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

No annotations are provided, so the description must carry the full burden of behavioral disclosure. It implies a mutation (binding) but does not explain side effects, permission requirements, reversibility, or what happens if the key already exists. The note about 'Unsigned' is the only behavioral hint, leaving much unspecified.

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 sentences, no wasted words. However, the second sentence ('Unsigned for key-named owners: the name is the key.') is cryptic and may confuse rather than clarify. Still, the description is appropriately short.

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?

Given three parameters, no annotations, and no output schema, the description is far from complete. It does not explain the purpose of each parameter, the outcome of binding, or any prerequisites. An agent would struggle to call this tool correctly without additional context.

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 must compensate. It mentions 'ed25519 public key' for publicKey, but does not explain the meaning of 'owner' (account? key-name?) or the optional 'label'. This leaves the agent guessing about required formats and semantics.

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 clear verb and resource: 'Bind an ed25519 public key to an account.' This distinguishes it from listing tools like list_keys, though it doesn't explicitly name alternatives. The cryptic second sentence adds a condition but the core purpose is unambiguous.

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?

No guidance on when to use this tool versus alternatives like list_keys or other account management tools. The note about 'Unsigned for key-named owners' hints at a special case but does not provide clear context on when to choose this tool.

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