence for a given sequence name and explains the key semantic of the returned number: it is the last used number, so the next invoice gets that number plus one. It does not explicitly contrast with the sibling acube_list_numbering_sequences, which keeps it from 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?

Usage is implied by the explanation that the next invoice gets the returned number plus one, which suggests the tool is useful for determining the next invoice number. However, it does not explicitly say when to use this instead of acube_list_numbering_sequences or what happens if the sequence name does not exist.

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