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

With no annotations, the description carries the full load and does well: it discloses the data provenance ('Alchemy's transfer index') and, critically, the payment requirement ('Costs $0.01 USDC on Base via x402'), which an agent must know before invoking. It omits rate limits and response shape, but for a read-only profiling tool the key operational facts are present.

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?

Front-loaded with the scoping question, then a tight enumeration of returned data, ending on the cost. It is a single dense sentence plus cost clause with no redundant filler, though the enumeration is long enough to be slightly dense.

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 must convey return contents and it does so thoroughly, listing every major field group. Combined with the cost disclosure and data-source note, an agent has enough to call it correctly; only pagination/response-shape detail is absent.

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?

There is a single parameter with 100% schema coverage, so the schema already documents the address and its format pattern. The description reinforces that it targets a Polygon PoS address but adds no format or validation nuance beyond the schema. Baseline 3 is appropriate.

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 opens with a specific framing question ('Who is this Polygon PoS address?') and enumerates exactly what the profile contains: wallet age, first funder, contract/EOA, balance and nonce, transfers, counterparties, USD large transfers. This concretely distinguishes it from siblings like polygon_wallet_balances and polygon_transaction_summary, though it never names them 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?

The 'Who is this address?' framing implies the investigative use case, but there is no explicit guidance on when to choose this over polygon_wallet_balances, polygon_transaction_summary, or polygon_large_trades. Usage is inferable but not directed.

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