hydra_send_spl

THE RISK

Critical Risk

Why hydra_send_spl needs a policy

This tool transfers SPL tokens (fungible digital assets) on the Solana blockchain. Moving cryptocurrency or token assets constitutes a financial transaction. Misuse by an AI agent could result in irreversible loss of funds across wallets, warranting a critical severity rating given the financial blast radius.

From the tool's definition Send a Solana SPL token from a Chain-Signature-derived Solana address

Documented attack patterns abuse exactly the kind of access hydra_send_spl gives an agent:

POLICY

How to control hydra_send_spl

PolicyLayer is an MCP gateway — it sits between your AI agents and Near Hydra, and nothing reaches the server without passing your rules. This is the rule we recommend for hydra_send_spl:

policy.json

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

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

Create a free account and register Near Hydra — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

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Go deeper

Critical-risk tools in Near Hydra → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about hydra_send_spl

What does the hydra_send_spl tool do? +

Send a Solana SPL token from a Chain-Signature-derived Solana address. Auto-derives source + destination ATAs and creates the destination ATA on-the-fly if it doesn. It is categorised as a Financial tool in the Near Hydra MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on hydra_send_spl? +

Register the Near Hydra MCP server in PolicyLayer and add a rule for hydra_send_spl: 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 Near Hydra. Nothing to install.

What risk level is hydra_send_spl? +

hydra_send_spl 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 hydra_send_spl? +

Yes. Add a rate_limit block to the hydra_send_spl 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 hydra_send_spl completely? +

Set action: deny in the PolicyLayer policy for hydra_send_spl. 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 hydra_send_spl? +

hydra_send_spl is provided by the Near Hydra MCP server (nikshepsvn/near-hydra). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Near Hydra tool call.

Start from Near Hydra, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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