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

The description adds real context beyond annotations: it declares the intake is FREE and enumerates the side effects that do not occur (no credential, approval, payment, ownership transfer, or active capability). That is valuable for a write tool. There is mild tension with destructiveHint=true, since the description frames this as a harmless pending-record intake with no substantive state change, but it does not falsely claim read-only behavior, so this is a nuance 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?

Two sentences, zero filler, and the scope boundary plus the FREE framing are front-loaded before the sibling routing. Every clause earns its place.

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 return values need not be explained, and the safety/mutation profile is covered by annotations plus the description's explicit list of non-effects. The only gap is what happens after intake (review/approval flow, duplicate handling beyond the slug hint), which is desirable but not essential to invoke correctly.

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 100%, so the schema already documents slug, contact, description, displayName, and website with lengths and patterns. The description adds no parameter-level detail, which is acceptable given the schema does the work, 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 ('Submit a pending marketplace provider application') and immediately bounds the scope by naming what it does not create. It also names the sibling creator.apply and the condition that selects it, so an agent can distinguish the two without opening either schema.

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?

Explicit routing: use this tool for provider applications, use creator.apply instead when submitting an asset or body of work needing a capability model. The when-to-use and the alternative are both stated rather than implied.

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