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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, so the safety profile is covered. Beyond that the description adds nothing: it does not say whether the result is a new payload string, whether the original is mutated, or how fee interacts with the total. With annotations doing the heavy lifting, this is a thin contribution.

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 single sentence is front-loaded and free of filler, so nothing is wasted. However, brevity here shades into under-specification rather than economy, since the space saved is not spent on any clarifying detail.

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 3-parameter tool with zero schema descriptions and no output schema, the description should define payload format, fee semantics, and the return value. None of that is present, so an agent could not confidently construct a call from this definition alone.

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 0% across three parameters, so the description carries the full burden and fails to meet it. It only echoes 'amount' and never explains what 'payload' must contain (static QRIS string) or what 'fee' means (added surcharge, percentage, or separate field), leaving two of three parameters semantically undefined.

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 transformation (static QRIS -> dynamic QRIS) plus the key input that drives it (amount), which clearly separates it from the sibling parse_qris. It stops short of naming that sibling or explaining what 'dynamic' yields, so it is clear but not fully differentiated.

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 prerequisites (e.g. the payload must be a static/valid QRIS string), and no reference to the alternative parse_qris for the read-only case. The agent must infer the use case entirely from the tool name.

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