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

With no annotations, the description carries the full burden and does reasonably well: it declares the auth requirement (ExtensionDash account), the failure-reporting behavior (failed fetch shows as failure rather than a missing position), and result ordering. It omits pagination/limits behavior and any rate or cost details, keeping it short of a 5.

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?

Front-loaded with the core behavior and consumed efficiently, though the signup/reconnect paragraph is fairly verbose for a definition. Every section is relevant, but the auth-recovery instructions could be tighter.

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?

No output schema or annotations exist, so the description is the main source of context, and it covers auth, ordering, content, and failure semantics for a read-only listing tool. Remaining gaps (pagination, empty-result behavior) are minor.

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 67% and the schema already documents limit defaults, the status enum, and extension_id. The description adds only the loose implication of 'your own extensions' scoping and does not clarify status/limit semantics, so it roughly matches the structured baseline.

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+resource (recent scrape attempts against your extensions) plus ordering ('newest first') and returned content ('outcome and any error'). It also scopes the resource further by saying it covers both listing fetches and rank fetches, which separates it from siblings like get_keyword_ranks.

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?

Gives a concrete usage moment ('Use this after add_keyword to watch the rank fetch') and names alternatives for the unauthenticated case (find_listing, get_store_listing). It does not state an explicit when-not-to-use, but the alternative routing is clear enough for selection.

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