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

No annotations are provided, so the description carries the full behavioral burden, and it discloses nothing: no units (kg, m), no indication of which gravitational constant is assumed, no mention of output form. It only weakly implies a pure, side-effect-free numeric computation.

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 short but not concise in the useful sense: it is a redundant restatement of the title that wastes its only sentence instead of front-loading the formula or units. Brevity here reflects under-specification rather than efficiency.

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 physics calculator with three numeric inputs, no annotations, and no output schema, the critical missing information is units and the constant used; none is present. An agent could invoke this with the wrong unit convention and silently get a wrong result.

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 description coverage is 100%, so the baseline is 3, but the schema text itself is boilerplate ("Mass1 to process"), and the description adds no unit or interpretation guidance for mass1, mass2, and distance. The description neither compensates for nor worsens 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?

"Gravitational Force: Force of gravitational" restates the tool name rather than stating a verb and resource. It does not distinguish itself from close siblings such as x402-force, x402-centripetal-force, x402-earth-gravity, or x402-gravitational-constant, nor does it hint at the formula (Newtonian F = G·m1·m2/r²).

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 description offers no when-to-use guidance, no comparison to the many other force/physics siblings, and no preconditions. An agent has nothing to route on beyond the tool name.

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