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

Annotations already declare readOnlyHint=true, idempotentHint=true, openWorldHint=true and destructiveHint=false, so the safety profile is fully covered and the description does not contradict it. The description adds the unit context (coin units and USD) but says nothing about data freshness, rate limits, or the no-filter default return set.

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 tight sentences with the scope and coverage front-loaded; nothing is padded. The closing filter sentence overlaps with what the schema already exposes, which keeps it from a full 5.

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 low-complexity lookup with three optional enum params and no output schema, the description conveys the resource, the supported exchanges/coins/networks, and the returned units of measure. It omits what happens when no filters are supplied and whether fees are current, but the remaining gap is minor.

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 only 33% (only network is described), but the two enum parameters are self-documenting and the description's enumeration of coins and exchanges simply restates those enum values rather than adding syntax, defaults, or format meaning. It does confirm the three filters align with the schema, so a baseline 3 fits.

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 (withdrawal fees charged by exchanges) and enumerates the exact coverage: six named exchanges, three coins, per-network. That is far more specific than the sibling get_network_fees or get_bitcoin_fees. It stops short of explicitly naming a sibling to disambiguate against, so 5 is not warranted.

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?

"Filter by exchange, coin and network" tells the agent how to narrow results, which implies usage, but never states when this tool is preferable to get_network_fees or get_bitcoin_fees, nor any exclusion or prerequisite. Usage is only implied.

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