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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety and side-effect profile is fully covered. The description adds only that the definitions are 'ready-made' and enumerated by language, but says nothing about return shape, pagination, or whether starters can be customized - modest added value given the annotations carry the bulk.

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?

A single compact sentence with no filler and the resource front-loaded; the language enumeration is informative rather than padding. It is a touch terse - an explicit verb ('List') would make it self-contained instead of relying on the tool name.

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 zero-parameter list tool with no output schema, the description conveys the basic content but not the return structure - the agent cannot tell whether it gets names, versions, or full build definitions. Given the absence of an output schema, one clause about what a starter record contains would close the remaining gap.

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 rubric the baseline is 4. There is nothing for the description to clarify beyond confirming there is no filtering or input, which it implicitly does by describing a fixed set of starters.

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 states a specific resource - ready-made sandbox definitions - and even enumerates the available languages (Python, Java, Go, Rust, Ruby), which tells an agent concretely what it will get. The verb 'list' comes from the name rather than the description, and it does not explicitly distinguish itself from the crowded family of sibling list_* tools (e.g. list_sandbox_templates).

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 trailing phrase 'to create a sandbox from' implies the tool is a precursor to sandbox creation, which is useful implied usage context. However, there is no explicit when-to-use guidance and no mention of how it relates to sibling tools such as list_sandbox_templates or build_sandbox_template, leaving the agent to infer the choice.

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