show_api_key

THE RISK

Low Risk

Why show_api_key needs a policy

While technically a read operation (retrieves data without modification), this tool exposes API credentials that grant full access to Jina AI services and potentially authenticated resources. Unauthorized access to API keys enables attackers to impersonate legitimate users, consume quota, access restricted content, and pivot to other systems.

From the tool's definition Tool returns 'bearer token from the Authorization header' which is a sensitive credential used for API authentication.

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

POLICY

How to control show_api_key

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

policy.json

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

show_api_key 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 Jina AI Remote 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 Jina AI Remote MCP Server tools

Read capture_screenshot_url Capture high-quality screenshots of web pages in base64 encoded JPEG format. Use this tool Read classify_text Classify texts into user-defined labels using Jina embeddings. Use this when you need to c Read deduplicate_images Get top-k semantically unique images (URLs or base64-encoded) using Jina CLIP v2 embedding Read deduplicate_strings Get top-k semantically unique strings from a list using Jina embeddings and submodular opt Read expand_query Expand and rewrite search queries based on an up-to-date query expansion model. This tool Read extract_pdf Extract figures, tables, and equations from PDF documents using layout detection. Perfect Read parallel_read_url Read multiple web pages in parallel to extract clean content efficiently. For best results Read parallel_search_arxiv Run multiple arXiv searches in parallel for comprehensive research coverage and diverse ac

All 21 Jina AI Remote 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 show_api_key

What does the show_api_key tool do? +

Return the bearer token from the Authorization header of the MCP settings, which is used to debug. It is categorised as a Read tool in the Jina AI Remote MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on show_api_key? +

Register the Jina AI Remote MCP Server MCP server in PolicyLayer and add a rule for show_api_key: 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 Jina AI Remote MCP Server. Nothing to install.

What risk level is show_api_key? +

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

Can I rate-limit show_api_key? +

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

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

show_api_key is provided by the Jina AI Remote MCP Server MCP server (jina-ai/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Jina AI Remote MCP Server tool call.

Start from Jina AI Remote 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 →