list_preact_repositories

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

No annotations are provided, so the description carries the burden, but for a zero-parameter enumeration tool the risk surface is small. It conveys that this is a read-style listing of queryable repositories but says nothing about the return shape, ordering, or whether the list is static or dynamic. Adequate but thin.

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?

One sentence, front-loaded with the verb and resource, with no filler. The comma splice and the trailing justification clause are slightly loose but cost little.

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?

There is no output schema and no annotations, so the description is the only source of information about results, and it only vaguely gestures at 'information about the Preact ecosystem'. For such a simple tool this is nearly enough, but it leaves the agent guessing what the listed repositories look like.

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 and has an empty schema, so there is nothing for the description to disambiguate. Baseline 4 applies.

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 (list) plus resource (Preact repositories) and adds scope ('that can be queried'), so an agent knows this is a discovery/enumeration tool. It doesn't name the sibling tools (query_preact_docs, get_preact_readme) to differentiate explicitly, which keeps it 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 'this allows you to have information about the Preact ecosystem' hints at why you'd call it, but gives no when-to-use condition or when to prefer the siblings query_preact_docs / get_preact_readme. Usage is only implied.

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