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

With annotations already declaring mutation, open-world and destructive hints, the description adds substantial context they cannot carry: one fixed workflow charge, no internal per-step charges, challenge-instead-of-execution on unpaid calls, seven-day state retention, and no silent rebaselining. There is mild tension with idempotentHint=false, since 'exact replay returns retained results without fresh work or another charge' describes replay-safe behavior, but that is a partial nuance rather than a flat contradiction. It does not say what a seed overwrites or destroys, which is the one gap against destructiveHint=true.

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 purpose sentence is front-loaded and the remaining semicolon-separated clauses each carry distinct operational facts (auth, cost, replay, retention, limits). It is dense and telegraphic, with heavy semicolon chaining, but almost no filler.

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 paid, stateful, open-world workflow tool with no output schema, the description still covers billing model, auth, replay semantics, retention window, and the limits of the result. What is missing is a concrete sketch of the findings payload shape and any note on what destructive state change seeding entails.

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 100%, so the schema already documents url, observation_id, detail and compare_to including defaults and enum bounds, putting this at the baseline. The description contributes a little extra: detail must be fixed before authorization, and seeding reports no comparison. Most parameter meaning is already in 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?

The opening clause names a specific verb pair (seed or review) and resource (public JSON OpenAPI 3.0/3.1 contract) and scopes the output to 'directional compatibility/security findings and explicit uncertainty'. Exclusions ('No YAML, external-ref crawling or runtime compatibility proof') sharpen the boundary. It never names the adjacent siblings fresh402_openapi_contract_diff or fresh402_contract_watch, so differentiation is inferred rather than stated.

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?

It gives a clear operating sequence: first source use seeds in the same operation, later calls use the returned owned observation_id, and evidence detail must be chosen before authorization. Preconditions (auth modes, tariff 5, max_credits, no free trial, no automatic paid fallback) are explicit. It stops short of naming alternative tools, so the agent still has to infer when to pick a sibling diff/watch tool instead.

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