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

Annotations only declare the generic safety profile (readOnlyHint=false, destructiveHint=false, openWorldHint=false); the description adds real substance by disclosing the external side effect on PagerDuty and the escalation consequence, plus the confirm gate. It stops short of explaining the non-idempotent behavior flagged by idempotentHint=false (what happens on a repeat ack) or whether the incident must be assigned to the caller.

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?

One tight sentence with the action and its consequence front-loaded and the confirm gate as the final clause. No filler, no restatement of 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?

There is no output schema, so the description ideally would say what an ack returns, but for a simple state-changing action it covers purpose, side effects, and the safety gate adequately. Minor gaps are the project-scoping condition and the outcome on repeated acknowledgment.

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%, so all three parameters are already documented, including confirm's meaning. The description only reinforces that confirm=true is mandatory rather than adding syntax, format, or edge-case meaning beyond the schema; baseline 3 applies.

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?

Names a specific verb ('Acknowledge') and resource ('an incident's alert') plus the concrete effect of the action (stopping escalation, acknowledging PagerDuty). That effect cleanly separates it from neighbors like relia_get_incident (read) and relia_mark_fixed (post-resolution), so an agent can pick it without opening the 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?

The description establishes the operative context — acknowledging an active alert before the on-call rotation escalates — and states the hard prerequisite that nothing happens without confirm: true. It does not name an explicit alternative or a when-not-to-use case (e.g., use relia_mark_fixed once resolved), which keeps it below a 5.

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