stellar_claim_claimable_balance

THE RISK

Critical Risk

Why stellar_claim_claimable_balance needs a policy

Claiming a claimable balance is a financial operation that irreversibly transfers assets from a claimable balance entry to the claimant's account. This constitutes movement of funds/assets on the Stellar blockchain, placing it in the Financial category. The severity is high because misuse could result in unauthorized claiming of funds or loss of assets, and the operation is not easily reversible on a blockchain.

From the tool's definition 'Claim a claimable balance' — claiming a claimable balance transfers ownership of funds held in a claimable balance entry to the claimant's account, moving assets on the Stellar network.

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

POLICY

How to control stellar_claim_claimable_balance

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

policy.json

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

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

Create a free account and register Stellar MCP — 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

More Stellar MCP tools

Financial stellar_create_claimable_balance Create a new claimable balance Financial stellar_fund_account Fund a test account using the Friendbot Financial stellar_payment Send a payment to another account Execute soroban_build_and_optimize Build and optimize a Soroban contract Execute soroban_deploy Deploy a Soroban contract Write stellar_change_trust Change trustline for an asset Write stellar_create_account Create a new Stellar Account Write stellar_create_asset Create a new asset on the Stellar network

All 12 Stellar MCP tools →

Financial tools on other servers

0xarchive web3_subscribe Math MCP Server financial_calculator MCP Kling generate_video MCP Uber Server uber_request_ride

Go deeper

Critical-risk tools in Stellar MCP → 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 stellar_claim_claimable_balance

What does the stellar_claim_claimable_balance tool do? +

Claim a claimable balance. It is categorised as a Financial tool in the Stellar MCP MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on stellar_claim_claimable_balance? +

Register the Stellar MCP server in PolicyLayer and add a rule for stellar_claim_claimable_balance: 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 Stellar MCP. Nothing to install.

What risk level is stellar_claim_claimable_balance? +

stellar_claim_claimable_balance 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 stellar_claim_claimable_balance? +

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

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

stellar_claim_claimable_balance is provided by the Stellar MCP server (syronlabs/stellar-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Stellar MCP tool call.

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

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