create_segment

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

The description discloses useful behavior: it is a write operation, same segment_id overwrites via PUT, it returns the created segment dict or an error/hint, and a gateway-less segment is isolated. However, it contradicts the annotation idempotentHint=false by describing a PUT-style overwrite with the same segment_id, which implies idempotent upsert behavior.

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 compact and front-loaded: it states the action first, then packs prerequisites, parameter selection, overwrite behavior, return shape, and follow-up workflow into a few sentences. Every sentence contributes an operational fact with no filler.

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 write operation with no output schema, the description covers the return contract (created segment dict, otherwise error/hint), the required precondition, the key parameter disambiguation, and the post-creation gateway workflow. It is appropriately complete for an agent to invoke the tool correctly.

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 100%, so the baseline is 3. The description adds cross-parameter meaning not in the schema: transport_zone_path decides whether subnet or vlan_ids applies, and the wrong one is rejected. It also reinforces that segment_id becomes the /infra/segments/<segment_id> path.

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 an overlay or VLAN-backed NSX network segment.' It also opens with [WRITE], making the operation's nature explicit. It clearly distinguishes this from sibling tools like list_segments, get_segment, update_segment, and delete_segment.

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 a concrete prerequisite ('Run list_transport_zones first for transport_zone_path'), explains the conditional parameter choice ('subnet or vlan_ids applies — the wrong one is rejected'), and outlines the follow-up workflow ('link it with create_tier1_gateway, then verify with get_segment'). It does not explicitly contrast with update_segment, but the guidance is otherwise clear and actionable.

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