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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description does add one genuine behavioral detail beyond that — the email is returned masked, a privacy trait the agent would not otherwise know — but says nothing about response shape or freshness of the account dates.

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?

A single short sentence front-loads the resource and then lists the returned fields; nothing is padded or redundant. The fragment style is slightly terse but costs no comprehension.

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 and no parameters, the description carries the load of telling the agent what comes back, and it does so by naming the four fields. The only gap is that it does not clarify the boundary with the 'accounts' sibling, which matters in this family of tools.

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 per baseline there is no parameter semantics burden to discharge. The description correctly implies a no-argument call by framing the result as the caller's own identity.

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 identifies the resource precisely as the caller's own SignalForge user record and enumerates the returned fields (id, plan, masked email, account dates). It is clear what the tool does, but it does not contrast with the sibling 'accounts', which an agent could plausibly confuse with fetching user/account profile data.

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: 'Your ... user' suggests it returns the authenticated caller's identity rather than a list of accounts, which is a soft disambiguation from the 'accounts' sibling. There is no explicit statement of when to call this instead of 'accounts' or any prerequisite context.

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