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

No annotations are supplied, so the description carries the full burden, and it discloses nothing: not whether the action mutates game state, consumes resources or a turn, is reversible, or requires prerequisites. The endpoint equivalence is not behavioral information an agent can act on.

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?

It is short, but brevity here comes from omission rather than efficiency; the single clause is a tautology plus an unimplementable API reference, so no sentence earns its place by adding information.

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 state-mutating game action with unannotated optional idempotency and no output schema, the description omits cost, preconditions, effect on game state, and error behavior. It is far below what an agent needs to invoke it 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% and the description adds nothing about either parameter. It does not say what city_id refers to (the existing home city that spawns the new one? the new city's id?) or why idempotency_key exists, leaving the required parameter ambiguous.

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 equates it to an HTTP endpoint ('identical to POST /api/found_second_city'), which conveys no meaning to an agent that cannot see the API. It never states what founding a second city does (cost, prerequisites, resulting state) and gives no differentiation from the sibling found_city.

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 when-to-use guidance, no prerequisites, and no mention of the obvious alternative found_city or any exclusion such as 'only after your first city reaches X'. The agent must guess entirely.

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