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gblinproject

@gblin-protocol/mcp-server

swap_gblin_to_usdc_jit

Converts GBLIN to USDC in a single atomic transaction to pay x402 invoices. Works with any wallet type for immediate settlement.

Instructions

Generate ready-to-broadcast calldata that converts GBLIN → USDC in a single atomic transaction via the contract's native sellGBLINForToken function. Works on any wallet (EOA, ERC-4337 smart account, EIP-7702). Use this immediately before paying an x402 invoice.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
usdc_neededYesUSDC amount, decimal string.
wallet_addressYesAgent's 0x address (for cooldown check).
Behavior3/5

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

No annotations provided, so description carries full burden. It discloses that the tool generates ready-to-broadcast calldata (not executing the swap) and works on various wallet types. However, it does not discuss potential side effects, gas costs, or prerequisites like GBLIN balance.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Three concise sentences, each adding unique value: purpose, compatibility, and usage timing. No redundant information.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given no output schema, description could mention expected return format (calldata hex). However, it covers the core function and usage context well. No missing critical details for a calldata generation tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% with clear parameter descriptions. The tool description adds minimal extra value beyond the schema (e.g., 'for cooldown check' on wallet_address). Baseline 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Description clearly states it generates calldata to convert GBLIN to USDC via a specific contract function. Differentiates from siblings like invest_usdc_to_gblin (opposite direction) and quote_safe_swap (quoting).

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly says 'Use this immediately before paying an x402 invoice' and notes wallet compatibility. Does not provide explicit when-not-to-use or alternatives, but context is clear enough.

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

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