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

Annotations already declare readOnly/not-destructive/idempotent/closed-world, yet the description still adds real behavioral context: no physical print job, no account data stored, overflow is rejected, and the exact return artifacts (printUrl, editUrl, sheet JSON). That is meaningful disclosure beyond the structured hints.

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 dense sentences, purpose front-loaded in the first clause, and every subsequent sentence adds a distinct fact (scope, outputs, error behavior, layout rules). No filler or redundancy.

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 8 parameters, no output schema, and 0% schema description coverage, the description does the necessary work: it explains the return shape and the layout/copy semantics that the schema cannot. The unmentioned enums (template IDs, fonts) are the only notable gap, and those are largely self-describing.

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 0%, so the description carries the full burden and only partially compensates. It adds genuine semantics for labels (empty strings = blanks), copies (consecutive repetition), and positioning (1-based, row-major), but says nothing about template, fontSize, fontFamily, qrEnabled, or name.

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 ("Create one printable sheet") plus the additional artifact (editable share link) and the input (plain label text). The function is readily distinguishable from the sibling list_label_templates, but that alternative is never named, so sibling differentiation is implicit rather than explicit.

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 some operative guidance ("Use empty strings for blank slots", "Does not submit a physical print job") and clarifies the non-persistent scope, but never states when to prefer this over other tools or what preconditions exist. Enough to invoke correctly, not enough to route confidently.

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