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

Annotations only cover read-only/open-world, yet the description discloses data provenance (own version records, since MOF publishes only the current list), the history floor at tracking_since, the 30-day free window with clamping semantics, and the per-change payload. These are exactly the behavioral traits an agent cannot get from structured fields.

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?

Front-loaded with the core question, then progressively denser qualifications about provenance, history, and windowing. Every sentence carries content, though 'Reference relay only' is a terse fragment whose payoff is unclear.

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?

With an output schema present, return values need not be spelled out, and the description still hints at the change fields. Provenance, history limits, and windowing are all covered; only explicit routing relative to the sibling tools is missing.

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 baseline is 3, but the description adds real meaning for `since`: earlier values are clamped to the 30-day window and history is bounded by tracking_since. It also frames limit/filters implicitly through the change payload, slightly exceeding 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 sentence names the specific resource (Japan MOF asset-freeze list), the operation (changes since a date), and enumerates the change kinds. It is unmistakably distinct from siblings like sanctions_screen_name (name screening) and catalog.

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?

Usage is implied by the question framing and the 'since' requirement, but there is no explicit when-to-use guidance, no statement of when this is preferable to sanctions_screen_name or catalog, and 'Reference relay only' is opaque rather than directive.

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