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

No annotations are supplied, so the description carries the transparency burden. It discharges this by specifying the exact computation and return value ('returns a | b'), which implies a pure, non-mutating operation. It does not cover width or signedness edge cases, but none are essential for a simple bitwise OR.

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?

Two short sentences with no filler; the operation, operands, and result are front-loaded. The only redundancy is the 'Bit Or' label, which is not a meaningful cost.

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 pure two-integer utility, the description is essentially complete: operands, operation, and return value are all present, and no output schema is required. The input schema is empty, so the agent must rely on the description's named a/b, but that is exactly what the description provides.

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 schema declares no properties, so the description is the only source of parameter meaning. It adds the names a and b, their type as integers, and their relationship to the output. It could specify packaging or constraints more explicitly, but it compensates for the empty 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, resource, and result: 'Perform a bitwise OR operation between two integers' and 'returns a | b.' This clearly distinguishes x402-bit-or from sibling bitwise tools such as x402-bit-and and x402-bit-xor.

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 operation is explicit: use it when a bitwise OR of two integers is needed, and the operands a/b are named. It does not list alternatives or exclusions, but for a pure function like this, the operation itself provides sufficient context.

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