set_default_backend

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

With no annotations provided, the description must fully disclose behavioral traits. It indicates mutation ('set') and a return value, but does not mention failure scenarios (e.g., if the backend doesn't exist), side effects, or error conditions. This is insufficient for a write operation.

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 short and to the point, with two clear paragraphs. It is front-loaded with the purpose. Minor improvement could be combining the Args and Returns into a single sentence, but it is still efficient.

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?

Given the tool has one required parameter and an output schema, the description is incomplete. It does not explain how to find available backends (e.g., use list_backends) or that the backend must be registered first. For a simple tool, more context is needed for correct invocation.

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 schema has 0% description coverage, so the description should add meaning beyond the property title. However, the Args section merely restates the schema: 'name: Name of the backend to set as default'. It adds no constraints or context (e.g., must be a registered backend).

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 tool's action: setting the default backend. It specifies the resource ('default backend for operations') and the condition ('when no backend is specified'), which distinguishes it from sibling tools like register_backend or check_backend_health.

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 implies usage when you want to set a default backend, but it does not provide explicit guidance on when not to use this tool or mention alternatives. It lacks context such as prerequisites (e.g., the backend must already be registered).

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