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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description adds nothing beyond that structured data — no note on behavior when the ID is absent, no scope or permission context, no indication of what is returned.

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?

One short, front-loaded sentence with zero filler, appropriate for a trivial getter. It is arguably too terse to be maximally useful, but nothing in it is wasted.

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 simple read-only getter with complete annotations, a fully covered schema and no output schema to explain, the description is minimally sufficient. It omits not-found/error behavior and any routing to list_asset_placements, so it is adequate rather than complete.

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?

With a single parameter at 100% schema description coverage, the schema fully documents the UUID 'id', and the description's 'by ID' merely echoes it. Baseline 3 applies since the schema does all the work and the description adds no format, constraint, or lookup nuance.

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 ('Get') and resource ('a single asset placement') with the lookup key ('by ID'), so the operation is unambiguous. It does not, however, distinguish itself from the sibling list_asset_placements, which an agent must infer is the multi-record counterpart.

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 only implied: 'by ID' suggests the tool is for when a placement ID is already known, and the plural sibling list_asset_placements is the natural alternative for retrieval without an ID. Neither the when-to-use nor the alternative is stated explicitly.

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