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

Annotations already flag destructiveHint=true, non-idempotent and non-readOnly. Beyond that, the description discloses a side effect (the order total is recomputed), the state restriction with a verbatim 409 CONFLICT message, and what the result echoes. This is substantive context the annotations do not carry.

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 critical constraint is front-loaded immediately after the purpose statement, and each sentence carries information. The verbatim error-string quotation is slightly verbose but justified as it tells the agent exactly what a 409 means here.

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 destructive mutation with no output schema, the description covers the mutation effect, the guard condition, parameter sourcing, and the return behavior ('echoes the operating workspace'). An agent has what it needs to call it correctly; only the absence of sibling cross-references leaves a small 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 coverage is 100% and the schema already documents both parameters, including their provenance ('returned by get_order', 'returned by list_orders or create_order'). The description largely repeats that sourcing hint via get_order, adding little beyond the schema, so the 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 opens with a precise verb+resource ('Remove a line item from an order'), which is inherently distinguishable from sibling tools add_order_item, update_order_item, and update_order_status. An agent can identify the operation without opening any 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?

It states an explicit precondition ('Only allowed while the order is pending or confirmed') with the exact failure mode, and directs the agent to get_order to source the parameters. It stops short of naming sibling alternatives (e.g., update_order_item) for other line-item changes, so it is strong but not fully comparative.

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