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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered by structured data. The description contributes a little extra by stating the payload carries capability mapping and the version each effect first appeared in, but it says nothing about ordering, completeness, or behavior when a version predates an effect.

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?

One short sentence with no filler, and the key noun ('all declared effects') is front-loaded. It is efficient, though efficiency here partly reflects under-specification rather than tight writing.

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 one required, undocumented parameter, no output schema, and no usage guidance, the definition leaves the agent without what it needs to call the tool correctly. A single clause explaining what forVersion means would close most of the gap, and its absence is significant for a required argument.

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?

The single required parameter 'forVersion' has 0% schema description coverage, so the description is the only place its meaning could be established — and it does not address it. The phrase 'the version they appeared in' describes an output field, not the input, leaving the agent to guess whether forVersion selects the target version, a minimum version, or a filter.

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 names the resource (declared effects) and two attributes of the payload (capability mapping, version introduced), so an agent can guess it returns a catalog of effects. However, it is a noun phrase with no verb, and it never says what the tool actually does with 'forVersion' or what 'declared effects' are scoped to. It is identifiable but vague rather than a precise verb+resource statement.

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 when-to-use guidance at all: no conditions, no prerequisites, and no mention of related tools such as changelog_for_version or limitations_list that an agent might confuse with this one. The reader must infer usage entirely from the name.

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