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

With no annotations, the description carries the burden and does reasonably well: it discloses the auth model (free, no email, no password), the credential's scope (unlocks both memory and registry), and a critical behavioral trait — 'it is shown once' — which warns the agent the key is not retrievable later. It stops short of saying whether registration 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?

Three short sentences, zero filler, and the most decision-relevant facts (free, no auth, dual-purpose key, shown once) are all front-loaded.

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 one-optional-param tool with no output schema, the description conveys what the agent gets (an api_key), its scope, and the one-shot display caveat, which is the key operational fact. Minor gaps remain: no mention of the response field name or whether calling again issues a new key.

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% and there is only one optional parameter ('label' as optional label/handle), so the schema already covers it. The description adds nothing about the label's purpose or format; 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+resource ('Get a free api_key for Genesis') and immediately qualifies the scope with '(no email, no password)'. An agent can distinguish this onboarding tool from the memory_* and registry_* siblings without opening any schema.

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 description explains the payoff for calling it ('One key unlocks both agent memory (remember/recall) and the trust registry (post/verify claims)'), which implies this is the prerequisite step before those sibling tools. It doesn't explicitly say 'call this first' or name exclusions, but the context is clear.

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