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

Annotations already declare readOnlyHint, idempotentHint, non-mutating and closed-world, so the safety profile is fully covered without the description. The description adds nothing beyond that: it doesn't say what a 'limitation' entry looks like, whether results are scoped per version, or how categories are enumerated.

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?

It is a single compact sentence, which is good, but the parenthetical 'Y-combinator, etc.' is cryptic filler rather than useful front-loaded information. Brevity here reflects under-specification rather than discipline.

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 annotations burden relief needed, no output schema, and zero parameter documentation, the description leaves an agent without the essentials: what a limitation entry contains, how category values are formed, and what forVersion expects (e.g. a release tag or language version).

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 0% for two required parameters, so the description had to carry the load and it does not. Worse, it says results are 'optionally filtered by category' while the schema marks category as required, and forVersion is never mentioned at all despite being required.

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 name and title say 'Known limitations', and the description mostly restates that with a parenthetical example ('Y-combinator, etc.') that hints at language-feature limitations rather than stating what the tool actually returns. An agent can guess the resource is a list of documented limitations, but the verb is implicit and the domain is unclear.

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?

There is no statement of when to call this versus siblings such as ailang_versions, changelog_for_version, or docs_search, all of which could plausibly answer questions about a version. No preconditions, no exclusions, no alternative routing.

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