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

Annotations already disclose destructiveHint=true, readOnlyHint=false, and idempotentHint=false. The description adds valuable action-level behavior by explaining that dismiss removes the item from the queue and mark_responded records a reply. It still omits reversibility, permissions, and whether repeated calls are rejected.

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?

The description is short and front-loads the core purpose before action semantics. The Args block partly repeats parameter information already visible in the schema, but it earns its place by clarifying the two action values.

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-readonly, destructive mutation tool with no output schema, the definition provides enough information to call it correctly: required IDs, action values, and the effect of each action. It could be more complete by describing success/failure behavior or whether dismissed opportunities can be restored.

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 only 25%, so the description must compensate. It explains the three required parameters and, most usefully, the meaning of the action enum values beyond the bare enum list. However, it says almost nothing about how brand_id or opportunity_id are obtained or formatted, and it omits the optional user_intent argument entirely.

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 and resource: 'Update the status of a Reddit opportunity.' It also names the two status transitions, making the tool's scope clear. It does not explicitly distinguish this tool from nearby siblings like commit_opportunity, so it falls short of full sibling differentiation.

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?

It clearly explains when to choose each action: 'dismiss' removes an opportunity from the queue, while 'mark_responded' records that a reply was sent. However, it gives no guidance on when to use this tool versus get_opportunities or commit_opportunity, and no exclusions or prerequisites.

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