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

With no annotations, the description carries the full burden, but it does disclose two genuinely useful behavioral facts: no credential required and no cost. It says nothing about ordering, pagination, or volume of results, which for a listing tool is a real gap.

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, front-loaded sentences with no padding. The first-person framing sentence slightly restates what the second sentence states more precisely, a small redundancy that keeps it from a 5.

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 free, uncredentialed, zero-parameter list tool with no output schema, the description gives enough to call it correctly and hints at the shape of the payload ('the legal rule stated by each'). Missing only result-ordering/pagination expectations, a minor gap at this complexity.

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 there is nothing for the description to disambiguate; the baseline for a parameterless tool is 4.

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 concrete verb and resource ('Lists the Court's judgments') and adds a distinguishing detail ('with the legal rule stated by each'). It does not explicitly contrast itself with the singular siblings read_judgment / read_grave_wrongs_judgment / verify_judgment, so it stops 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 opening sentence frames the intent ('I want to see the decisions Peregrini has published'), which maps to a clear use scenario, and 'Credential: none. Cost: Free.' tells the agent the call is unconditionally safe to make. No when-not guidance or named alternatives, so not a 5.

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