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

With no annotations, the description carries the full behavioral burden. It usefully discloses the pay-per-check billing semantics and the exact cost ($0.001 USDC on Base via x402), which is genuine value. However it never explains what a 'change outcome' contains, whether authorization is required, or error/edge behavior, leaving a meaningful gap.

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?

Three tight sentences with the core function front-loaded and the cost/payment detail following. No filler, though the payment sentence could be more compact.

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 mutation-like detection tool with no annotations, no output schema, and 0% schema description coverage, the description covers billing but leaves the return contract ('change outcome') and authorization requirement underspecified. It is adequate but incomplete.

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%, so the description must compensate. 'Previous_hash' is clarified as a 'baseline content hash', which adds semantic meaning beyond the opaque string bounds (32-128) in the schema, and 'public URL' maps to url. It still omits the hash algorithm/format, so it only partially compensates.

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 ('Return a deterministic change outcome for a public URL') and names the key input (baseline content hash), so the agent understands this detects content changes. It does not explicitly differentiate itself from close siblings like detectWebpageChange or monitor_webpage_change, so it falls 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 pricing/charging sentence ('Charged per authorized check, not only when changed') implies the usage context and cost model but never states when to prefer this over the sibling change-detection tools. Usage is only implied by the purpose statement.

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