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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so "Read-only" at the end is redundant. However, with no output schema the description earns credit for disclosing exactly what comes back: listed status, page, play and upvote counts, link validity, maker-claim status, boost eligibility, and claim/boost links.

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?

The purpose and accepted inputs are front-loaded in the first sentence, and the return contents follow in one dense sentence. The trailing "Read-only" is pure repetition of the annotation and is the one wasted fragment.

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-parameter read tool with no output schema, the description covers the essential behavioral surface by enumerating the response fields and the fallback behavior when the game is unlisted. It stops short of error/edge handling (invalid slug, ambiguous input), which keeps it from a 5.

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% and the single parameter's schema description already enumerates play link / page link / slug. The description repeats that same set without adding format, normalization, or ambiguity-handling 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?

The description opens with a specific verb+resource ("Looks up a browser game on Foundplay") and immediately names the accepted identifiers (play link, Foundplay page link, slug). It is clearly the composite lookup tool versus the narrower siblings get_boost_options and get_listing_link, both of whose outputs it absorbs.

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 implied by the accepted input types (you call it when you have a game link or slug), but there is no explicit when-to-use/when-not statement and no mention of the siblings. An agent has to infer that get_boost_options and get_listing_link are for the narrower cases this tool already reports on.

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