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

Annotations already cover the safety profile: not read-only, not destructive, non-idempotent, closed-world. The description adds a meaningful behavioral constraint that some channel kinds require a paid plan, though it does not describe duplicate-name behavior or failure modes.

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 two compact sentences with no wasted text. The core action is front-loaded, followed by a dense but well-organized per-kind settings reference.

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 three-parameter creation tool with annotations and no output schema, the description supplies the critical missing config-key details and plan restriction. It does not cover duplicate handling or the return value, but those are secondary given the annotations and schema.

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?

The schema's config object is generic and does not describe individual keys, but the description enumerates the required settings for each kind: email {to}, webhook {url, secret}, slack {url}, discord {url}, telegram {token, chat_id}, ntfy {url, token}. This adds substantial meaning beyond the schema.

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: adding an alert channel. It is clearly distinguishable from update_channel, delete_channel, list_channels, test_channel and from non-channel create tools by the resource name.

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?

The description implies this is for creating new channels and notes the paid-plan prerequisite for Slack, Discord, Telegram and ntfy. However, it does not explicitly say when to use this versus update_channel or test_channel, nor does it describe exclusions or alternatives.

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