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

With no annotations, the description carries the full behavioral burden, and it does disclose the most important trait: the call is paid ($0.005 via x402/USDC), which an agent must know before invoking. It does not state that the operation is read-only, how pagination/ordering works, whether the fee is per call or per record set, or what happens if payment is not settled.

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 short sentences with zero filler: the resource and its categories come first, then the cost constraint. Nothing is repeated and nothing is buried.

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 no-annotation, no-output-schema, four-optional-parameter read tool, the description covers the resource, the filter dimensions, the scoping, and the price, which is the critical decision input. Return shape details are legitimately omitted since no output schema exists but the record kinds are enumerated, though ordering and volume are unstated.

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 75%, so most parameters are already documented in the schema, and the description adds only the framing that results are filterable by date and kind and scoped to one source or all. The limit parameter and its 1-100 cap are not mentioned, and no syntax or default values are added beyond the schema.

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?

"Normalized change records (breaking, deprecation, security, release) for one tracked API/SDK or all of them" gives a specific resource and enumerates the record categories, so the agent knows exactly what comes back. It does not distinguish itself from siblings like preview_changes or digest, which sound like near-overlapping change-retrieval tools.

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?

There is no explicit when-to-use or when-not-to-use guidance relative to preview_changes, digest, or upgrade_check, which are the obvious alternatives for change data. The only routing hint is the implicit "omit source for all", which is parameter-level rather than use-case-level.

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