addPopulation

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

No annotations are provided, so the description must carry the transparency burden. It discloses a key prerequisite ('existing world' and 'after world creation') and notes that monsters are included. However, it doesn't explain behavior on invalid worldId, duplicate population names, whether populations are appended, or any side effects. Some context is provided, but significant gaps remain.

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, with the action and object front-loaded. Every part earns its place: it names what the tool does, gives examples, and provides a usage condition. No wasted words.

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?

With 9 parameters, 6 required, and no output schema, the description could provide more context about what happens on success/failure, error conditions, or return values. It adequately explains purpose and usage but lacks necessary behavioral details for a creation tool with no annotations to fall back on.

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?

The input schema provides descriptions for all 9 parameters (100% coverage), so the schema already defines the meaning of each field. The tool description adds no extra parameter-level detail beyond confirming monster support, which is already present in the schema. Baseline 3 is appropriate given high schema coverage.

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 clearly states the action ('Add a new population') and the target resource ('to an existing world'), with concrete examples (orcs, elves) and explicit scope ('including monsters'). This distinguishes it from sibling tools that focus on heroes, worlds, quests, and simulations.

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 includes usage context: 'after world creation' and examples like 'add orcs, elves, etc.' This implies it is for populating existing worlds, not for initial world setup. While it doesn't name alternatives, no sibling tools handle populations, so the guidance is sufficient.

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