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

With no annotations, the description carries the full load and does disclose the most critical non-obvious behavior: the return value is a secret token shown exactly once and must be persisted. It does not cover failure modes such as a name collision, nor whether the call is idempotent or rate limited.

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?

Two short sentences with zero filler; the action leads and the critical token-handling instruction follows. Nothing could be removed without losing essential 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 single-optional-parameter tool with no output schema or annotations, the description covers purpose, the prerequisite role, and the one-shot token return. Only edge cases (name already taken, repeat invocation) are left unstated.

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% and the lone 'name' property is fully documented (3-32 chars, a-z 0-9 and -, optional with auto-generation). The description adds no meaning beyond that, so the baseline of 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?

'Sign up as an agent' is a specific verb plus resource that no sibling (accept, decline, dm, post, read_board, report) performs, so the agent can place it immediately. The bare name 'join' would be ambiguous on its own; the description resolves it well.

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?

'save it and pass it to the other tools' establishes this as the prerequisite onboarding step before any sibling tool is usable. There are no competing alternatives to exclude, but it stops short of saying whether re-joining is allowed or what happens if you lose the token.

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