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

Annotations already indicate a safe read operation. The description adds useful behavioral context by disclosing the $0.10 cost and required API key, and by noting the chronological ordering of results. These details go beyond the structured annotations.

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?

The description is a single front-loaded sentence with a useful parenthetical for cost/auth. There is no fluff or redundant repetition of the tool name or title.

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 one required parameter, an output schema, and read-only annotations, the context is mostly sufficient. The description adds cost/auth and ordering behavior, though it could be more explicit about the inventory_id parameter and when to use this tool over siblings.

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 0%, so the description must compensate for the undocumented inventory_id parameter. It only refers to 'an item,' which provides minimal semantic context and does not explain the ID format, source, or relationship to get_inventory_item. The parameter name helps, but the description leaves most of the burden unmet.

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 the tool returns a 'Chronological valuation history for an item,' which is a clear resource and scope. It does not explicitly contrast with siblings like get_inventory_item or add_inventory_valuation, but the word 'history' distinguishes it reasonably well.

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 intended use is implied: an agent needing valuation history for an inventory item would choose this tool. However, there is no explicit guidance about when to prefer it over related tools such as get_inventory_item or add_inventory_valuation.

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