prepare_marginfi_init

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

The description fully discloses behavior: uses marginfi_account_initialize_pda, PDA seeds, cost details (rent-exempt minimum + tx fee), rent refundability, durable nonce requirement, Ledger blind-sign, and error condition. Annotations (readOnlyHint=false, destructiveHint=true, idempotentHint=true) are consistent with the description; no contradiction.

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 description is packed with useful information but is somewhat lengthy. However, it is well-structured: purpose first, then details, cost, prerequisites, and error conditions. Every sentence adds value, so it earns a 4.

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?

Given the complexity of the tool (Solana PDA initialization with Ledger and nonce), the description covers purpose, mechanics, cost, prerequisites, device compatibility, and error conditions. No output schema exists, but the description sufficiently informs the agent of all needed context.

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 100%. The description adds meaning beyond the schema by explaining the deterministic PDA seeds, default accountIndex, and that wallet is both authority and fee_payer. This provides useful context beyond the basic parameter descriptions.

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 clearly states the tool builds a transaction to create a deterministic MarginfiAccount PDA on MarginFi mainnet. It uses specific verbs ('build a tx that creates') and identifies the resource, and distinguishes from sibling tools by noting it is a one-time setup.

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 description explicitly says this is a one-time setup required before supply/borrow/repay/withdraw, that it requires a durable nonce, and that it refuses if the account already exists. It also addresses Ledger compatibility and blind-sign requirements, providing clear when-to-use and prerequisite guidance.

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