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

Annotations already declare destructiveHint=true, idempotentHint=false, and openWorldHint=true, so the agent knows this triggers an external, non-idempotent send. The description adds the useful 'after fixing the receiver' framing but never explains what the destructive flag means here (e.g., a new outbound delivery to a live endpoint) or whether the prior delivery record is replaced.

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 the key scope ('one webhook endpoint') stated immediately. The parenthetical earns its place as the only usage hint, and there is no filler.

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?

A destructive, non-idempotent mutation with no output schema needs a bit more: what the call returns, whether the event must still be within a retention window, and what happens if endpoint_id no longer exists. Annotations cover safety, so the gap is moderate rather than critical.

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 only 50% — endpoint_id has no documented description. The sentence does partially compensate by implying id is the event being resent and endpoint_id is the destination endpoint, but it adds no format, prefix, or lookup guidance beyond that inference.

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+resource: re-send an event to a single webhook endpoint. The 'one webhook endpoint' scope implicitly separates it from the bulk sibling replay_failed_webhooks, though that sibling is never named explicitly.

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 parenthetical '(after fixing the receiver)' gives a clear precondition — use this once the receiving endpoint is repaired. It does not name alternatives such as replay_failed_webhooks (bulk) or test_webhook (verification), so the agent must infer when to prefer this over them.

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