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 description's 'Read-only' line merely repeats structured data. It does add what category of data is returned (translations plus source-language metadata), but nothing about scope limits or behavior when no scope param is provided.

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, front-loaded with the verb and resource, with no filler. The trailing 'Read-only' is redundant against annotations but does not bloat the text.

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?

An output schema exists, so return-shape explanation is not required, and the description covers the basics of what is listed. However, for a tool with three optional scope parameters, the omission of default/unscoped behavior leaves a real gap for correct invocation.

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 67% and the schema itself explains the projectId/generationId alias relationship, so the description's 'for a project or variant' adds little. The most important undocumented behavior—what happens when zero required params are supplied—is left entirely unstated.

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 and resource ('Lists ... screenshot-layout translations and source-language metadata') and names the scoping entities (project or variant). This implicitly distinguishes it from the sibling list_graphics_translations, though that distinction is never made explicit.

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 'for a project or variant' gives minimal context about when the tool applies, but there is no guidance on when to prefer list_graphics_translations or translate_layouts, and no statement about whether a project/variant is required given that all three params are optional.

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