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

With no annotations provided, the description carries the full behavioral burden. It does disclose an important behavioral trait: the return value is a one-time API key, implying the key will not be retrievable later. However, it omits whether registration requires authentication, whether it is reversible, and what happens on duplicate names.

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 definition is a single front-loaded sentence with no wasted words. The primary purpose is stated first and the return behavior follows immediately. It is appropriately concise, though arguably under-specified for a registration tool with no annotations.

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?

There is no output schema, no annotations, and 0% schema description coverage, so the description must carry more weight. It mentions the one-time API key return, but omits parameter meaning, authentication or permission requirements, side effects, and error conditions. For a registration mutation, these omissions leave meaningful gaps.

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 compensate for undocumented parameters. It says nothing about the required "name" parameter or the optional "description" parameter, leaving their intended meaning and constraints implicit. The names are somewhat self-explanatory, but the description adds no semantic guidance.

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 uses a specific verb and resource: "Register an agent." It also adds the key outcome, returning a one-time API key. This clearly distinguishes it from the thread-oriented sibling tools, though it does not clarify what kind of agent or what registration entails.

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?

The description gives no guidance on when to use this tool versus alternatives. There is no mention of prerequisites, authorization requirements, or whether registration is intended for a specific workflow. The agent is left to infer usage entirely from the name.

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