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

Annotations already declare readOnly=true, destructive=false, openWorld=true, so the safety profile is covered. The description adds genuinely useful context by pinning the simulation's physical model (supply voltage, stall torque, slew rate, arm length), which an agent needs to interpret results — but the truncated sentence omits the response format, whether it returns a time series or a final angle, and why idempotentHint is false for a deterministic physics sim.

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?

It is front-loaded with the verb and short, but the text is cut off mid-thought, so brevity here reflects incompleteness rather than efficiency. The physical constants occupy space that would have been better spent on the parameters or the return shape.

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?

A 7-parameter tool with zero schema descriptions, no output schema, and no required fields demands far more from the description than a single truncated sentence. The agent cannot know what the tool returns, what units the angles or gains use, or what happens with all-optional parameters omitted.

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?

All 7 parameters (kd, ki, kp, load_g, seconds, start_deg, target_deg) have 0% schema description coverage, so the description carries the full burden — and it names none of them. The mention of a load, an arm, and a servo response only vaguely gestures at load_g, seconds, and the angle parameters; the PID gains kd/ki/kp are never hinted at, and no units, ranges, or defaults are given.

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 concrete verb and resource — "Run a hobby servo simulation" — and names the physical plant (5 V servo, 0.18 N·m stall, 0.1 s/60°, 5 cm arm). No sibling tool overlaps with simulation, so no differentiation is required, but the sentence trails off with an ellipsis, so the agent never learns what the simulation actually produces.

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?

There is no statement of when to use this tool, no prerequisites, and no alternatives among the ~200 siblings. The agent must infer the use case entirely from the word "simulation".

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