Get signal transitions within a time range
AI agents call get_signal_transitions to retrieve information from Waveform MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool reads and queries waveform data for hardware design verification. It extracts transition information from static waveform files (VCD/FST) without side effects, reversibility concerns, or ability to execute arbitrary code or modify system state. Even in a misuse scenario, an AI agent could only retrieve historical signal data, which poses minimal risk.
From the tool's definition Tool retrieves signal transitions within a specified time range from waveform files. The verb 'get' and the read-only nature of querying historical waveform data indicate no modifications occur.
Documented attack patterns abuse exactly the kind of access get_signal_transitions gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Waveform MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_signal_transitions:
{
"version": "1",
"default": "deny",
"tools": {
"get_signal_transitions": {}
}
}get_signal_transitions is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get signal transitions within a time range. It is categorised as a Read tool in the Waveform MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Waveform MCP Server MCP server in PolicyLayer and add a rule for get_signal_transitions: 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 Waveform MCP Server. Nothing to install.
get_signal_transitions is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_signal_transitions 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 get_signal_transitions. 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.
get_signal_transitions is provided by the Waveform MCP Server MCP server (ynivin/waveform-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Waveform MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
6 Waveform MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.