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

Annotations already declare destructiveHint=true, idempotentHint=true and readOnlyHint=false, so the safety profile is covered; the description still adds real context beyond them: the approval gate and the post-deletion consequence that the engine falls back to plan defaults. It stops short of 5 by not covering failure modes or whether the rule can be restored.

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 compact sentence with the action front-loaded and the consequence and approval requirement packed in without padding. The bracketed '[publish]' tag is unexplained but does not cost readability.

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 two-parameter destructive tool with no output schema, the definition covers the essential facts an agent needs: what is removed, how to identify it, that approval is required, and what happens afterwards. Only identifier format and the requirement that at least one identifier be supplied are missing.

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 0% and both parameters are nullable with no defaults documented, so the description must compensate. It does add the key either/or meaning by writing '`ads_rule_id` or `ads_rule_uuid`', but it never states that one of them must actually be supplied or gives expected formats, leaving a real ambiguity in a schema where zero required fields exist.

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 ('Delete an ad monitoring rule') and names the two accepted identifiers, which clearly separates it from create_ads_rule, edit_ads_rule and list_ads_rules. The '[publish]' prefix is unexplained, and no sibling is named explicitly, so it stops short of a 5.

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 description implies usage (remove a rule that is no longer wanted) and states a hard precondition, 'Requires human approval', which is actionable. It never says when to prefer deletion over editing/deactivating a rule, and gives no guidance on when a rule should be kept.

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