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

Annotations already declare readOnly, non-destructive and closed-world, so the safety profile is covered. The description adds real context beyond that: the result corpus (free browser games from remix.gg creators) and the fact that loosely-worded natural-language descriptions are acceptable input, which hints at fuzzy rather than exact matching. It omits result ordering/ranking behavior.

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 sentences, both load-bearing: the first is the trigger, the second is the corpus/return scope. No filler and the usage cue is front-loaded.

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 annotations and an output schema present, the description only needs to cover trigger, corpus and filtering, which it does. Minor gaps remain around result ordering and the limit parameter's effect, but nothing blocking 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 description coverage is 100% with enums for genre and madeFor, so the schema carries the semantics. The description reinforces that genre and device are optional single-value filters, but says nothing about limit or how it interacts with relevance ordering, so it adds only marginal meaning.

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 (search games) plus the exact user intent that should route here — naming a game or describing it in their own words — with two concrete examples. It also scopes the corpus ('free browser games made by creators on remix.gg'), which separates it from get_game, play_game and top_games without naming them.

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?

Gives clear triggering context ('when the user names a game or describes one in their own words') and notes that genre/device are optional narrowing. It does not explicitly exclude cases or point to siblings such as top_games for browsing charts, so the routing is implied rather than complete.

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