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

No annotations are provided, so the description carries full disclosure burden, yet it says nothing about mutation effects, cost, authorization, or reversibility. Even the presence of an idempotency_key parameter goes unmentioned in behavioral terms.

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 single parenthetical sentence is short and front-loaded with the tool name, so there is no bloat. However, brevity here reflects missing content rather than efficiency.

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 an unannotated, undocumented, mutation-shaped action with two opaque parameters and no output schema, the description provides nothing an agent needs to invoke it correctly or safely.

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% for both parameters. The description does not explain what city_id refers to or why an idempotency_key exists, so nothing compensates for the undocumented schema.

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 only restates the tool name and notes it maps to POST /api/train_assign. It never says what 'train_assign' actually does (assigning a general to training? training assignment in a city?) nor how it differs from sibling tools like assign_line or create_general.

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?

There is no indication of when to use this action, prerequisites (does the city need a barracks?), or which sibling tool to use instead. The agent is left to infer everything from the name.

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