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

readOnlyHint=true already declares the safe-read profile, so the description isn't required to explain side effects. It adds a small amount of context by naming the underlying public REST endpoint (GET /v1/alert-channels), but says nothing about pagination behavior, default/max page size, or what the returned channel objects contain.

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 short sentences with no filler; the resource list and examples come first and the API endpoint detail last. Nothing is padded or repeated from the title.

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 zero-required-param read-only list tool with full schema coverage and annotations covering safety, the description is sufficient. The only residual gap is pagination/return-shape expectation, which matters mildly for a list endpoint with no output 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?

Schema description coverage is 100% — both 'page' and 'limit' are documented inline — so the schema carries the parameter burden and a 3 is the baseline. The description adds no additional semantics (no default page size, no max limit guidance, no pagination notes).

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 ('List all') and resource ('alert channels') and adds concrete examples of channel types (email, Slack, webhook, PagerDuty). The scoping phrase 'configured in the account' cleanly separates it from account-vs-check scoped siblings like checkly_list_check_alerts and checkly_get_check_alerts.

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?

Usage is implied by the resource name — an agent knows to call this when it needs the account's alert channel inventory. However, there is no explicit when-to-use guidance, no mention of filtering or when to prefer a get-by-id call, and no exclusions relative to the many other list_* siblings.

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