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 description's 'Read-only' merely restates structured data. It does add the notion that results are 'earlier revisions' rather than the current version, but says nothing about ordering, pagination, or result limits.

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 short, front-loaded sentences with no filler; the verb and resource lead. The trailing 'Read-only' duplicates the annotations and is the only mildly wasted 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?

For a 4-parameter tool with no output schema and 25% schema coverage, the description is too thin. It omits what a revision record contains, whether results are paginated, how 'before' scopes the window, and what 'path' means for a skill.

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 only 25% (just workspace_id), so the description must compensate but does not. It covers the required 'id' but leaves 'path' (default '/', maxLength 2048) and 'before' (integer >= 1) completely unexplained in both schema and description.

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 earlier revisions of a skill') plus the lookup key ('found by id'). The 'skill' resource clearly separates it from the sibling pathrule_history_memory and pathrule_history_rule, though it never names those alternatives 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?

There is no when-to-use or when-not-to-use guidance. An agent must infer that this is for revision history rather than current state, and that pathrule_read_skill or pathrule_list_skills are the alternatives for reading the live skill.

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