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

The description's "Creates or updates" is consistent with idempotentHint=true and corroborates the mutation implied by readOnlyHint=false. However, it never explains why destructiveHint=true — an agent gets no warning that an existing QR code's settings or design may be overwritten — and says nothing about the openWorldHint implications.

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 tight sentences with the use-condition front-loaded and the behavioral effect plus return value following. No filler, nothing repeated from the title.

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?

An output schema exists, so the return value needn't be detailed (the ID mention is a bonus), and the schema fully covers both parameters. The only meaningful omission is an explanation of the destructive/overwrite behavior flagged in annotations.

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%: page_id already carries "Landing page ID from `list_link_pages`. Never guess an ID." and options documents name, project ID, format and colours. The description adds no parameter-level meaning beyond what the schema supplies, 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?

States a specific verb and resource ("Creates or updates the page's dynamic QR code") scoped to landing pages. The precondition "a published landing page that already has a short link" implicitly separates it from create_static_qr_code, generate_qr_code, and create_launchpad_qrcode, though it never names those siblings outright.

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?

"Use this when the user wants a QR code for a published landing page that already has a short link" gives an explicit trigger plus two prerequisites (published, short link exists). It stops short of stating when not to use it or which sibling to pick instead for a non-landing-page QR code.

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