AI agents invoke xdc_auto_fix to trigger actions in Vivado. 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.
XDC files are constraint files used in FPGA design; auto-fixing them likely involves modifying these files (Write) or executing Tcl commands within Vivado to apply fixes (Execute). Given the server context of Tcl execution and FPGA development, this likely triggers automated changes. Empty description lowers confidence significantly.
From the tool's definition Tool name 'xdc_auto_fix' suggests automated modification of XDC (Xilinx Design Constraints) files, but the description is empty and uninformative.
Documented attack patterns abuse exactly the kind of access xdc_auto_fix gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Vivado, and nothing reaches the server without passing your rules. This is the rule we recommend for xdc_auto_fix:
{
"version": "1",
"default": "deny",
"tools": {
"xdc_auto_fix": {
"limits": [
{
"counter": "xdc_auto_fix_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}xdc_auto_fix 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.
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xdc_auto_fix. It is categorised as a Execute tool in the Vivado MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Vivado MCP server in PolicyLayer and add a rule for xdc_auto_fix: 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. Nothing to install.
xdc_auto_fix is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the xdc_auto_fix 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.
Set action: deny in the PolicyLayer policy for xdc_auto_fix. 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.
xdc_auto_fix is provided by the Vivado MCP server (mapleleavessssssss-wq/vivado-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Vivado, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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27 Vivado tools catalogued and risk-classified — across an index of 43,000+ MCP servers.