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

The description adds genuine context beyond the annotations: it says submitted receipts are preserved and that active ads are untouched, which clarifies the blast radius of a destructiveHint=true call. However, it does not explain whether in-flight steps are interrupted, whether the stop is reversible, or what the caller gets back, leaving the main mutation semantics partly implicit.

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, front-loaded with the action and followed immediately by the scoping caveat. No filler or restatement of the title, and every clause carries distinct information.

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 and annotations cover safety and idempotency, so return values and safety need not be re-explained. But for a destructive, nested-object operation requiring five of six params, the description omits the operational preconditions (valid request key, catalog version, expected operation_id) that an agent needs before invoking it.

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 6 parameters and only 50% schema description coverage, the description needs to compensate and does not — it never mentions work_id, request_key, operation_id, expected_catalog_version, or read_skills. An agent gets no help on which identifier scopes the stop or on the skill-proof/version requirements that appear mandatory.

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 object ('Stop future advertising request steps'), which matches the tool name and title and is distinct from the many siblings that stop other things (stop_generation, stop_analytics_request, stop_export). It does not, however, differentiate itself from adjacent GenAds siblings like genads_ad_action or genads_ad_operation, so the agent must infer the boundary.

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?

It gives a clear exclusion: this does not pause already-active ads, and points the agent to 'the separate pause action' for that case. The guidance would be stronger if the pause alternative were named as an actual sibling tool rather than described generically, and no positive trigger (e.g. cancel a pending request before it runs) is stated.

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