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

readOnlyHint=true already tells the agent this is a safe read, so the description carries a lighter burden. It adds that the same endpoint answers for assets, inventory items, and asset stock, which is meaningful behavioral scope, but says nothing about return shape, date formatting, or whether past and future bookings are both included.

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 short sentences with the purpose front-loaded and no filler. The raw endpoint path 'GET /assets/<ASSET#>/booked_dates.api' is of marginal value to an agent that already has a typed schema, but it is harmless and compact.

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?

For a single-parameter read tool this is close to sufficient, and annotations cover the safety profile. However, with no output schema, the description should say what the returned dates look like (list of date pairs? ranges?), which it leaves unspecified.

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 100%, so the schema already documents asset_number as the Asset# and enforces its type/pattern. The description adds a small but real clarification that this ID may refer to an asset, an inventory item, or asset stock, which goes beyond the schema's 'item number' phrasing. 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?

The description names the resource (booked/reserved dates) and the entity it applies to (asset, inventory item, or asset stock), so an agent knows exactly what it retrieves. It does not contrast with neighbors such as get_asset_history or get_asset, 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?

There is no statement of when to call this versus alternatives, no prerequisites, and no mention of what the date range or output covers. The agent has to infer usage entirely from the one-line purpose.

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