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

Annotations already declare the safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=false, openWorldHint=true). The description adds two genuinely useful facts beyond that: the operation requires authentication and it is asynchronous ('queueing' rather than immediate replay). It stops short of the duplicate-creation risk implied by idempotentHint=false or of any confirmation/permission 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?

A single front-loaded sentence with no filler, and the auth note comes before the action. It is appropriately sized, though its brevity reflects thin content rather than disciplined editing.

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 mutation tool with one undocumented required parameter and no output schema, the description omits key facts: where eventId comes from, what 'queueing' means for the eventual delivery, and whether repeated calls are safe. The annotations carry the safety profile, but the operational context is incomplete.

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% and the sole parameter eventId has only a minLength constraint, with no format, source, or example. The description contributes only the weak implication that the id refers to an already 'received' event; it does not tell the agent where to obtain the id or how it is shaped.

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 gives a specific verb+resource ('queueing a replay of a single received event'), and the word 'single' implicitly distinguishes it from the bulk sibling replay_events. However, it never names that sibling, so an agent must infer the scope contrast from the plural tool name rather than from explicit wording.

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 explicit when-to-use guidance, no prerequisites, and no mention of alternatives such as replay_events, replay_message, or retry_failed_deliveries. Only a faint signal ('single') hints at the bulk-vs-individual distinction, leaving the agent to guess which replay/retry tool fits.

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