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

With no annotations, the description carries the disclosure burden, and it does add two useful facts: the returned field is feed_status and the feed is free (no cost/credential implication). It does not state whether the call is read-only, rate limited, or what the possible status values mean, but for a zero-parameter status probe the remaining risk is low.

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?

A single front-loaded sentence with zero filler; the resource and the returned field come first. The trailing 'Free.' and parenthetical are slightly telegraphic, but nothing is wasted.

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 zero-parameter, no-annotation tool with no output schema, the description covers what it returns and its cost, which is most of what an agent needs. It falls short on how to interpret feed_status values and whether the health check is global across FSA/BOJ/MOF or reported per source.

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 tool takes no parameters, so there is nothing for the description to disambiguate; baseline 4 applies. The parenthetical naming of feed_status is a minor bonus in signalling the response field even without an output 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?

States a concrete resource and outcome: feed health (feed_status) of Japan Authority Updates, and names the covered sources (FSA, BOJ, MOF). This is clearly a diagnostic status check rather than content retrieval, which implicitly separates it from siblings like jp_authorities_latest or jp_authorities_search, though no sibling is named explicitly.

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 only implied: an agent can infer this is a pre-flight/diagnostic check on the Japan authorities feed, but the description never says when to call it versus the other three jp_authorities_* tools, nor whether it should be run before or after them.

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