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

With no annotations provided, the description carries the full burden and does disclose meaningful behavior: a hard cap of 100 results, required credential 'none', and cost 'Free'. That answers the auth and cost questions an agent would otherwise have to guess. It omits whether more than 100 cases are reachable (pagination/truncation) and whether results are ordered, which keeps it from a 5.

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, front-loaded with the scope and result cap, with credential and cost treated as compact trailing metadata. The 'I want to see...' opening is slightly wasteful versus a direct declarative, but nothing is verbose or padded.

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 read-only, zero-parameter list tool with no output schema, the description covers scope, result limit, returned fields, credential, and cost — enough to invoke it correctly. The one material gap is what happens beyond the latest 100 cases, but given the tool's simplicity this is a minor omission.

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 schema has zero parameters, so there is nothing for the description to disambiguate and the baseline of 4 applies. The field list describes return content rather than inputs, which is a reasonable substitute given no inputs 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?

The description gives a specific verb and resource ('Lists the latest 100 cases') and enumerates the returned fields (reference numbers, titles, status, court level, filing dates), which lets an agent distinguish it from single-matter tools like get_matter. The first-person framing 'I want to see which cases have been started' is conversational but still conveys intent. It does not explicitly name sibling list tools (e.g. list_judgments, docket_status), 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?

Usage is implied by the opening sentence — an agent can infer this is for surveying started cases and their progress — but there is no explicit 'use this when / use X instead' guidance. No alternatives such as get_matter for a single case are named, and no exclusions are given. Adequate but with a clear gap.

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