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

With no annotations, the description does carry real weight and it delivers on the payment dimension: explicit price ($0.01), asset/chain (USDC on Base eip155:8453), and the exact payment carrier (params._meta["x402/payment"]). But the core behavioral mechanic of a watch tool — where 'last call' state lives, whether it is keyed to q, and what the diff response contains — is entirely undisclosed.

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 short sentences, front-loaded with the purpose before the commercial/transport details. The HTTP endpoint string is somewhat machine-facing filler, but nothing is repeated and the ordering is sensible.

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 stateful watch tool with one undocumented parameter, no annotations, and no output schema, the description omits the essentials: how the schedule is established, what state is retained between calls, and what shape the change report takes. The commercial details are complete but the functional contract is not.

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% and the single parameter q is never mentioned in the description, so nothing explains whether q is a company name, domain, ticker, or entity ID. The description spends its words on pricing and transport instead of compensating for the undocumented parameter.

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 pattern (re-screen) plus resource (a company) and the behavioral payoff (report what changed since the last call), which is more informative than the tautological name-echo. It does not, however, distinguish itself from the sibling company_facts__lookup or company_facts__snapshot, so an agent cannot tell from the text alone why to pick this over the plain lookup.

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?

Implies recurring use ('on a schedule') but never says when to prefer it over company_facts__lookup, lookup_batch, or the other *__watch siblings, nor how the schedule is actually configured. There are no exclusions or prerequisites, leaving the when-to-use decision to inference.

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