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

Annotations already declare readOnly, idempotent, non-destructive and non-open-world. The description adds meaningful scope context beyond that: the data is vanilla-only and sourced from Bohemia's public repository, which tells the agent the results exclude mods and where authority comes from. It does not discuss staleness or refresh cadence.

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?

Four tight sentences, zero filler, with the core purpose front-loaded and the three invocation modes packed into the tail. Every clause carries information an agent would otherwise have to infer.

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 output schema, the description does the work of outlining return shapes per mode (list of updates, added/removed/changed entries, per-class history), which is exactly what an agent needs. It omits how the map parameter narrows results, a small gap given 4 optional parameters.

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 coverage is 75% and both enums (map, lang) are self-describing via enum lists. The description adds real meaning the schema lacks: the version parameter accepts either an update id or a bare version like '1.29' resolving to its first release, and that 'item' with no version switches to a history mode. The 'map' parameter's effect on results is left unexplained.

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 ('what each DayZ update changed in the vanilla Central Economy files') and enumerates the exact files affected, so an agent can distinguish it from siblings like explain_server_setting or validate_config_file without opening a schema.

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 explicit invocation modes keyed to parameters: no version returns the update list, version returns added/removed/changed entries, and item without version returns one class's history. That is strong when-to-use routing, though it never names an alternative sibling tool or states when not to use this one.

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