C1 Check

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

No annotations are provided, so the description carries the full burden. It does disclose genuinely useful behavior — the feature-flag gating and the specific 'sources_skipped / disabled_in_settings' result when disabled — but says nothing about permissions, cost, latency, or external-service dependency for the enabled path.

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 dense sentences, front-loaded with the purpose and then the gating condition; nothing is padding. The bracketed '[c1]' and 'data: {c1_best, offers}' fragments are terse to the point of being cryptic, which slightly hurts 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?

With a single parameter and an existing output schema, the description needn't explain return values, and it covers purpose plus skip behavior. It still leaves the call ordering (only after finalists are chosen) and the meaning of the returned fields implicit.

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% for the single url parameter. The description adds partial meaning by specifying 'one finalist URL', implying it must be a single previously-selected product URL rather than an arbitrary link, but gives no format, validation, or domain expectations.

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 concrete action and target — a Capital One Shopping cross-check on a single finalist URL — which is distinguishable from the sibling search/compare/extract tools. The 'c1' shorthand is jargon but the surrounding phrase makes the resource clear.

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 one usable condition ('Off unless [c1] enabled = true') and explains the fallback, which tells the agent when the call is a no-op. However, it never says when to prefer this over compare_prices or other siblings, nor that the URL must come from an earlier selection step.

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