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

The readOnlyHint annotation already establishes that this is a safe read operation, and the description adds useful behavioral context by stating that it returns account_id, name, and role for room members. It does not cover pagination or error behavior, but for a simple read tool the added return-field detail is meaningful.

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 no wasted text, and the core purpose is front-loaded before the downstream usage hint. It is appropriately sized for a simple list tool.

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 read-only listing tool with full schema coverage and no output schema, the description is nearly complete: it states the resource, the returned fields, and a practical follow-up use. It could be slightly stronger by noting whether results are paginated or whether all members are returned.

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 both the account and room_id parameters are already documented in the schema. The description does not add syntax or constraints beyond that, so the baseline of 3 is appropriate.

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 states a specific verb and resource: list the members of one Chatwork room, and even names the returned fields (account_id, name, role). It is clear, but it does not explicitly distinguish this tool from nearby siblings such as list_chatwork_reply_candidates or list_chatwork_rooms.

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 description gives a downstream use case ('Use the account_id with create_chatwork_draft reply_to or [To:account_id] mentions'), which implies why an agent would call it. However, it does not say when to choose this tool over sibling listing tools or mention any exclusions or prerequisites.

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