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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered. The description adds real context beyond that: the data source is the PlayStation Store and the unlock basis is local midnight on 19 Nov 2026, which tells an agent how to interpret the returned time.

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, zero waste, with the core answer front-loaded and the parameter default second. The phrasing is telegraphic rather than polished but nothing extraneous is present.

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 single optional-parameter read tool with full schema coverage and annotations, the description covers scope, default behavior, data source, and the reference timestamp. Only the shape of the return value is unstated, and no output schema exists to cover it, but the answer type is evident from the description.

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 100%, so baseline would be 3, but the description adds the default behavior (omitting location returns every region), which the schema does not state. That is meaningful semantics beyond the field description.

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?

Names the exact resource and answer being returned: the GTA 6 unlock time, with the supported location granularity (country, city, IANA time zone) spelled out. It is clearly distinct from siblings like get_launch_facts and get_gta6_map, though it never names them explicitly.

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 'Omit `location` for every region' clause gives explicit guidance for the optional-parameter default, which is genuinely useful. There is no when-not guidance or reference to the alternative sibling tools for related launch information.

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