Start the CarMaker for Simulink session

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

Beyond the annotations (destructiveHint=false), the description makes explicit that 'Nothing is restarted or closed', that only missing pieces are brought up (idempotency), and what the ready=true/false return signals plus the waiting condition mean. This adds meaningful behavioral context the annotations cannot convey.

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 dense but front-loads the primary action and each sentence carries information. It is a fairly packed paragraph with some long compound sentences, but there is little outright waste.

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 multi-step session-startup tool, the description covers side effects, idempotency, model-optional behavior, init-script handling, wait/timeout guidance, and return semantics, and an output schema exists to absorb return details. Nothing an agent needs to invoke it correctly is missing.

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 100%, so the baseline is 3, but the description adds real meaning: it ties 'init' to workflow ('if init_scripts_found lists one, pass it as init') and explains the no-model case that drives the 'model' parameter choice. It stops short of detailing max_wait_s 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?

States a specific verb and resource ('Bring up a CarMaker for Simulink session') and enumerates the concrete steps (start MATLAB, run cmenv, open Simulink model, open CarMaker GUI). This clearly separates it from siblings like cm_start_sim (run a simulation) and cm_standalone_launch (a different server type).

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?

Gives strong operational context: bring the session up 'as far as it is missing', call again until ready, and pass a script from init_scripts_found as init when a project needs its own setup. It does not explicitly name alternative tools or state when NOT to use it, so it falls short of a 5.

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