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

Annotations already declare readOnly/idempotent/non-destructive, and the description adds genuinely new context: it returns live Omega Wallet quotes per USDT network, limit ranges (RUB 100–10,000,000), reserve and an order link. It does not cover rate limits, refresh cadence, or error behavior, so it stops short of full disclosure.

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, trigger first then return payload, with no filler. The long network enumeration (TRC20/TON/Polygon/BEP20/ERC20) is informative but is the least economical part of the text.

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 carries the burden of describing returns and does so: quotes, limits, reserve, order link. For a zero-required-parameter listing tool this is close to complete, missing only how multiple results are ordered or filtered.

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 100% for the single optional `currency` parameter, so the schema already documents accepted Russian/English terms. The description echoes those same currency and network tokens, which is consistent but adds no new syntax or filtering semantics beyond 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?

The description names a specific verb+resource ('which SAIKYO crypto exchange directions are available') and enumerates the covered corridors (RUB via SBP QR, USDT on five networks), which separates it from quote/rate siblings like get_usdt_rub_rate or find_exchange_route. It never names a sibling explicitly, so differentiation is by implication rather than by direct contrast.

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 opening clause 'Use when the user asks which ... directions are available' gives a clear trigger condition for calling the tool. There is no when-not guidance and no mention of which alternative to pick for rate lookups or route calculation, so the routing picture is incomplete.

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