openroad_cts

Runs clock tree synthesis (CTS) on a placed DEF file, reporting inserted clock buffers/nets and post-CTS timing slack.

SERVERMcp Openroad SOURCE@zesun33/mcp-openroad

Low RISK CLASS

Category Other

Parameters 72 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/zesun33-mcp-openroad/openroad-cts.md

WHAT IT DOES

What openroad_cts does on Mcp Openroad

AI agents call openroad_cts as a supporting operation in Mcp Openroad workflows.

Parameter	Type	Required	Description
`cwd`	string	—	Optional working directory.
`sdc_file`	string	—	Optional SDC timing constraints file path.
`output_def`	string	—	Output CTS DEF file path.
`placed_def`	string	Yes	Placed DEF file path (output of openroad_place).
`timeout_ms`	number	—	Timeout in milliseconds.
`top_module`	string	Yes	Name of the top-level module.
`clock_period_ns`	number	—	Target clock period in ns if no SDC provided (default: 1.0).

Parameters from the server's own tool schema.

RISK

Why openroad_cts is rated Low

Without any rule in front of it, every call an agent makes to openroad_cts happens silently: no trail, no cap, no way to know it misbehaved until something breaks downstream.

Risk signalsAccepts file system path (cwd)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs openroad_cts safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Mcp Openroad, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For openroad_cts, this is the rule to start with:

openroad_cts Rate-limited

openroad_cts gets a rate cap, and everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "openroad_cts": {
      "limits": [
        {
          "counter": "openroad_cts_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

SET A RULE FOR THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Mcp Openroad, apply this rule, and every openroad_cts call is checked against it from then on.

FAQ

Questions about openroad_cts

What does the openroad_cts tool do? +

Runs clock tree synthesis (CTS) on a placed DEF file, reporting inserted clock buffers/nets and post-CTS timing slack. It is categorised as a Other tool in the Mcp Openroad MCP Server, which means it performs auxiliary operations.

What parameters does openroad_cts accept? +

openroad_cts accepts 7 parameters: cwd, sdc_file, output_def, placed_def, timeout_ms, top_module, clock_period_ns. Required: placed_def, top_module. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on openroad_cts? +

Register the Mcp Openroad MCP server in PolicyLayer and add a rule for openroad_cts: 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 Mcp Openroad. Nothing to install.

What risk level is openroad_cts? +

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

Can I rate-limit openroad_cts? +

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

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

openroad_cts is provided by the Mcp Openroad MCP server (@zesun33/mcp-openroad). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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