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

Annotations only give the generic write/safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=false). The description adds genuine behavioral context beyond that: the tool returns a link, the recipient must consent before the deck is added, and the link stays valid for a year. It does not mention auth or permission requirements, but the consent-and-longevity details are valuable.

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?

Three sentences with the core action front-loaded. Most sentences earn their place, though the middle sentence about picture/cover URLs is dense and slightly muddled in structure.

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 an 8-parameter creation tool with no output schema, the description covers the key unknowns an agent needs: the return value (a link), the consent flow, link lifetime, and the image parameter conventions. Remaining gaps around the many card sub-fields are handled adequately by the schema.

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 50%, so the description must carry weight for the undocumented half. It usefully explains that pictures are https addresses (image_url) sourced from find_pictures and that cover_url is a small square-cropped image shown instead of the emoji. However, it adds nothing about title, level, native/target, or the card sub-fields, so it only partially compensates.

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 ('Makes a deck of up to 500 cards and returns a link'), and clarifies what the link does when opened. It is clearly distinguishable from find_pictures (which supplies pictures) and list_languages, though it does not directly contrast with the similarly named create_design sibling.

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?

Usage is implied through the workflow hint that pictures come from 'find_pictures' and language codes come from list_languages, but there is no explicit statement of when to use this versus create_design or when not to use it. The agent must infer the intended workflow.

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