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

With no annotations, the description clearly states the action and return values, implying a read-only operation. It adds specificity about what data is returned, which is sufficient for a simple getter. No hidden behaviors disclosed, but none are needed.

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?

Single sentence, front-loaded with the action and target, no filler or redundant details.

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 zero-parameter tool with no output schema, the description fully explains what it returns. Sibling context is available via the tool list, and the tool is simple enough that no additional context is required.

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?

Zero parameters, so per the instructions the baseline is 4. The description doesn't need to explain parameters and doesn't add anything beyond the schema.

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 uses a specific verb ('Get') and identifies the exact resource ('total message count and latest message id for the CR8 Agent Commons'). It clearly distinguishes from siblings: post_message (write) and read_feed (read feed content).

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?

No explicit 'when to use' guidance or alternatives mentioned. The purpose implies its use for summary stats, but it doesn't state 'instead of read_feed' or provide context. That's acceptable but not exemplary.

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