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

Annotations only supply destructiveHint=true, so the description adds meaningful disclosure: no password or admin flag are accepted by design, and the registration-email flow governs how the account becomes usable. It omits auth scope and duplicate-email behavior, but for a small write tool this is solid added context.

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?

Three compact clauses with the write marker front-loaded and zero filler; every sentence carries operational 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?

For a 7-parameter write with no output schema and a nested 'fields' object, the description plus the fully documented schema covers enough to invoke correctly. It lacks guidance on duplicate emails or required-field failure modes, which keeps it from a 5.

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 coverage is 100%, so the baseline is 3, but the description earns more by explaining the intent behind send_registration_email (it substitutes for a password field), which the schema's 'Send LearnWorlds' registration email' does not convey.

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+resource ('create a learner account') and immediately scopes it with 'WRITE' and the LearnWorlds endpoint. The 'no password or admin flag' clause implicitly distinguishes it from any admin-provisioning sibling and from update_user, so an agent can route correctly.

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 gives a real usage instruction — set send_registration_email so the learner sets their own password — but offers no when-to-use vs. when-not guidance and never names an alternative sibling such as update_user or add_user_to_group. Implied usage only.

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