previewMiniprogram · Tcsas Devtools MCP: Risk & Policy

WHAT IT DOES

What previewMiniprogram does on Tcsas Devtools

AI agents invoke previewMiniprogram to trigger actions in Tcsas Devtools. 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.

WHY IT NEEDS A POLICY

Why previewMiniprogram needs a policy

This tool triggers an external build/preview operation on a miniprogram project, executing a compilation and packaging process that produces a QR code artifact. It goes beyond a simple read — it actively runs a build pipeline against project files. The blast radius is medium since misuse could trigger unintended builds or expose preview artifacts, but it does not modify source data or incur financial costs.

From the tool's definition Generates a preview of the miniprogram at the given project path... this process can take 60-80 seconds to complete

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

previewMiniprogram Rate-limited

previewMiniprogram 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.

View as policy code

policy.json

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

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Tcsas Devtools, so you can run agents against it safely.

FAQ

Questions about previewMiniprogram

What does the previewMiniprogram tool do? +

Generates a preview of the miniprogram at the given project path. It returns a QR code as an image that can be scanned to view the preview. Please note that this process can take 60-80 seconds to complete. It is categorised as a Execute tool in the Tcsas Devtools MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on previewMiniprogram? +

Register the Tcsas Devtools MCP server in PolicyLayer and add a rule for previewMiniprogram: 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 Tcsas Devtools. Nothing to install.

What risk level is previewMiniprogram? +

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

Can I rate-limit previewMiniprogram? +

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

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

previewMiniprogram is provided by the Tcsas Devtools MCP server (tcmpp-team/tcsas-devtools-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.