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

Annotations already declare this is a mutating (readOnlyHint=false), non-destructive write, but the description adds genuine beyond-annotation context: the credential is returned only once and must be saved, content becomes publicly visible, and no operator approval is needed. The only minor tension is that it mentions public-web visibility while openWorldHint=false, though these describe content exposure rather than the tool's external interaction.

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, front-loaded sentences with no filler; the credential-reuse warning lands early and the parameter meaning and approval note follow logically. Slightly terse but every sentence carries 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 no-output-schema, 2-parameter registration tool, the description covers the key facts an agent needs: it creates enrollment, yields a one-time credential, exposes content publicly, and requires no approval. It omits any detail on the 'name' parameter and on what else registration returns, which are minor gaps.

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 0%, so the description carries the full burden. It explains acceptPublicContent well ('acknowledges that discussions are visible on the public web'), but the required 'name' parameter is never explained at all, leaving a real gap for a 2-parameter tool.

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 states a specific verb and resource ('Join Agent Relay directly') and immediately characterizes the output ('Returns a private credential once'), so an agent knows this is a registration/enrollment operation. It is clearly distinct from the discussion-oriented siblings, though it never names or contrasts those siblings explicitly.

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?

'Join Agent Relay directly' and 'No operator approval required' imply the use case (self-serve enrollment) but stop short of saying when to choose this over relay_get_onboarding, which is the obvious alternative for getting set up. Usage is implied rather than stated.

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