close_position

Market-close the open position on symbol. Returns None if no position.

SERVERLighter MCP SOURCE0xdegenmo/lighter-mcp

Critical RISK CLASS

Category Financial

Parameters 00 required

Recommended Approval-gatedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/0xdegenmo-lighter-mcp/close-position.md

WHAT IT DOES

What close_position does on Lighter MCP

AI agents use close_position to commit financial operations through Lighter MCP, usually the final step of a payment, billing, or trading workflow. A call moves real money.

RISK

Why close_position is rated Critical

This tool closes a trading position on a perpetual DEX, which is a financial operation that executes a market order to exit a position. This directly affects financial holdings and is irreversible once executed on-chain. Misuse could result in significant financial loss by closing positions at unfavorable market prices or closing positions unintentionally.

From the tool's definition Market-close the open position on `symbol`

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs close_position safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Lighter MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For close_position, this is the rule to start with:

close_position Approval-gated

Any call to close_position is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "close_position": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

GATE THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Lighter MCP, apply this rule, and every close_position call is checked against it from then on.

FAQ

Questions about close_position

What does the close_position tool do? +

Market-close the open position on symbol. Returns None if no position. It is categorised as a Financial tool in the Lighter MCP MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on close_position? +

Register the Lighter MCP server in PolicyLayer and add a rule for close_position: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Lighter MCP. Nothing to install.

What risk level is close_position? +

close_position is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit close_position? +

Yes. Add a rate_limit block to the close_position rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block close_position completely? +

Set action: deny in the PolicyLayer policy for close_position. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides close_position? +

close_position is provided by the Lighter MCP server (0xdegenmo/lighter-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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