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

readOnlyHint already declares safety, so the redundant 'Read-only' adds nothing. What does add value is the scope disclosure: it defines exactly which channels are returned (Slack channels the org's Ankra Slack app can post to; Teams channels of every team where the Ankra bot is installed), which is behavioral/precondition information the annotations cannot convey. It omits pagination and return-shape detail.

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?

Two tight, front-loaded sentences cover the purpose, the scope of the two channel sources, and the downstream consumer. The trailing 'Read-only' is pure redundancy with readOnlyHint and is the only wasted phrase.

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 single-parameter, no-output-schema listing tool, the description covers what is enumerated, the two integration scopes, and how the result is used, which is enough to call it correctly. It could state the return shape (list of channel ids/names) more explicitly, but the 'Use the ids with create_alert_destination' sentence conveys this implicitly.

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 100% and the enum values are already fully documented in the schema, so the description essentially restates the slack/teams meanings. With the schema doing the heavy lifting, this is the baseline 3 rather than added meaning.

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 ('List the channels a channel-based alert destination can deliver to') and immediately scopes it to the two integration families. This clearly distinguishes it from list_alert_destinations (which lists the destinations themselves) and get_alert_destination, so an agent can pick it without opening a schema.

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?

Gives a concrete workflow: fetch these channel ids and pass them to create_alert_destination. That ties the tool to a downstream sibling. It stops short of explicit when-not guidance (e.g. use list_alert_destinations when you want destinations rather than channels), so it is clear context rather than a full routing rule.

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