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

Annotations already declare readOnlyHint, idempotentHint and non-destructive, so the safety profile is covered. The description usefully adds what data is exposed (client tokens) and the 'last seen' freshness signal, but says nothing about pagination, limits, or authorization expectations, so it only modestly exceeds the annotation bar.

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?

A single front-loaded sentence that splits the behavior by key scope and enumerates return contents. No filler, no repetition of the title.

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 one-optional-parameter read tool with no output schema and full annotation coverage, the description is nearly complete: it explains both invocation modes and what comes back. It falls slightly short of full marks because pagination/limits and the workspace-vs-game key source are left implicit.

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% and the schema already explains that the game parameter is ignored when using a game key and is retained by later calls. The description repeats that scoping semantics without adding format/syntax detail, so baseline 3 applies.

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 clear verb+resource (list games) and then enumerates exactly what the listing contains in each of the two key scopes (workspace key -> games with id, name, client token, services; game key -> services, versions, environments, last-seen). It's specific about the return contents rather than tautological. It doesn't differentiate from siblings like glitchless_overview, which is the only gap.

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 two-mode framing ('with a workspace key...' vs 'with a key for one game...') implicitly tells the agent how to invoke it for a desired result, and the schema notes later calls keep the game. But there's no explicit when-to-use/when-not guidance or naming of alternatives such as glitchless_overview for a higher-level view.

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