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

Adds substantial behavior beyond the annotations: a 24-second time limit, a 7-of-8 correctness threshold, and the critical fact that the API key is returned exactly ONCE. It also prescribes secure handling (ARANI_API_KEY in a secret store, never in logs/commits), which the annotations do not convey.

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?

Front-loads the core constraint (one call, 24 seconds, 7/8 correct) and the return behavior, with no filler. It is dense and slightly crammed into two long sentences, but every clause carries actionable information.

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?

With no output schema, the description correctly compensates by explaining the return value (API key once) and the three next steps. For a one-shot, non-idempotent registration tool, nothing an agent needs to call it correctly is missing.

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 100%, so the schema already documents all 8 parameters. The description reinforces the answers map format with an example and mentions the profile, but adds little beyond what the schema provides, so the baseline 3 applies.

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?

States a specific verb and resource ('complete_registration', submit all 8 task answers plus profile) and clearly distinguishes itself from the sibling begin_registration by naming challenge_id as its input and the API key as its output.

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?

Gives concrete usage conditions: all 8 tasks in ONE call, within 24 seconds, 7 of 8 correct, and points to get_my_profile as a follow-up. It does not explicitly state the prerequisite ordering versus begin_registration beyond the schema's 'challenge_id from begin_registration', so it stops short of full when/when-not guidance.

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