write_points

Write time series data points

SERVERNcp SOURCE@portel/ncp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-portel-dev-ncp/write-points.md

WHAT IT DOES

What write_points does on Ncp

AI agents use write_points to create or update resources in Ncp, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Ncp environment.

RISK

Why write_points is rated Medium

This tool creates or modifies time series data, which is a Write operation. The severity is medium because unauthorized writes to time series data could affect monitoring, analytics, or operational systems, but the impact is typically recoverable through backups or data correction.

From the tool's definition Tool name 'write_points' and description 'Write time series data points' indicate creating or modifying data. The verb 'write' combined with 'data points' suggests reversible data creation/modification, not deletion or financial operations.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs write_points safely

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

write_points Rate-limited

write_points stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "write_points": {
      "limits": [
        {
          "counter": "write_points_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about write_points

What does the write_points tool do? +

Write time series data points. It is categorised as a Write tool in the Ncp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on write_points? +

Register the Ncp MCP server in PolicyLayer and add a rule for write_points: 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 Ncp. Nothing to install.

What risk level is write_points? +

write_points is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit write_points? +

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

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

write_points is provided by the Ncp MCP server (@portel/ncp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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