Insert a .nurbsSegment(controlPoints, opts?) call into an existing PathBuilder chain on the named chain_anchor variable. The call is injected at the END of the chain, immediately before any .close(). controlPoints is a Vec2[] (mm) — at least degree + 1 entries; controlPoints[0] must match the cur...
Risk signalsAccepts freeform code/query input (code)
Part of the Kernelcad server.
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AI agents use add_path_nurbs_segment to create or modify resources in Kernelcad. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call add_path_nurbs_segment repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Kernelcad.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"add_path_nurbs_segment": {
"limits": [
{
"counter": "add_path_nurbs_segment_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Kernelcad policy for all 48 tools.
These attack patterns abuse exactly the kind of access add_path_nurbs_segment gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Insert a .nurbsSegment(controlPoints, opts?) call into an existing PathBuilder chain on the named chain_anchor variable. The call is injected at the END of the chain, immediately before any .close(). controlPoints is a Vec2[] (mm) — at least degree + 1 entries; controlPoints[0] must match the current pen position within 1e-6 mm; the pen ends at controlPoints[N-1]. Optional degree defaults to 3; weights for rational NURBS (strictly positive); knots for an explicit clamped knot vector (length must equal controlPoints.length + degree + 1). Use for explicit B-spline outlines where the control net is the natural mental model (NURBS round-tripping, programmatic profile generation). Returns the modified code + diagnostics. Side-effect-free.. It is categorised as a Write tool in the Kernelcad MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Kernelcad MCP server in PolicyLayer and add a rule for add_path_nurbs_segment: 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 Kernelcad. Nothing to install.
add_path_nurbs_segment is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the add_path_nurbs_segment 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 add_path_nurbs_segment. 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.
add_path_nurbs_segment is provided by the Kernelcad MCP server (kernelcad). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 48 Kernelcad tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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