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

Annotations already declare readOnlyHint and idempotentHint, so the description need not repeat them. It adds the useful behavioral detail that a baseline must be saved before comparing, implying persistent local state. The save_baseline action's local file write does not contradict the readOnlyHint annotation since it does not mutate the external D365 system.

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 with no filler: the purpose statement is front-loaded, and the usage guideline follows immediately. Every word contributes value.

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?

The description covers the primary workflow but fails to mention the 'compare_caches' action, so an agent reading only the description would not know that direct cache-to-cache comparison is possible. It does not describe the changelog return format beyond naming the categories, though no output schema exists. Overall moderately complete but with a clear 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?

Schema description coverage is 100%, so each parameter is already documented per action. The description adds a temporal relationship between parameters (save baseline first) but no additional parameter syntax or format details, so the baseline of 3 is 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 uses a specific verb ('Compare') and resource ('two D365 F&O KB snapshots') and names the output ('changelog with added/removed/modified objects'). This clearly distinguishes it from sibling tools like compare_objects or list_objects, which operate on different resources or produce different outputs.

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?

The description gives an explicit workflow: 'Use action save_baseline once, then compare between two snapshots,' which explains the required ordering. It does not name alternatives or exclusions, and it omits the third action (compare_caches), so it stops short of a full 5.

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