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

Annotations already declare readOnly=false, openWorld=true, idempotent=false, destructive=false, so the safety profile is covered. The description adds that the tool is authenticated and that retries are immediate and scoped to fanout deliveries, which is useful context, but it says nothing about side effects, interaction with cancel_queued_retries, or whether queued retries can be undone.

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?

A single, front-loaded sentence with no filler. It is efficient, though its brevity is partially a symptom of under-specification rather than deliberate tightness.

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 non-idempotent mutation with three undocumented parameters and no output schema, the description leaves critical gaps: no parameter semantics, no guidance on retry scope or volume, and no indication of how to observe results. Annotations cover only the safety profile.

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 0% for three parameters (limit, windowHours, destinationId), and the description contributes no parameter meaning at all. An agent must guess what windowHours values mean, whether limit bounds the retries or the scan, and what destinationId scopes, so the description fails to compensate for the schema gap.

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 action (queueing immediate retries) and a specific resource (failed fanout deliveries), which an agent can distinguish from replay_event/replay_message and cancel_queued_retries. It stops short of explicitly differentiating itself from those siblings, but the verb+resource is concrete.

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?

There is no when-to-use guidance: nothing tells the agent when to prefer retry_failed_deliveries over replay_message, replay_event, or list_retry_jobs. 'Authenticated' implies a prerequisite but no exclusions or alternatives are given.

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