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

Annotations already cover the safety profile (readOnlyHint, idempotentHint, destructiveHint=false, openWorldHint), so the bar is lower. The description still adds real context the annotations do not: the required Subscription-Key authentication parameter, and the exact shape of the two response modes (metadata vs. metadata plus results). It stops short of describing rate limits or pagination for large filing lists.

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 a raw API spec dump wrapped in 'methods'/'requestParams' JSON scaffolding rather than prose, so nothing is front-loaded for an agent. It also carries a pricing comment block that is noise for tool selection, and repeats parameter text already in the schema.

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?

An output schema exists, so return values need not be explained, yet the description spends most of its budget on response fields. With only 2 parameters and full annotation coverage, the remaining gap is the missing sibling differentiation and when-to-use guidance, leaving it minimally viable rather than complete.

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 description coverage is 100%, so the schema already documents both date and type verbatim, including the YYYY-MM-DD format and the 1/2 enum — the description largely restates it. The only genuinely additive item is the Subscription-Key parameter, which is absent from the input schema entirely.

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 embedded methodDesc states a specific verb and resource: 'Query the EDINET filing list for a given file date,' and the name get_edinet_documents matches that scope. It never distinguishes itself from adjacent siblings like edinet_filings_digest, get_financial_filings, or get_details, so an agent cannot route between them from this text alone.

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 through the type parameter semantics ('1 for metadata only, 2 for metadata plus filing list'), which tells the agent how to choose a response mode. There is no statement of when this tool should be chosen over the filing-oriented siblings, and no prerequisites or exclusions are given.

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