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

Annotations already cover read-only, idempotent, and non-destructive behavior. The description adds that the flow is deterministic and that an Ambassador invitation ID can be preserved, but it does not clarify behavior with invalid IDs or how the optional parameter affects the returned output.

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 one concise sentence with no filler. It front-loads the core behavior, though the word 'preserve' is slightly opaque.

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 read-only, idempotent tool with zero required parameters, the description covers the essential purpose. However, it is thin on what the returned registration flow contains and when supplying an invitation_id is useful or needed.

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 single parameter, including a regex pattern and description, so the baseline is 3. The description adds little beyond restating the parameter as a 'valid Ambassador invitation ID.'

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 action, returning the AgentWorld registration flow, and identifies it as Ed25519-based, which adds useful precision. It does not explicitly distinguish itself from sibling tools, but the resource and flow type make the purpose clear.

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 intended use is implied by the title and the phrase 'Return the deterministic Ed25519 registration flow,' but there is no explicit when-to-use guidance or mention of alternatives. An agent can infer the general use case but not when to choose this over discover_agentworld or other siblings.

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