vivado_run_tcl · Vivado Mcp Agent MCP: Risk & Policy

WHAT IT DOES

What vivado_run_tcl does on Vivado Mcp Agent

AI agents invoke vivado_run_tcl to trigger actions in Vivado Mcp Agent. 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 vivado_run_tcl needs a policy

The tool executes Tcl scripts in Vivado, a professional FPGA design tool. While the whitelist restriction limits attack surface, Tcl scripts can invoke complex CAD operations, modify design state, trigger hardware generation, and potentially interact with external tools or the filesystem.

From the tool's definition Tool description states 'Run a whitelisted Tcl script through vivado.bat' — this executes arbitrary Tcl code within the Vivado environment, which can trigger external operations, simulations, synthesis, and implementation workflows whose effects depend on…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

vivado_run_tcl Rate-limited

vivado_run_tcl 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": {
    "vivado_run_tcl": {
      "limits": [
        {
          "counter": "vivado_run_tcl_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 Vivado Mcp Agent, so you can run agents against it safely.

FAQ

Questions about vivado_run_tcl

What does the vivado_run_tcl tool do? +

Run a whitelisted Tcl script through vivado.bat with timeout and captured logs. It is categorised as a Execute tool in the Vivado Mcp Agent MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on vivado_run_tcl? +

Register the Vivado Mcp Agent MCP server in PolicyLayer and add a rule for vivado_run_tcl: 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 Vivado Mcp Agent. Nothing to install.

What risk level is vivado_run_tcl? +

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

Can I rate-limit vivado_run_tcl? +

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

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

vivado_run_tcl is provided by the Vivado Mcp Agent MCP server (wangyuxin0707/vivado-mcp-agent). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.