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

Annotations already declare readOnly/idempotent/non-destructive/closed-world, so the safety profile is covered; the description adds the required API-key scope (`users:read`), which is genuinely useful pre-call context. It does not discuss failure modes (the account-selection error is only in the schema) or response shape beyond the field list.

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?

Two sentences, zero filler: the first front-loads what is returned, the second front-loads when to use it, with the auth scope appended as a terse trailing tag. Well structured and appropriately sized for a simple read 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?

With no output schema, the description usefully names the return fields, and it covers the required scope. For a zero-required-parameter read tool with fully documented params, this is nearly complete; the only minor gap is the lack of any explicit mention of the multi-account selection path surfaced in the schema.

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 `workspace` parameters (including the ACCOUNT_REQUIRED failure behavior) are fully documented in the schema. The description adds no parameter-level meaning of its own, so the baseline 3 applies.

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?

Uses a specific verb ('Get') and resource ('profile of the human behind the API key') and enumerates the returned fields (identifier, email, fullName, userSettings). It is clearly distinct from pm_update_current_user by verb, though it never explicitly names that sibling or whoami/find_my_workspace to disambiguate.

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 three concrete triggering scenarios (address user by name, route a notification to a preference channel, confirm whose API key it is), which is real when-to-use guidance. It stops short of explicit when-not-to-use or naming the alternative tool for identity/workspace lookups.

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