Read GUI pop-ups

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

Annotations declare readOnlyHint=false, and the description justifies that non-obvious flag by disclosing that reading EMPTIES the GUI's buffer, which retains only five entries. That consumption/ring-buffer behavior is exactly the kind of side effect annotations cannot express, and it explains why a 'read' is flagged as non-read-only.

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?

Three sentences, front-loaded with the tool's output, then the destructive-read caveat, then the sibling routing. Despite the parenthetical field list, no clause is redundant and nothing essential is buried.

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?

An output schema exists, yet the description still summarises the payload (type/text/answer index/timeout) and the buffer semantics, so an agent has everything needed to call it and interpret results. Nothing relevant is missing for a zero-parameter read tool.

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 tool takes zero parameters, so the baseline is 4; there is no argument surface the description could clarify, and it correctly spends no words on inputs.

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 ('Pop-up messages the CarMaker GUI raised for this server's commands') and enumerates the returned fields (type, text, answer index, timeout), which cleanly separates it from cm_popup_timeout and from the cm_*_results/cm_*_logs readers. An agent knows exactly what this tool returns without opening the schema.

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 closing sentence routes agents away from this tool when other calls already surface popups, naming cm_load_testrun, cm_start_sim and cm_wait_end as alternatives. It stops short of an explicit 'call this when you suspect missed or queued popups', but the context for usage is clear.

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