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

Annotations already declare readOnlyHint and openWorldHint, but the description adds real behavioral detail about the generated artifact: it stops at the first error, skips already-installed components, and never starts servers. That tells an agent what the script will and won't do when later executed. It doesn't cover authentication requirements or how the script body is returned.

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 tight sentences with no filler. The core deliverable is front-loaded, followed by behavioral constraints and the user-review instruction in logical order.

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 two-parameter read-only tool with no output schema, this covers purpose, OS mapping, execution semantics, and handling guidance. The only omission is how the script text is returned, a minor gap against the annotation coverage.

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?

Schema coverage is 50%: the repo parameter is documented in the schema, but the os enum values carry no descriptions there. The description compensates by mapping each OS to its script flavor (bash vs PowerShell), which adds meaning beyond the bare enum. That fills the main coverage gap.

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 deliverable: a single setup script for the repo, tailored per OS (bash on macOS/Linux, PowerShell on Windows). An agent can tell it produces a script rather than executing setup. It stops short of naming the sibling get_setup_manual to sharpen the distinction.

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 gives a post-retrieval usage rule ('Show it to the user to read before running it'), which is useful context for how to handle the result. But there is no explicit guidance on when to choose this over get_setup_manual, leaving the alternative to inference from the names alone.

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