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

Annotations already establish read-only, idempotent, non-destructive behavior. The description adds that values are recorded change notes from a JSON file, that notes may be absent, and that no new diff is calculated; it still lacks return structure or pagination detail.

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?

Three short sentences, front-loaded with the output and scope. Each sentence adds a useful clarification and there is no filler.

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?

This is a low-complexity read-only tool with one optional parameter, and the description explains retrieval scope and non-computation. With no output schema, it names the returned fields but does not detail their structure, leaving a minor gap.

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 observed parameter has full schema description coverage, including the omit-for-latest default. The description does not add parameter-level meaning beyond what the schema already provides, 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?

Specific verb and resource: returns deltas_vs_prev and recheck notes for a baseline cut, and explicitly says it does not compute new diffs. It does not name a sibling alternative, so it falls short of top-tier differentiation.

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?

Implied use is retrieving recorded change notes for a baseline cut, with a negative usage note against computing diffs. It gives no explicit when-to-use guidance versus siblings like latest_brief or list_observed_dates, and no prerequisite guidance.

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