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

Annotations already declare readOnly, idempotent, non-destructive, closed-world behavior, so the safety profile is covered. The description adds the genuinely useful constraint that the result set is limited to free apps and is organized by group, but says nothing about ordering, volume, or result limits beyond what the output schema presumably carries.

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 the scope front-loaded and the filter condition second. The inline enumeration of group names is somewhat redundant with the schema enum and introduces the minor naming drift noted above.

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 an output schema and full annotation coverage, the description only needs to convey scope and filtering, which it does. The remaining gap is the relationship to sibling tools (find_apps/get_app), which the agent must infer.

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 is 3. The description only restates the optional group filter already documented in the schema, and its parenthetical group list ('side business', 'learning') drifts slightly from the schema's canonical ids ('business', 'learn'), which could nudge an agent toward invalid values.

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 names a specific resource and scope: "Every free app in the PriorStates Studio Gallery," plus the grouping dimension. The "free" qualifier distinguishes it from broader listing/search siblings such as find_apps, though it never names those siblings directly.

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?

Usage is only implied: 'list everything, optionally filtered by group.' There is no explicit statement of when to prefer this over find_apps or get_app, nor any exclusion such as 'use find_apps if you need to search by keyword.'

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