register_agent

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

With no annotations, the description carries the full behavioral burden; it does disclose one meaningful trait — an API key is issued and sent via email, implying an outbound side effect and a persistent account. It omits whether registration is idempotent, what happens on a duplicate email, whether the key is also returned in the response, and any rate limits or auth requirements.

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 front-loaded sentence with the action first and the benefit second, and no wasted wording. It is perhaps too terse given the undocumented parameters, but nothing in it is redundant.

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?

The tool is simple (three flat parameters, no nested objects, no output schema), so the description covers the core intent adequately. However, with 0% schema coverage it should explain the two remaining parameters and whether the key arrives only by email or also in the response, which it does not.

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% across three parameters, so the description must compensate and largely fails: it only hints that 'email' is a delivery address. It says nothing about 'agent_name' (identifier? display name? must it be unique?) or 'use_case' (free text? required for eligibility?).

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 gives a concrete verb and resource ("Register an agent") plus the outcome (a free Rubric developer API key delivered by email), which is far more informative than the bare tool name. It does not, however, distinguish this from sibling tools like agent_record or attest, leaving the agent to guess which registration/record path applies.

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 guidance on when to call this versus agent_record, attest, or verify, nor on prerequisites such as whether the caller must be unregistered already. The only implied usage is 'you want an API key', which is left for the agent to infer.

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