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

Annotations already declare readOnlyHint=false, destructiveHint=true, idempotentHint=true, but the description adds real context the annotations cannot: the update is free with no Suite run, and a new quantity re-prices the existing bill of materials. It also explains the right-sizing and performance-floor conditions (floor applied only when both current and required are supplied). It does not spell out what 'destructive' means here, so not a 5.

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 sentences, front-loaded with the updatable fields before the cost/behavior notes. Dense but each clause carries information; the long parenthetical unit list makes it slightly harder to scan.

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?

A 6-parameter nested-object mutation tool with no output schema, and the description covers purpose, cost, side effects on the BOM, and the performance-floor pair rule. Only gap is the absence of any statement about what the call returns or confirmation behavior.

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 67%, and the description largely mirrors the schema's own wording (region as target market, contents_mm as box dimensions, ECT/stiffness/top-load per material). It does add the domain framing of 'contents size (boxes)' enabling right-sizing, but adds little syntax or semantics beyond what the schema already documents.

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 (change) and resource (a Design Studio project) and enumerates exactly which fields are updatable: quantity, region, contents size, name, performance floor. It also disambiguates from read-only siblings like list_my_projects by framing this as the mutation path.

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?

Gives a concrete activation condition: 'Use it when the user gives the real volume before comparing options or requesting quotes,' which implicitly routes to compare_packaging_options/check_quote. It does not state when NOT to use it or name the alternatives explicitly, so it falls short of a 5.

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