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

Annotations already declare the mutation profile (readOnly=false, destructive=true, openWorld=true, idempotent=false), so the bar is lower. The description still adds genuine behavioral context beyond them: retry safety via request_key, anonymous-creation limits, the claim_url the caller must surface, and plan-limit enforcement. The idempotency-via-request_key wording is in mild tension with idempotentHint=false, but this is conditional (only authenticated + only when the key is supplied) rather than a contradiction.

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?

Four tight sentences, front-loaded with the core purpose and no filler. The retry/claim_url/plan-limit clauses each carry distinct information rather than restating the schema.

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?

There is no output schema, so the description's disclosure of the returned claim_url is valuable, and it covers the authenticated vs anonymous paths plus plan limits. Gaps remain around the design/label parameters and failure modes, but for a create tool this is close to complete.

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 0%, so the description carries the burden. It clarifies destination ('public HTTP(S) destination') and request_key (UUID for safe retry), but says nothing about label or the nested design object's bg/fg color fields, leaving half the parameters undocumented in both places.

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+resource ('Create a dynamic QR code') with a real constraint baked in ('for a public HTTP(S) destination'). It distinguishes dynamic-creation from the render_qr/list_qr_codes siblings implicitly, but never explicitly contrasts them, so it stops short of 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?

Gives operational conditions – authenticated creation should pass a UUID request_key, anonymous creation is limited – which is real usage guidance. However it never names or routes to sibling alternatives (render_qr, simulate_scan, get_qr_code), so the agent must infer when this tool is the right choice.

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