hover

Get hover information (type info, documentation) for a symbol by name. MUCH FASTER than reading entire files when you just need to understand a function signature or type

ServerMCP Server for VS Code
CategoryRead

How to control hover ↓

WHAT IT DOES

What hover does on MCP Server for VS Code

AI agents call hover to retrieve information from MCP Server for VS Code without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why hover needs a policy

This tool only retrieves metadata about code symbols (types, documentation, signatures). It performs no modifications, executions, deletions, or financial operations. The capability is purely informational lookup, analogous to hovering over code in an IDE to view type hints and docstrings. There is no blast radius from misuse—the worst outcome would be retrieving unwanted information.

From the tool's definition The tool 'hover' retrieves hover information including 'type info, documentation' for a symbol. The description explicitly states it is used to 'understand a function signature or type', which are read-only queries with no side effects.

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

POLICY

How to control hover

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

policy.json

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

hover 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 MCP Server for VS Code — 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 MCP Server for VS Code tools

Destructive debug_clearBreakpoints Remove all breakpoints from the workspace Execute debug_evaluateExpression Evaluate an expression in the current debug context (REPL/watch functionality). Test hypot Execute debug_startSession Start a debug session using a configuration from launch.json. Launch debugging instantly - Execute debug_stepOver Step over the current line of code (execute current line without entering functions) Execute debug_stopSession Stop the current debug session Execute debug_continueExecution Continue execution from the current breakpoint or paused state Execute debug_pauseExecution Pause the running debug session at the current execution point Execute debug_stepInto Step into function calls on the current line

All 25 MCP Server for VS Code 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 hover

What does the hover tool do? +

Get hover information (type info, documentation) for a symbol by name. MUCH FASTER than reading entire files when you just need to understand a function signature or type. It is categorised as a Read tool in the MCP Server for VS Code MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on hover? +

Register the MCP Server for VS Code MCP server in PolicyLayer and add a rule for hover: 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 MCP Server for VS Code. Nothing to install.

What risk level is hover? +

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

Can I rate-limit hover? +

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

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

hover is provided by the MCP Server for VS Code MCP server (malvex/mcp-server-vscode). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Server for VS Code tool call.

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

CHECK YOUR STACK →

Free to start. No card required.

25 MCP Server for VS Code tools catalogued and risk-classified — across an index of 43,000+ MCP servers.