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

With no annotations provided, the description discloses critical behavioral details: recovery_token is shown only once and must be saved, and session_token is short-lived. These are not visible from the schema and add transparency. It does not mention other side effects, but for a creation tool with no params, this is strong coverage.

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 two sentences long, immediately states the purpose and return values, and provides necessary token-handling warnings without any filler. Every sentence earns its place.

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 zero-parameter creation tool with no output schema, the description fully covers the return values and their usage context. It explains the one-time token and session usage, making the description complete for its simplicity.

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?

There are zero parameters, and the schema is empty, so the baseline is 4. The description adds value by explaining what the tool returns, even though that is not parameter semantics. There is nothing else needed for params.

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 uses a specific verb ('Create') and a clear resource ('Apuchat account'), and lists the exact return values. This distinguishes it from sibling tools like create_channel and create_identity, making the tool's purpose explicit.

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 provides clear context by explaining that session_token is used as Bearer auth for /api/account/* endpoints and for the create_identity tool, implicitly signaling when this tool is needed. However, it does not explicitly state alternatives or when not to use it, so it stops short of full exclusions.

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