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

readOnlyHint=true already establishes the safety profile, so the description's job is lighter. It adds real value by disclosing the fields returned and the cross-tool linkage to CHECKFRONT_ON_BEHALF, though it says nothing about pagination, account size limits, or permission requirements.

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?

Three short sentences, front-loaded with the purpose and scoped fields. The trailing API route reference ('Checkfront: GET /api/3.0/account.') is mildly redundant but harmless and consistent with the API-documentation convention.

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?

There is no output schema and no parameters, so the description must carry the return-value burden itself — and it does, listing the fields an agent will receive. The lack of any note on result size or pagination is the only meaningful gap for a simple read-only listing.

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?

Zero parameters, so the baseline is 4 with no schema semantics to explain. The description correctly spends its space on the output shape instead of inventing parameter guidance.

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 specific verb and resource with scope ('staff (and partner) accounts on the Checkfront account') and enumerates the returned fields (ids, names, emails, login ids, enabled). This clearly distinguishes it from siblings like checkfront_get_company or checkfront_search_customers that also deal with people.

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?

Gives a concrete reason to call it: 'The account_id is what CHECKFRONT_ON_BEHALF takes', tying this listing to a downstream parameter an agent needs. It does not state when not to use it or name an alternative, so it stops short of full routing guidance.

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