// MCP TOOL REFERENCE

cdn_refresh

This function marks resources cached on CDN nodes as expired. When users access these resources again, the CDN nodes will fetch the latest version from the origin server and store them anew.

ServerQiniu MCP Server
CategoryExecute

How to control cdn_refresh ↓

WHAT CDN_REFRESH ON QINIU MCP SERVER DOES

AI agents invoke cdn_refresh to trigger actions in Qiniu MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

THE RISK

High Risk

This tool triggers an external CDN operation — invalidating/expiring cached resources across CDN nodes. It doesn't delete data, but it executes a cache purge operation with side effects on CDN infrastructure. Misuse could cause a thundering herd effect (mass origin fetches) or serve stale/unintended content versions, making it Execute with medium severity.

From the tool's definition marks resources cached on CDN nodes as expired... CDN nodes will fetch the latest version from the origin server

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

HOW TO CONTROL CDN_REFRESH

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "cdn_refresh": {
      "limits": [
        {
          "counter": "cdn_refresh_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

cdn_refresh stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Qiniu 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.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

More Qiniu MCP Server tools

Execute image_scale_by_percent image_scale_by_percent Execute image_scale_by_size image_scale_by_size Execute cdn_prefetch_urls Newly added resources are proactively retrieved by the CDN and stored on its cache nodes i Write fetch_object Fetch a http object to Qiniu bucket. Write live_streaming_bind_play_domain Bind a playback domain to a LiveStreaming bucket for live streaming. This allows you to co Write live_streaming_bind_push_domain Bind a push domain to a LiveStreaming bucket for live streaming. This allows you to config Write live_streaming_create_bucket Create a new bucket in LiveStreaming using S3-style API. The bucket will be created at htt Write live_streaming_create_stream Create a new stream in LiveStreaming using S3-style API. The stream will be created at htt

All 24 Qiniu MCP Server tools →

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Go deeper

High-risk tools in Qiniu MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

What does the cdn_refresh tool do? +

This function marks resources cached on CDN nodes as expired. When users access these resources again, the CDN nodes will fetch the latest version from the origin server and store them anew. It is categorised as a Execute tool in the Qiniu MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on cdn_refresh? +

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

What risk level is cdn_refresh? +

cdn_refresh is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit cdn_refresh? +

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

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

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

Enforce policy on every Qiniu MCP Server tool call.

Deterministic rules across all 24 Qiniu MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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cdn_refresh

// WHAT CDN_REFRESH ON QINIU MCP SERVER DOES

// THE RISK

// HOW TO CONTROL CDN_REFRESH

// EXPLORE