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. The description adds genuine value beyond that by enumerating what the quote returns (live rate, network fee, amounts, limits, reserve, order link), which is important since there is no output schema.

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 sentences with zero filler, front-loaded with the trigger ('Use for...') followed by the return payload. Every clause carries information the agent needs.

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?

With no output schema, the description helpfully enumerates the returned fields, and the fixed corridor is stated. The main residual gap is the absence of workflow positioning relative to start_exchange_order, which would matter for a multi-step exchange flow.

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 all four parameters (amount, from_code, to_code, amount_side) are already documented with defaults and enum values. The description adds no parameter-level detail beyond the schema, so the baseline 3 applies.

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 ('calculate ... quote') and resource (SAIKYO exchange) with the exact corridor (RUB via SBP QR/Omega Wallet to USDT). This distinguishes it from sibling rate tools like get_usdt_rub_rate and execution tools like start_exchange_order, though it never names those siblings explicitly.

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?

'Use for an exact SAIKYO quote' implies the pricing context, so an agent can infer this precedes start_exchange_order. However, there is no explicit when-not guidance or named alternative, and no mention of prerequisites the agent might need before or after quoting.

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