hcloud_update_placement_group

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

Annotations already declare destructiveHint=true and openWorldHint=true, so safety is covered. The description adds one genuinely useful behavioral detail beyond annotations: a concurrent-modification 'conflict' error. However it omits what 'update' affects (e.g. that labels are fully overwritten, a destructive behavior the agent should know about) and says nothing about return values or idempotency.

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?

Short, but the first two sentences are redundant restatements of the same fact ('Update a PlacementGroup' / 'Updates the Placement Group properties'). The one valuable sentence, the conflict note, is buried at the end rather than front-loaded.

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 destructive mutation with a nested request body, no output schema, and only half the parameters documented, the description is insufficient: it doesn't enumerate what can be changed, doesn't warn that labels replace rather than merge, and gives no prerequisite or failure-mode context beyond the conflict case.

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 only 50%, so the description needs to compensate and does not. It never names the updatable fields (name, labels) nor the required id, and offers no format or overwrite semantics beyond what the schema already documents.

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?

States a specific verb and resource ('Update a PlacementGroup'), unambiguous about the operation. It does not differentiate itself from siblings like hcloud_get_placement_group or hcloud_delete_placement_group, though the verb makes the distinction reasonably implicit.

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 guidance on when to use this versus alternatives, no prerequisites (permissions, whether the group must be empty), and no mention of related tools such as hcloud_server_add_to_placement_group_action. The agent is left to infer everything about applicability.

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