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

Annotations already declare this a readOnly, idempotent, non-destructive, open-world operation, so the safety profile is fully covered. The description adds the scope of state it surfaces (membership, migration, authorization, next steps), but does not mention any access requirements, freshness/caching behavior, or what an unverified/new agent sees. Since an output schema exists, the field enumeration is useful orientation rather than essential 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?

A single dense sentence with the core purpose front-loaded and the sibling comparison appended, so nothing is buried. The list of returned facets is slightly enumerative and reads close to a restatement of the output schema, but it is compact enough not to be wasteful.

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 zero-parameter, read-only, self-scoped tool with a full output schema and rich annotations, the description covers purpose, scope, and sibling routing adequately. The only gap is the absence of any hint about what state a brand-new or unlinked agent would report, which would help first-call interpretation.

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, which is the baseline-4 case: there is nothing for the description to disambiguate. The description does implicitly confirm self-scoping ('this agent's identity'), so an agent understands no identifier argument is required.

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 opens with a specific verb+resource ('Read this agent's identity state') and then enumerates the exact facets returned: stored membership, verification/migration state, creation authorization, next steps, and identity links. It also explicitly positions the tool against the sibling problee_get_me, so an agent can distinguish the two without opening either 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?

It gives clear situational context by saying the tool is 'richer than problee_get_me for identity linking', which tells an agent to prefer it when link/membership detail is needed. It stops short of explicit when-not guidance or naming what get_me should be used for instead, leaving some inference.

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