// MCP TOOL REFERENCE

anvil_zksync

Start or check a local anvil-zksync development node. Supports forking from mainnet/testnet. Default port: 8011.

Part of the Foundry Zksync MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.

// WHEN AI AGENTS USE THIS TOOL

AI agents invoke anvil_zksync to trigger processes or run actions in Foundry Zksync. Execute operations can have side effects beyond the immediate call -- triggering builds, sending notifications, or starting workflows. Rate limits and argument validation are essential to prevent runaway execution.

// WHY ENFORCE A POLICY ON ANVIL_ZKSYNC

anvil_zksync can trigger processes with real-world consequences. An uncontrolled agent might start dozens of builds, send mass notifications, or kick off expensive compute jobs. Intercept enforces rate limits and validates arguments to keep execution within safe bounds.

// RECOMMENDED POLICY

Execute tools trigger processes. Rate-limit and validate arguments to prevent unintended side effects.

io-github-jrigada-foundry-zksync.yaml

tools:
  anvil_zksync:
    rules:
      - action: allow
        rate_limit:
          max: 10
          window: 60
        validate:
          required_args: true

See the full Foundry Zksync policy for all 21 tools.

// DETAILS

Tool Name anvil_zksync

Category Execute

MCP Server Foundry Zksync MCP Server

Risk Level High

// MORE FOUNDRY ZKSYNC TOOLS

Destructive clean Execute cast_nonce Execute compile Execute deploy Execute gas_report Execute run_script Write cast_send Write init

View all 21 tools →

// WHAT CAN GO WRONG

Agents calling execute-class tools like anvil_zksync have been implicated in these attack patterns. Read the full case and prevention policy for each:

Browse the full MCP Attack Database →

// OTHER EXECUTE TOOLS ACROSS MCP SERVERS

Other tools in the Execute risk category across the catalogue. The same policy patterns (rate-limit, validate) apply to each.

Agent Passport System — Cryptographic Identity for AI Agents commerce_preflight Agent Passport System — Cryptographic Identity for AI Agents execute_with_context Agent Passport System — Cryptographic Identity for AI Agents gateway_execute_approval Agent Passport System — Cryptographic Identity for AI Agents governance_360 Agent Passport System — Cryptographic Identity for AI Agents parse_governance_block_html AgentClear — API Marketplace for AI Agents call_service

// IN CONTEXT OF HIGH RISK

anvil_zksync is one of the high-risk operations in Foundry Zksync. For the full severity-focused view — only the high-risk tools with their recommended policies — see the breakdown for this server, or browse all high-risk tools across every MCP server.

// RELATED READING

// FAQ

What does the anvil_zksync tool do? +

Start or check a local anvil-zksync development node. Supports forking from mainnet/testnet. Default port: 8011.. It is categorised as a Execute tool in the Foundry Zksync MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on anvil_zksync? +

Add a rule in your Intercept YAML policy under the tools section for anvil_zksync. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Foundry Zksync MCP server.

What risk level is anvil_zksync? +

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

Can I rate-limit anvil_zksync? +

Yes. Add a rate_limit block to the anvil_zksync rule in your Intercept 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 anvil_zksync completely? +

Set action: deny in the Intercept policy for anvil_zksync. 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 anvil_zksync? +

anvil_zksync is provided by the Foundry Zksync MCP server (foundry-zksync-mcp). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.

anvil_zksync

Enforce policies on Foundry Zksync