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

The readOnlyHint annotation already tells the agent this is a safe, non-mutating read, so the bar is lower. The description does add value by naming what each entry carries (date, tools affected, count) and the categories of change, but it says nothing about ordering, volume, or how far back the log goes.

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 front-loaded sentence that identifies the resource first, then enumerates contents, then parameters. The mid-sentence list of change types runs slightly long but every element is informative.

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 an output schema, full parameter documentation, and readOnlyHint already in structured fields, the description only needs to convey what the log is and how to narrow it, which it does. Nothing needed to invoke it correctly is missing.

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 100%, so both parameters are already fully documented in the schema. The description's 'optional tool name to filter, and limit' merely restates them without adding format or behavioral detail, making the baseline 3 appropriate.

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 states a specific resource (a dated changelog of data changes sold by this server) and enumerates the kinds of entries it contains, so an agent knows exactly what it retrieves. It does not name or contrast any sibling tool, which is the only thing keeping it from a 5.

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 it should call this to audit historical data changes, and the description notes an optional tool filter. There is no explicit statement of when to use it versus related tools (e.g. freshness or daily_digest), nor any exclusion guidance.

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