ebay_update_ad_group

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

Annotations (readOnlyHint=false, idempotentHint=true) already declare this is a mutating, idempotent operation, and the description does not contradict them. However, the description adds zero behavioral context beyond a restatement of the name — it does not disclose whether the update is partial or full replacement, what happens to unspecified fields, or any auth/scope needs.

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?

A single, front-loaded sentence with no wasted words. It is suitably brief, though 'through the eBay Marketing API' adds little beyond the ebay_ name prefix; the brevity is efficient rather than bloated.

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 mutation tool with a nested request body and no output schema, the description is far too sparse. It does not clarify update semantics (patch vs. full replacement), valid values for adGroupStatus, bid value/currency formats, or that only the listed request fields are updatable — leaving an agent to rely on a schema whose own descriptions are mostly restatements.

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 baseline is 3 even though the description itself adds nothing about parameters. The schema's own parameter descriptions are tautological ('adGroupId required endpoint parameter'), and the request body fields (name, defaultBid, adGroupStatus) have no semantic explanation, but that gap belongs to the schema rather than the description.

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?

The description states a specific verb and resource ('Update ad group') with an API context, so an agent can tell it modifies an existing ad group rather than creating or fetching one. However, it does not explicitly differentiate itself from closely related siblings like ebay_create_ad_group or ebay_update_ad_rate_strategy; the name alone carries that distinction.

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?

No when-to-use guidance is provided: no mention that this applies to already-created ad groups, no prerequisites (e.g., that the campaign and ad group must exist), and no exclusions or alternatives. The agent is left to infer usage entirely from the name and the required parameters.

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