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

With no annotations, the description carries the full burden and does disclose the most important behavioral trait: this is a paid call costing $0.02 USDC via the x402 exact payment scheme. It also discloses the pricing oracle. It does not cover failure modes (invalid address, payment failure) or rate limits, but the payment disclosure is the critical missing piece in most definitions and it is present here.

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 dense sentences: the paid/cost constraint is front-loaded, then the returned data and its pricing source. No filler.

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 one-parameter tool with no output schema, the agent knows the cost, the payment mechanism, and the composition of the result. Remaining gaps (exact response shape, error behavior for malformed addresses) are 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 0% for the single 'owner' parameter, so the description must compensate. Mentions of SOL, SPL Token and Token-2022 imply a Solana address, which is the key semantic, but the description never explicitly defines 'owner' or its expected format.

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 resource (wallet portfolio) and precisely what is returned: SOL plus SPL Token and Token-2022 balances, priced with Jupiter Price V3. Sibling tools (build_swap_tx, get_quote, token_risk) are clearly different operations, so no confusion arises, though it never names or contrasts them directly.

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 call this versus alternatives, no prerequisites (e.g. wallet chain requirement), and no exclusions. The purpose implies usage, but the agent must infer everything about context.

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