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

Annotations already declare readOnlyHint=false and destructiveHint=false; the description adds genuinely new context by disclosing that apps keep running during the upgrade (non-disruptive) and that no human approval gate exists. What is not covered: reversibility, whether the server restarts, and any timeout or rate constraints.

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?

Three short sentences, front-loaded with the core action and scope. The trailing 'This call asks no human' is slightly cryptic phrasing but still earns its place as a confirmation-free signal.

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?

It covers the behavioral essentials for a non-destructive mutation and needs no output-schema explanation since none exists. But with zero parameter documentation and no mention of failure handling (e.g., what happens if the server is draining or the channel has no newer release), an agent lacks enough to invoke it confidently in edge cases.

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 0% for three parameters, and the description adds nothing: it does not explain that 'server' is a hostname matching the given pattern, nor what 'request_key' (apparent idempotency key) or 'wait_seconds' (bounded wait for completion) do. Only the single required parameter's intent is derivable from the name.

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 ('Upgrade Ployz on a server to its channel's latest release'), which an agent can distinguish from server_show or server_upgrade_policy_set. It stops short of naming the policy sibling that controls which release the channel resolves to, so differentiation is inferred rather than stated.

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?

'This call asks no human' and 'Apps keep running' imply this is a safe, unattended operation, which gives some context for when to invoke it. However, it never says when to prefer it over server_upgrade_policy_set, server_drain, or deployment_start, and no preconditions (server must be healthy, not draining) are given.

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