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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description still earns credit for details annotations cannot encode: it is free, requires no registration, signs nothing, and does not persist the address (a privacy commitment), and it discloses that results are benchmarked against other Pitbi accounts. Only the purpose of the optional api_key is left unexplained.

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?

The single dense sentence is front-loaded with the essential framing (free, read-only, account) and then lists metrics. Every clause adds information, though the multi-line run-on formatting and the 'plus how it compares' tail make it slightly harder to scan than a short opening sentence followed by a crisp list.

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 an output schema present and rich annotations, the description needn't explain return values, and it correctly uses its space to sell scope and privacy. The remaining gap is the undocumented optional api_key and the absence of any guidance on which sibling tool to use when an agent needs a related capability.

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 parameter meaning. It does add value for 'address' by clarifying it accepts either a wallet or a Trading Account address. However, the second parameter (api_key, optional) is never mentioned, and it is conceptually odd for a tool that advertises 'nothing signed' — an agent cannot tell what supplying a key changes.

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 concrete verb+resource pair ('Free, read-only check-up of a Decibel account') and then enumerates the exact outputs: margin buffer, liquidation distance, positions without a stop-loss, fees, maker/taker share, win rate, realized result, funding, plus a cross-account comparison. An agent knows precisely what it gets back. It stops short of explicitly contrasting with the plausible sibling prove_account, so it is clear but not fully differentiated.

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?

Usage is implied rather than stated: 'No registration needed, nothing signed' signals this is the low-friction entry point, which suggests when to reach for it. There is no explicit 'use this instead of X' routing and no stated exclusion, so an agent must infer its relationship to prove_account and link_portfolio from names alone.

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