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

Annotations already declare readOnlyHint=false and destructiveHint=false, so the write-but-non-destructive profile is covered. The description adds the upsert nuance ('add or update'), which is genuinely useful context beyond the annotations, but says nothing about what an update overwrites, auth requirements, or rate limits.

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 filler or repetition. It is efficient, though its terseness at 0% schema coverage is part of the completeness problem rather than a structural flaw.

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 7 required, entirely undocumented parameters and no output schema, the description is far too thin. Missing parameter semantics and missing routing guidance leave an agent without what it needs to call this correctly versus its siblings.

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% across 7 required parameters, and the description names none of them beyond a vague gesture at 'what makes it link-worthy' (the uniqueValue field). It fails to compensate for the coverage gap: url, type enum, summary, title, projectId, and siteId are all unexplained in both schema and 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 verb (add/update, i.e. upsert) and resource (a linkable asset, described as 'a page worth pitching') are present, so the core action is inferable. However, 'worth pitching' and 'link-worthy' are colloquial restatements of 'linkable asset' rather than a precise explanation, and nothing distinguishes it from siblings like add_backlink or create_backlink_submission.

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 offers no when-to-use guidance, no prerequisites, and no alternatives. 'Add or update' is the only usage signal, implicitly indicating upsert behavior, but which tool to reach for versus the many backlink/outreach siblings is left entirely to inference.

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