search_classes

THE RISK

Low Risk

Why search_classes needs a policy

This tool retrieves information from an indexed C++ codebase without modifying any data or executing code. It is purely informational, similar to grep or symbol lookup. The regex support is for search filtering only, not for code execution. The worst-case misuse scenario (e.g., an agent learning sensitive class names) poses minimal direct harm and falls well within the 'low' severity threshold.

From the tool's definition Tool searches for C++ classes by name pattern and returns semantic information about a codebase. The description contains verbs 'search' and 'find', which are read-only query operations.

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

POLICY

How to control search_classes

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "search_classes": {}
  }
}

search_classes is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register C++ MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More C++ MCP Server tools

Execute refresh_project Manually refresh/re-parse project files to detect changes Write set_project_directory Set the project directory to analyze (use this first before other commands) Read find_callees Find all functions called by a specific function Read find_callers Find all functions that call a specific function Read find_in_file Search for symbols within a specific file Read get_call_path Find call paths from one function to another Read get_class_hierarchy Get complete inheritance hierarchy for a C++ class Read get_class_info Get detailed information about a specific class

All 14 C++ MCP Server tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about search_classes

What does the search_classes tool do? +

Search for C++ classes by name pattern (regex supported). It is categorised as a Read tool in the C++ MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on search_classes? +

Register the C++ MCP Server MCP server in PolicyLayer and add a rule for search_classes: 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 C++ MCP Server. Nothing to install.

What risk level is search_classes? +

search_classes is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit search_classes? +

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

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

search_classes is provided by the C++ MCP Server MCP server (kandrwmrtn/cplusplus_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every C++ MCP Server tool call.

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

CHECK YOUR STACK →