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

Annotations already declare readOnlyHint=true, destructiveHint=false, openWorldHint=true and idempotentHint=false, so the safety profile is covered. The description adds value by disclosing the shape of each returned item and the sort order, but says nothing about pagination behavior or result-set limits beyond what the schema already states.

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 with no filler; the core purpose and ordering are front-loaded, and the optional filter with its source tool follows immediately. Every clause carries information an agent would otherwise have to guess.

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 no output schema, the description appropriately enumerates the returned fields, and with only two optional, fully documented parameters the surface is small. The only gap is that behavior beyond the default limit (e.g., how to page further) is not addressed, which is minor for a recent-items list.

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 both parameters are already documented in the schema (limit default 10/max 50, version_id filter). The description adds only a provenance hint ('version_id from list_versions'), which is mildly useful but does not go beyond the structured definition in any substantive way.

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 ('List the most recent matches'), plus ordering ('newest first') and the exact fields returned (when played, game version, external id, player count). This lets an agent separate it from get_match (single match) and count_matches (counting), though it never names those siblings 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?

Gives a clear context of use (browse recent matches, optionally scoped to a version) and helpfully points to list_versions for obtaining version_id. However, it offers no explicit when-not guidance or named alternative for retrieving a single match's details or aggregate counts, so the routing is largely inferred.

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