get_ssr_info

THE RISK

Low Risk

Why get_ssr_info needs a policy

This tool queries existing metadata about CSS class patterns and their SSR compatibility. It has no side effects, does not execute code, does not modify data, and does not create financial obligations. It is a straightforward informational lookup, consistent with the 'Read' category for tools that retrieve or query data without side effects.

From the tool's definition Tool retrieves SSR/hydration safety information without modifying state or triggering side effects. The description explicitly states 'Get' information, and the use case is for checking safety during development, not for executing operations or modifying…

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

POLICY

How to control get_ssr_info

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

policy.json

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

get_ssr_info 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 Classmcp — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

More Classmcp tools

Execute reload_config Reload custom patterns from the config file (.classmcp.json). Use this after modifying you Write generate_css Generate CSS that defines all semantic classes. Add this to your project Write set_framework Set the CSS framework to use for all subsequent operations. Choose based on your project Read get_class Get the full utility classes for a semantic class name. Returns the CSS classes you should Read get_component Get a complete HTML component example using semantic classes. Great for seeing how classes Read list_classes List all available semantic class names, optionally filtered by category. Use this to disc Read list_custom_patterns List all custom (user-defined) patterns loaded from your config file. Read list_frameworks List all available CSS frameworks and their statistics.

All 10 Classmcp 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 get_ssr_info

What does the get_ssr_info tool do? +

Get SSR/hydration safety information for a class pattern. Use this when building SSR/Next.js/Nuxt/Remix applications to avoid hydration mismatches. It is categorised as a Read tool in the Classmcp MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_ssr_info? +

Register the Class MCP server in PolicyLayer and add a rule for get_ssr_info: 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 Classmcp. Nothing to install.

What risk level is get_ssr_info? +

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

Can I rate-limit get_ssr_info? +

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

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

get_ssr_info is provided by the Class MCP server (thedecipherist/classmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Classmcp tool call.

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

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