add_code_block · Wolai MCP Server MCP: Risk & Policy

WHAT IT DOES

What add_code_block does on Wolai MCP Server

AI agents use add_code_block to create or update resources in Wolai MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Wolai MCP Server environment.

WHY IT NEEDS A POLICY

Why add_code_block needs a policy

This tool creates new content (a code block) within a page, making it a Write operation. While it modifies data, the action is reversible—the code block can be deleted or edited later. The severity is medium because misuse could inject unintended code blocks, spam, or obfuscate important pages, but the damage is recoverable and localized to Wolai pages.

From the tool's definition The tool 'add_code_block' has a description stating 'Add a code block to a page', which indicates it creates or modifies content on a page. The server description confirms it 'write[s]...pages' and supports 'content operations including block management'.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_code_block Rate-limited

add_code_block stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "add_code_block": {
      "limits": [
        {
          "counter": "add_code_block_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about add_code_block

What does the add_code_block tool do? +

Add a code block to a page. It is categorised as a Write tool in the Wolai MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_code_block? +

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

What risk level is add_code_block? +

add_code_block is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit add_code_block? +

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

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

add_code_block is provided by the Wolai MCP Server MCP server (wuchaoli/wolai-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.