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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered by structured data. The description adds that each item includes a demonstration summary, which is modest extra context, but says nothing about ordering, count, or filtering behavior beyond that.

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 short sentences, the core purpose front-loaded, and the sibling pointer placed where it reads as a next step. Nothing is redundant 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?

With zero parameters and an output schema describing the returned templates, the description needs only to state what the list contains and how to go deeper, and it does both. Minor gaps such as item ordering or whether the list is exhaustive are not covered, but they are unlikely to affect a correct call.

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 no parameter semantics to explain; the baseline for a parameterless tool applies. The description correctly implies no inputs are needed to enumerate the catalog.

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 (Lists) plus the resource (the working starter apps a new fuast app can begin from) and states what each entry contains ('what each one demonstrates'). It also distinguishes itself from get_template, so an agent can tell the catalog listing apart from the file-fetching sibling without opening a schema.

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?

It makes the usage context clear — browse templates before starting a fuast app — and routes the agent to get_template for a template's files. It stops short of explicit exclusions or conditions like 'use this only when you don't already know the template name,' so it lands at a clear-but-not-exhaustive 4.

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