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

The annotations declare readOnlyHint=false, which is at odds with a pure listing operation; the description does nothing to explain what the tool does that is non-read-only, nor what permissions it needs. Beyond ordering ('newest first'), it adds little behavioral context such as result volume limits or whether all records are returned when no filters are supplied.

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?

One dense sentence that front-loads the verb, resource, and sort order, then the returned fields, then the filters. Every clause carries information, though the field enumeration makes the middle section slightly list-like for an agent that mostly needs the filters.

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 enumeration of returned fields (id, supplier, dates, status, currency, total) is genuinely useful and largely compensates. However, there is no limit or pagination parameter and the description says nothing about result size or truncation, which matters for an unfiltered list on a schema with zero required 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 description coverage is 100%, with date formats, the enum, and the 'all' default all documented in the schema itself. The description only restates the three filter dimensions, adding no semantics such as inclusive/exclusive date bounds or supplier matching behavior beyond what the schema says.

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 ('List purchase orders') plus the sort order ('newest first'), which no sibling name conveys. It does not explicitly distinguish itself from purchase_order_get or purchase_order_receive, so an agent must infer that this is the multi-record read.

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 names the three filter dimensions (status, supplier, date range) and enumerates the status values, which implicitly tells the agent how to narrow results. It never states when to prefer purchase_order_get for a single order or purchase_order_receive for receiving, and gives no guidance on omitting filters entirely.

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