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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds useful substance beyond that: the fields returned, the special-case main unit with unidade_id 0, and the underlying endpoint — details an agent could not infer from annotations alone.

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 tightly written sentences: the returned content first, then the usage implication, with the endpoint tucked at the end. Nothing is redundant, though the raw GET path is marginally less useful to an agent than additional semantics would be.

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 parameters, no output schema and full annotation coverage, the description carries the burden of describing return content — which it does by naming the fields. It is nearly complete for this complexity; only the overlap with feegow_list_locations is unaddressed.

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 per the baseline a 4 applies. The description correctly implies no filtering arguments are needed, consistent with the empty input schema.

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 verb and resource: lists the main unit (matriz, unidade_id 0) plus branches, enumerating returned fields (trade name, CNPJ, address, contacts). It is clear what the tool does, though it does not distinguish itself from the sibling feegow_list_locations, which could plausibly mean the same thing to an agent.

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?

"Use the unit ids to filter other tools" gives explicit downstream usage and explains why a caller would want this list. It stops short of exclusionary guidance — nothing says when to prefer feegow_list_locations over this tool, which is the one real ambiguity.

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