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initiate_purchase

[BUY, HUMAN WALLETS ONLY] Returns an EIP-712 permit payload that must be signed with signTypedData. AI AGENTS: do NOT use this tool. Use initiate_agent_purchase instead. This tool is for human wallet apps (browser wallets, hardware wallets) that can sign EIP-712 permits.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
tokenIdYesToken ID of the listing to purchase
buyerWalletYesBuyer 0x wallet address on Base
selected_sizeNoFor sized products, the size you want to buy (e.g. "10.5", "M"). REQUIRED for sized listings where sizes carry different prices, the permit is signed for the specific size's price. Call get_drop first to see available variants and their prices.
selected_colorNoFor products with a colour axis (e.g. "Modern Chrome", "Brushed Steel"), the colourway you want to buy. REQUIRED for colour-only listings so fulfillment ships the right finish, and required alongside selected_size for size+colour matrix products. Read variants[] from get_drop_details to see available colours.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedInput schema / properties / selected_size / description
      Previous value: -"For sized products, the size you want to buy (e.g. \"10.5\", \"M\"). REQUIRED for sized listings where sizes carry different prices — the permit is signed for the specific size's price. Call get_drop first to see available variants and their prices."New value: +"For sized products, the size you want to buy (e.g. \"10.5\", \"M\"). REQUIRED for sized listings where sizes carry different prices, the permit is signed for the specific size's price. Call get_drop first to see available variants and their prices."
  2. Changed1 schema field changed
    • addedInput schema / properties / selected_color
      Added value: +{
+  "description": "For products with a colour axis (e.g. \"Modern Chrome\", \"Brushed Steel\"), the colourway you want to buy. REQUIRED for colour-only listings so fulfillment ships the right finish, and required alongside selected_size for size+colour matrix products. Read variants[] from get_drop_details to see available colours.",
+  "type": "string"
+}
  3. Changed1 schema field changed
    • addedInput schema / properties / selected_size
      Added value: +{
+  "description": "For sized products, the size you want to buy (e.g. \"10.5\", \"M\"). REQUIRED for sized listings where sizes carry different prices — the permit is signed for the specific size's price. Call get_drop first to see available variants and their prices.",
+  "type": "string"
+}
  4. Changed1 schema field changed
    • changedInput schema / properties / tokenId / description
      Previous value: -"Token ID of the drop to purchase"New value: +"Token ID of the listing to purchase"
  5. First observed

TDQS

A4.5/5.0
Behavior4/5

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

With no annotations, the description carries the burden of disclosure. It reveals that the tool returns a permit payload requiring signTypedData, and that it is a buy operation intended only for human wallets. However, it doesn't describe post-signing steps (e.g., confirm_purchase) or any side effects, leaving slight ambiguity about the full workflow.

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?

The description is three sentences long, each earning its place. It front-loads the purpose and critical restriction, then explains the intended audience. No filler or redundancy.

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

Completeness5/5

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

Given the tool's complexity (EIP-712 permit, human wallet restriction) and the absence of an output schema, the description adequately explains what the tool returns, who should use it, and the alternative tool. It provides enough context for correct invocation without needing to list return structures.

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 description coverage is 100%, so the schema fully documents tokenId, buyerWallet, selected_size, and selected_color. The description adds no additional parameter details beyond what is already in the schema, making the description redundant for parameter semantics. 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?

The description clearly states the tool's function: 'Returns an EIP-712 permit payload that must be signed with signTypedData.' It specifies the resource (purchase permit) and action (initiate) with a specific output. It also distinguishes itself from the sibling tool initiate_agent_purchase by explicitly identifying this as the human-wallet variant.

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

Usage Guidelines5/5

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

The description provides explicit usage guidance: 'AI AGENTS: do NOT use this tool. Use initiate_agent_purchase instead.' and 'This tool is for human wallet apps (browser wallets, hardware wallets) that can sign EIP-712 permits.' It clearly states when to use and when not to, naming the alternative tool.

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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