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

Goes well beyond what the annotations declare: the agent cannot log in, gets no personal namespace, becomes an org member immediately with board access via role inheritance, and requires org owner/admin. Critically, it discloses that the plainKey is returned once and never shown again, which is exactly the kind of operational detail an agent must know before invoking.

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 sentences, each carrying distinct information: what is created, its immediately observable state, the one-time key disclosure, and the authorization prerequisite. The most time-sensitive fact (plainKey shown once) is front-loaded before the tail requirement clause.

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?

There is no output schema, so the description carries the return-value burden, and it does disclose the key field (plainKey) plus its one-time nature. It does not describe the rest of the response (e.g., the created agent's id/username) or failure cases such as duplicate username/namespace, so a small gap remains for a mutation tool.

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%, so the schema already documents all four parameters (role enum semantics, username constraints, display_name default, namespace_slug format). The description only restates that the org is identified by namespace slug, adding no per-parameter meaning beyond the schema. 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?

The description states a specific verb and resource ('Create a non-human agent account') and immediately qualifies the account type ('User type=\'agent\''), which cleanly separates it from create_organization, add_namespace_member, and issue_agent_key in the sibling list. An agent can identify exactly what this tool produces without opening the 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?

Usage context is clear: it is for non-human agent accounts inside an existing org, requires owner/admin, and auto-issues the first API key (implicitly distinct from issue_agent_key for later keys). It lacks explicit 'when not to use' guidance or a direct name-check against issue_agent_key/add_namespace_member, which keeps it at 4 rather than 5.

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