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

Annotations declare readOnlyHint=false and openWorldHint=true, so the safety profile is partly provided. The description adds two genuinely useful behavioral facts—'no pagination or extra lookup' and 'unknown costs remain unapproved' (pricing/permission gate)—but wraps them in internal governance jargon ('no new independent authority fact is claimed') that does not help the agent.

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?

Five short sentences, but several do not earn their place: 'No new independent authority fact is claimed' and 'Unknown costs remain unapproved' are policy boilerplate rather than agent-facing guidance, and the actual purpose is never front-loaded.

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-required-target, nested-object, no-output-schema tool with 0% schema coverage, the description omits the comparison semantics, what the bounded result set contains, and how target1/target2 interact. Only the absence of pagination and the limit bound are conveyed.

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 0% and the nested target1/target2 objects with their kind enum are entirely unexplained by the description. 'Domain and page' loosely echoes the DOMAIN/PAGE enum and 'bounded' loosely echoes the limit maximum, but the two required targets and the comparison semantics are left to inference.

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 mentions 'domain and page rank values from the Nexscope backlink index' but never explains the core concept in the tool name: the intersection of backlinks between two targets. An agent cannot tell what result it is getting (common referring domains? shared pages?) from this text, and it reads more like an authority-rank tool than an intersection tool.

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 gestures at a relationship to 'backlink overview' but gives no condition for choosing this tool over nexscope_seo_backlink_page_intersection or nexscope_seo_backlink_authority_ranks. No when-to-use or when-not-to-use guidance is present.

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