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

With no annotations provided, the description carries the full burden and falls short. It does not disclose whether registration overwrites an existing identity, whether the call is idempotent, what permissions are required, or what happens if the agent_id already exists.

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 single short sentence is front-loaded and free of padding, which is structurally good. But it reads as under-specification rather than true conciseness, since so much essential information is absent.

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?

Given no annotations, no output schema, and 0% parameter description coverage, the definition is not complete enough for an agent to invoke it confidently. Missing are the distinction between the two verbs, the role parameter's meaning, and any return or error behavior.

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 0%, so the description must explain both parameters. It implies agent_id from 'agent identity' but provides no guidance on the 'role' parameter at all, leaving half the inputs undocumented. The description does not compensate for the coverage gap.

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 a resource (agent persistent identity) and two possible verbs (register/retrieve), so the general domain is clear. However, it does not say which operation actually occurs or when, and the dual 'register or retrieve' phrasing leaves the core behavior ambiguous. It also draws no distinction from siblings like budget_enforce or lawful_check.

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?

There is no statement of when to call this tool, what prerequisites exist, or how it relates to the sibling tools. An agent must infer everything about timing and context from the name alone.

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