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

Annotations already establish that this is a non-destructive, closed-world read, so the description correctly spends its words elsewhere: it discloses the output encoding ('base-unit integer strings') and the 1-90 day window bound, both of which are non-obvious. Worth flagging that the stated 1-90 day bound conflicts with the schema, which allows any integer up to 9007199254740991 and negative values, so an agent may not know which limit governs.

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, no filler, and the substantive content (what is summed, for which chain, over what window) is front-loaded. The units note is a tight second sentence that earns its place.

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 and no parameter documentation, the description carries real burden, and it does explain the shape of what comes back (per-token in/out sums plus native flows, integer base units). It stops short of saying how tokens are keyed in the response or whether zero-activity tokens are included, which leaves a small gap for an agent that must post-process the result.

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%, so the description must carry both parameters, and it does: 'address' is typed as a Wanchain address and 'days' is given meaning as a 1-90 day window (with a default of 30 visible only in the schema). The only weakness is the mismatch between the stated 90-day ceiling and the schema's effectively unbounded maximum.

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?

Names a specific output (per-token in/out sums plus native WAN flows) scoped to a Wanchain address and a time window, which is concrete enough to picture the result. It does not explicitly contrast itself with near-neighbours like get_address_activity, get_address_ledger, or get_address_holdings, so the agent must infer the boundary from the word 'flows'.

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 statement of when to reach for this tool versus the ~39 siblings, several of which are plausible substitutes for address-level history. The 1-90 day window bound is a constraint on a parameter rather than usage routing, so nothing tells the agent when this is the wrong choice.

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