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

With no annotations provided, the description carries the burden of behavioral disclosure. It does add value by saying the data is 'confirmed against official pages' and 'newest first', but it does not mention whether this triggers live network fetches, whether there are rate limits or caching implications, or confirm the read-only nature explicitly.

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?

The description is a single, compact phrase that front-loads the core subject and includes the most important qualifiers. There is no redundant wording or repetition of information already present in the schema.

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 simple list-like tool with three optional, well-described parameters and an output schema, the description provides enough context about the result set and its ordering. It lacks an explicit usage boundary versus siblings, but the parameter schema and output schema fill most operational gaps.

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?

The input schema already documents `since` and `provider` with descriptions, and `limit` is self-explanatory with clear constraints. The description itself adds no parameter-specific meaning, but it does not need to compensate heavily because the schema coverage is adequate for these three optional parameters.

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 description states a specific resource ('recent changes'), a clear domain ('price, plan and limit'), and a distinguishing trait ('confirmed against official pages'). It also specifies ordering ('newest first'), making the tool's purpose concrete and easily separable from siblings like compare_products or estimate_cost.

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 gives no explicit guidance on when to use this tool versus the sibling alternatives. There are no usage conditions, exclusions, or mention of alternatives. The purpose is clear, but the 'when-to-use' decision 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.