swaptitan

hl_build_order

Build a ready Hyperliquid perpetual order action with SwapTitan builder code injected (minimal 0.001% fee). Non-custodial: returns the action + nonce to sign with your own wallet (EIP-712) and POST to https://api.hyperliquid.xyz/exchange. Call hl_approve first (once).

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "coin": "<coin>",
      "isBuy": "<isBuy>",
      "sz": "<sz>",
      "limitPx": "<limitPx>"
    },
    "name": "hl_build_order"
  }
}

Input Schema

Name	Required	Description
`sz`	Yes	Order size in coin units
`tif`	No	Time-in-force, default Gtc
`coin`	Yes	Market, e.g. BTC, ETH, SOL
`isBuy`	Yes	true=long/buy, false=short/sell
`limitPx`	Yes	Limit price
`reduceOnly`	No	Optional

Schema Changelog

Changes observed during successful MCP inspections.

First observedJul 6, 2026

TDQS

A4.2/5.0

Behavior4/5

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

The description discloses that the tool is non-custodial and returns an action + nonce to sign with the user's own wallet, adding context beyond the annotations (which indicate no destructive or read-only behavior). It provides essential behavioral traits without contradiction.

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 highly concise with two sentences, front-loading the core purpose and critical steps. Every sentence adds value without redundancy.

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?

Although there is no output schema, the description explains the return value (action + nonce) and the next step (POST to exchange). For a build-oriented tool, this provides sufficient context for an agent to use it correctly.

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%, so the description doesn't need to add parameter details. It adds no additional meaning beyond what the schema already provides, meeting the baseline expectation.

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 it builds a ready Hyperliquid perpetual order action with specific builder code and minimal fee. It distinguishes itself from sibling tools like hl_approve, which is a prerequisite, making the purpose unambiguous.

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?

The description explicitly mentions to call hl_approve first, providing clear prerequisite usage. It doesn't explicitly state when not to use or list alternatives, but the context is sufficient for correct usage.

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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