soroban_build_and_optimize

THE RISK

High Risk

Why soroban_build_and_optimize needs a policy

This tool executes a build process that compiles and optimizes smart contract code. While building itself doesn't directly modify blockchain state (unlike the sibling payment/asset tools), it does trigger execution of external build tools and compilation logic whose effects depend on the contract code provided as arguments. This is fundamentally an Execute operation rather than a simple Read operation.

From the tool's definition Tool name explicitly states 'build_and_optimize' and description says 'Build and optimize a Soroban contract'.

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

POLICY

How to control soroban_build_and_optimize

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 soroban_build_and_optimize:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "soroban_build_and_optimize": {
      "limits": [
        {
          "counter": "soroban_build_and_optimize_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

soroban_build_and_optimize stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

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.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 12 Stellar MCP tools →

Execute tools on other servers

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Go deeper

High-risk tools in Stellar MCP → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-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.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about soroban_build_and_optimize

What does the soroban_build_and_optimize tool do? +

Build and optimize a Soroban contract. It is categorised as a Execute tool in the Stellar MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on soroban_build_and_optimize? +

Register the Stellar MCP server in PolicyLayer and add a rule for soroban_build_and_optimize: 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 soroban_build_and_optimize? +

soroban_build_and_optimize is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit soroban_build_and_optimize? +

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

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

soroban_build_and_optimize 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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