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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, covering the safety profile. The description adds only 'Free' as a behavioral trait; it omits auth requirements, rate limits, and error behavior. The enumerated return fields are output documentation rather than behavioral disclosure.

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?

One front-loaded sentence; the field list is dense but earns its place because there is no output schema. No filler.

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-by-id tool with a fully described parameter and clear annotations, the description supplies the missing return-field inventory and cost note. Nothing essential to invoking it correctly is absent.

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 coverage is 100% and the single accountId parameter is already documented as a UUID. The description's 'by id' adds no syntax or format detail beyond the schema. Baseline 3 when the schema does the work.

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: 'Fetch one managed account by id', and it distinguishes itself from list_managed_accounts by scope ('one') and from capacity/pulse siblings through the enumerated return fields. An agent can tell what the tool returns without opening another schema.

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 implied (call when you have an accountId and need its details) and 'Free' adds a cost consideration, but no explicit when-not or named alternative is given. Alternatives like list_managed_accounts or get_managed_accounts_pulse are not mentioned, so selection relies on inference.

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