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

Annotations already establish readOnly, idempotent, non-destructive, closed-world behavior, so the description's remaining job is scope and output content, and it delivers both: results are limited to the signed-in person's own versions and include findings anchored to exact words plus learners' flags. No output schema exists, and the description still omits ordering, limits, and what an empty result means, which keeps it from a 5.

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, front-loaded with the scope qualifier and followed by the return contents and the downstream action. It is tight, but the compressed phrasing ('base to the old version's hash') is ambiguous on first read and could use one clarifying clause.

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 parameters and no output schema, the description must carry the return shape, and it does: version, word-anchored findings, learner flags. The workflow hint about setting base to the old hash covers the natural next step. What is missing is result volume/ordering behavior and any distinction from the similarly named revise_needs.

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 tool takes zero parameters, so there is nothing for the description to disambiguate and the baseline of 4 applies. The description does not waste space inventing parameter detail, and its mention of 'base' and 'hash' correctly implies that value is supplied on the write side, not here.

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 a specific resource and scope: the signed-in user's own commons versions that carry findings or learner flags, plus what is returned (the version, word-level findings, flags). That is more than a restatement of the title. It falls short of 5 because the vocabulary ('commons versions', 'base', 'hash') is tool-specific jargon and the boundary with the sibling revise_needs is not drawn.

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 only implied: an agent can infer this is the review/repair entry point and that the result feeds an improved submission ('An improved version sets base to the old version's hash'). There is no explicit when-to-use, when-not-to-use, or named alternative, and the similar-sounding revise_needs sibling is never mentioned.

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