create_or_update_file

Create or update a file in a GitHub repository

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/create-or-update-file.md

WHAT IT DOES

What create_or_update_file does on Ncp

AI agents use create_or_update_file 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 create_or_update_file is rated Medium

The tool creates or modifies files in a repository, which are reversible changes. It does not delete data (which would be Destructive) or execute arbitrary code (which would be Execute). However, the severity is medium rather than low because modifying repository files can have downstream effects on CI/CD pipelines, deployments, or collaborative workflows if an agent uses it maliciously or erroneously.

From the tool's definition Tool description explicitly states 'Create or update a file in a GitHub repository' — these are reversible write operations (create, update).

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_or_update_file 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 create_or_update_file, this is the rule to start with:

create_or_update_file Rate-limited

create_or_update_file 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": {
    "create_or_update_file": {
      "limits": [
        {
          "counter": "create_or_update_file_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 create_or_update_file call is checked against it from then on.

FAQ

Questions about create_or_update_file

What does the create_or_update_file tool do? +

Create or update a file in a GitHub repository. 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 create_or_update_file? +

Register the Ncp MCP server in PolicyLayer and add a rule for create_or_update_file: 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 create_or_update_file? +

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

Can I rate-limit create_or_update_file? +

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

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

create_or_update_file 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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