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

No annotations are provided, so the description carries the full burden. It explicitly discloses that this is a 'Write operation' and that there is 'no credit cost,' which are important behavioral traits. It does not detail idempotence, return values, or error behavior, but for this simple state-changing operation the disclosure is reasonably complete.

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 consists of two short sentences with no filler. The operation is stated first, and the relevant behavioral notes (write, no credit cost) follow concisely.

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?

Given the low complexity (one required parameter, no output schema, no nested objects), the description provides enough information for an agent to invoke the tool correctly. It omits return-value details and prerequisites, but these are unlikely to be essential for a straightforward mark-as-read operation.

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?

The schema description coverage is 0%, so the description must compensate. It does so by identifying the object as a 'CRM notification,' making it clear that the required 'id' parameter refers to a notification ID. This adds meaning beyond the bare schema definition of 'id' as a string.

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 clearly states a specific verb ('Mark') and a specific resource ('a single CRM notification'), with the end state 'as read'. The qualifier 'single' distinguishes it from the sibling crm_mark_all_notifications_read, so an agent can tell them apart.

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 word 'single' implies this tool is for one notification at a time, contrasting with the sibling crm_mark_all_notifications_read, but it does not explicitly name alternatives or state when not to use this tool. The usage context is clear enough to infer, but the guidance is not explicit.

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