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

Beyond the annotations, the description discloses several traits an agent needs: the environment is started by default so DNS and the scheduler are running, the load balancer is created only later by deploy_application, and legacy_networking is PERMANENT and irreversible. It also flags the call as a mutation requiring user confirmation, which goes well past what readOnlyHint/destructiveHint already state.

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 definition is front-loaded with the core action and default behavior, then layers in network semantics and the legacy_networking warning. It is longer than typical but each paragraph carries distinct information; only the environment-definition paragraph is slightly incidental.

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 9-parameter mutation tool with no output schema, the description covers everything an agent needs: what gets created, defaults, irreversibility of legacy_networking, prerequisite lookup via list_servers, and the need for user confirmation. Annotations cover the safety profile and the schema covers all parameters, so no meaningful gap remains.

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 coverage is 100%, so the baseline is 3, but the description meaningfully enriches key parameters: legacy_networking's permanence and IPv6 preference (with a concrete example, mongod --ipv6), the default-start behavior, and the cluster parameter's link to list_servers. This adds real semantics beyond the schema text.

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 states a specific verb and resource ('Create a new environment on a Cycle cluster') and immediately defines what an environment is (a group of containers with a private IPv6 network). It is clearly distinguishable from siblings like delete_environment, list_environments, and cycle_control_environment, and it even clarifies scope relative to deploy_application's role with the load balancer.

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?

It gives strong context: find cluster identifiers with list_servers, and confirm name/cluster/legacy_networking with the user before calling. It also routes the load-balancer concern to deploy_application. It stops short of explicitly stating when NOT to use it (e.g. versus cycle_control_environment), so it is clear context rather than full when/when-not guidance.

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