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

Annotations only cover the safety profile (write, non-idempotent, open-world). The description adds real behavior: two links are produced with different permissions, members pay online when pay_mode=members, the owner verifies the visual and settles the balance at deadline, and volume pricing retroactively refunds early registrants. Auth requirements and what the response payload contains are still unstated.

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?

Front-loaded with purpose and audience, then the two links in order of importance. Four dense sentences, all relevant; the closing pricing sentence is the least essential for an invocation decision but still informs the choice of tool.

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 a 14-parameter creation tool with no output schema, the description correctly tells the agent what is returned (a model plus two link URLs, one shared one private). What's missing is who can call it / what account context is required and what happens on deadline expiry — minor against 93% schema coverage.

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 already 93%, so the baseline is 3. The description goes beyond it by explaining the functional consequence of pay_mode=members (each member pays their share online) and per_piece (no static text, each piece varies), which the schema only states mechanically.

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 the group-order model plus two distinct links (members link and owner link) — and names the audience: club, class, association. This is clearly distinguishable from siblings like create_design (single design) or get_group_status (read-only tracking).

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?

The audience line plus the two-link explanation make the 'when' obvious: multi-person orders needing per-member sizes/names/numbers and split payment. It does not explicitly name alternatives (e.g. 'for a single piece use create_design') or prerequisites, so it stops short of the 5 bar.

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