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

Annotations already declare readOnlyHint, idempotentHint, non-destructive, and openWorldHint=false, so the safety profile is covered. The description adds useful context that this is static configuration metadata for sign-in (issuer, discovery URL, scopes, PKCE, callback), but does not say whether the call requires authentication or whether values vary per environment.

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 substantive sentence is front-loaded and lists the returned fields compactly. The trailing 'Served by Profullstack (https://...)' line is boilerplate that adds no decision-relevant information, costing a point.

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 no-parameter, read-only configuration tool with full annotation coverage, the description is sufficient: it says what fields come back, which is the only thing an agent needs to decide. No output schema exists, but the enumerated fields effectively cover the return shape.

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 zero parameters, so the schema has nothing to explain and the baseline is 4. The description correctly frames it as a parameterless lookup of a fixed configuration record.

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 names the concrete resource and payload: CoinPay OAuth (OIDC) issuer, discovery URL, scopes, PKCE, and callback path for any Profullstack service. That is more specific than the title alone and distinguishes it from sibling getters like fleet_get_service. It stops short of stating a verb like 'returns' for the whole record, but the content is unambiguous.

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 by 'How to sign in to any Profullstack service' — an agent can infer this is the pre-authentication lookup. There is no explicit when-to-use versus fleet_get_service or fleet_list_services, and no statement of prerequisites such as whether a token is needed to call it.

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