register

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

No annotations are provided, so the description carries the transparency burden. It discloses the key return value (API key with cpk_ prefix), the free quota (10 extractions/day), and the prerequisite relationship. However, it does not mention potential side effects like account creation confirmation or what happens if the email is already registered, but for a simple registration tool this is reasonably transparent.

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 description is two sentences, front-loaded with the purpose, then key details about the return value and prerequisite. Every sentence earns its place with no waste.

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 the simplicity of a one-parameter registration tool with no output schema, the description is complete: it states the purpose, the return value format, the free quota, and the prerequisite for another tool. No critical information is missing for an agent to decide and invoke it correctly.

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 schema covers 100% of the parameter (email) with a description 'Email address for the account'. The tool description adds no additional parameter-specific meaning beyond what the schema already provides. Baseline 3 is appropriate given the high schema coverage.

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 clearly states 'Register for a ClawPage account' with a specific verb and resource. It also distinguishes itself from siblings by noting it is 'Required before using extract_url', which uniquely positions this tool in the workflow.

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 explicitly states when to use this tool: 'Required before using extract_url'. This is clear usage context, though it does not mention alternatives or when not to use it. Since it is a registration prerequisite, this is sufficient guidance.

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