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

The annotations already establish that this is a non-read-only, non-destructive mutation. The description adds meaningful behavioral detail beyond the annotations: a vendor may be created, an alias is recorded, and the vendor is set on every unassigned row with that description. It does not discuss reversibility or conflict handling, so a 4 is appropriate.

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-loaded around the main action, with a separate effects sentence that highlights the important side effects. The phrasing is slightly indirect and poetic, but no sentence is wasteful.

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 four-parameter mutation with no output schema, the description covers the essential behavior: vendor creation, alias recording, and bulk assignment to matching unassigned rows. It could say more about return values or preconditions, but the core mutation semantics are sufficiently 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 description coverage is 100%, so all four parameters are already documented in the schema. The description reinforces the alias default and explains that the alias is the statement spelling, but it does not add much parameter meaning beyond the schema. The baseline score of 3 is therefore appropriate.

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 a specific action: naming the vendor behind a transaction row and recording its statement spelling as an alias for later rows. It makes the core effect clear, including that the vendor is applied to unassigned rows sharing that description. It does not explicitly differentiate itself from nearby siblings such as purch_vocabulary or purch_get_transaction, so it falls 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 phrase 'Name the shop behind a row once' and 'One vendor, many spellings' imply the intended use case for normalizing repeated vendor descriptions. However, the description does not state when not to use it or name alternatives such as purch_vocabulary or direct transaction updates. Usage is therefore implied rather than explicitly guided.

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