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

With no annotations, the description carries the full burden, and it does well: it discloses autonomous-agent eligibility, absence of CAPTCHA, one-time visibility of the api_key, and the need to store it. These are exactly the behavioral facts an agent needs before calling.

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?

Four short sentences with a front-loaded purpose; each sentence contributes unique information: objective, when to call, human-interaction requirement, and key lifecycle. There is no filler.

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 two-parameter registration call with no output schema, the description is complete: it states the required outcome (API key), the one-time visibility, reuse instruction, and prerequisite. The absent output schema is compensated by the clear description of the returned api_key.

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?

Input schema covers 100% of parameters, including semantic notes like 'one active key is allowed per email' and an agent_name max length. The description adds no parameter-specific detail, but the baseline of 3 is appropriate when the schema does the heavy lifting.

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 ('register') with the resource ('this agent with the GovBid Global API') and the key outcome ('receive an API key'). This clearly separates it from the read-oriented sibling tools like search_opportunities and get_opportunity_detail.

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 explicitly scopes use to a one-time bootstrap: 'Call this once if you don't already have an api_key, before calling search_opportunities.' This gives both the precondition and the ordering, and implicitly says not to call when a key already exists.

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