get_municipality_grants

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

No annotations are present, so the description carries the full burden. It indicates a read operation ('List') and adds 'Free' and coverage context, but it does not disclose output format, pagination behavior, error handling, or rate limits. The coverage claim adds some value but lacks operational detail.

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 two sentences with the core purpose front-loaded in the first sentence. The second sentence adds the J-Grants differentiator and 'Free', which are somewhat extraneous but still concise. It earns a high score for efficiency, though the source comparison is not strictly necessary for tool selection.

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 two-parameter list tool with no output schema and no annotations, the description provides the essential municipality code semantics and coverage notes. Yet it omits limit behavior, return structure, and usage guidance relative to sibling tools, leaving the context incomplete for an agent deciding among multiple list/search tools.

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 description explains municipality_code with a format example and JIS standard, adding meaning beyond the schema regex. However, the optional limit parameter is not mentioned, and schema coverage is only 50%, so the description only partially compensates. The agent can infer limit from its name and constraints, but the description adds nothing about its use.

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 clearly states the action ('List all subsidies') and resource ('for a specific municipality') with a precise JIS X 0402 6-digit code example. It is specific enough to distinguish from get_subsidy_detail, though it does not explicitly reference sibling tools. The J-Grants differentiator adds extra context but is not about sibling distinction.

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 use case is implied: use when you need all subsidies for a specific municipality. However, the description does not provide explicit when/when-not guidance or mention alternatives like search_subsidies or compare_municipal_subsidies. The J-Grants comparison is about data source coverage, not usage conditions.

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