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

No annotations are provided, so the description carries the full burden. It discloses the operator semantics and the default shift amount, which is decent for a pure deterministic function, but says nothing about error handling for non-numeric or negative input and the free-trial line is promotional rather than behavioral.

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 functional sentence is front-loaded and efficient. The trailing emoji/pricing blurb adds no selection value but is brief and does not obscure the core statement.

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 single-parameter pure math function with no output schema, the operation description is close to sufficient. The gap is the phantom 'shift count' parameter: an agent cannot tell from the schema or description how to supply a non-default shift amount.

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 0% and the only declared property (value, typed as string) has no description. The description partially compensates by implying value must be an integer, but it also claims a 'shift count (default 1)' parameter that does not exist anywhere in the schema, which is actively misleading about how to invoke the tool.

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 operation (right shift) on a specific resource (integer value) and the returned result. It does not, however, distinguish itself from close siblings like x402-bit-shift-left or x402-bit-unsigned-shift-right, which matters because signed vs unsigned right-shift semantics differ.

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 when-to-use guidance, no stated preconditions, and no reference to the obvious alternatives (bit-shift-left, unsigned-shift-right, or the other bitwise siblings). The agent is left to infer selection purely from the name.

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