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

Beyond the annotations (destructiveHint=true, idempotentHint=true), it adds genuinely useful context: it is a partial update ('only the channels you send change'), requires admin rights, and depends on a paid plan plus a Slack connection. It does not explain behavior when a parameter is omitted, but the added auth/dependency details are substantial.

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?

Four short, front-loaded sentences with no filler; the core effect comes first and prerequisites and constraints follow. Every sentence earns its place.

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 simple two-boolean mutation with annotations covering the safety profile and an output schema covering returns, the description supplies the missing operational context (admin-only, Slack dependency, scope of change). Nothing essential to correct invocation is absent.

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 0% and the two booleans are otherwise undocumented, so the description carries the load. It maps 'email' and 'Slack' to the two parameters and clarifies the boolean semantics ('on or off'), compensating well for the coverage gap, though omission/default behavior is unstated.

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 gives a specific verb+resource: it turns delivery of a finished cycle on/off for email and Slack. It is clearly the mutation counterpart to the sibling get_delivery_settings, though it never names that sibling explicitly.

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 states clear prerequisites (admin only; Slack requires a paid plan and an in-app Slack connection) and a scoping rule ('only the channels you send change'). It stops short of explicitly naming when to use this versus get_delivery_settings or any alternative.

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