stbl_write_contract · Stability MCP Server MCP

WHAT IT DOES

What stbl_write_contract does on Stability MCP Server

AI agents invoke stbl_write_contract to trigger actions in Stability MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why stbl_write_contract needs a policy

This tool executes state-changing operations on a blockchain smart contract. While it's not purely destructive (changes may be reversible depending on contract logic), it runs arbitrary contract code that can modify blockchain state, transfer tokens, or trigger complex on-chain operations.

From the tool's definition "Execute a state-changing contract call"

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

stbl_write_contract Rate-limited

stbl_write_contract 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.

View as policy code

policy.json

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

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Stability MCP Server, so you can run agents against it safely.

FAQ

Questions about stbl_write_contract

What does the stbl_write_contract tool do? +

Execute a state-changing contract call. It is categorised as a Execute tool in the Stability MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on stbl_write_contract? +

Register the Stability MCP Server MCP server in PolicyLayer and add a rule for stbl_write_contract: 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 Stability MCP Server. Nothing to install.

What risk level is stbl_write_contract? +

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

Can I rate-limit stbl_write_contract? +

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

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

stbl_write_contract is provided by the Stability MCP Server MCP server (nuljui/stbl-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.