linear_createComment · Linear MCP Server MCP: Risk & Policy

WHAT IT DOES

What linear_createComment does on Linear MCP Server

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

WHY IT NEEDS A POLICY

Why linear_createComment needs a policy

This tool creates new content (comments) within the Linear project management system, modifying the issue's discussion thread. While it does not delete data or cause irreversible changes, it does add persistent data to the system. This is a Write operation because it creates new information.

From the tool's definition Tool description states 'Add a comment to an issue in Linear' — this creates new data (a comment) that is attached to an issue. The action is reversible (comments can be edited or deleted).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

linear_createComment Rate-limited

linear_createComment 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": {
    "linear_createComment": {
      "limits": [
        {
          "counter": "linear_createcomment_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Linear MCP Server, so you can run agents against it safely.

FAQ

Questions about linear_createComment

What does the linear_createComment tool do? +

Add a comment to an issue in Linear. It is categorised as a Write tool in the Linear MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on linear_createComment? +

Register the Linear MCP Server MCP server in PolicyLayer and add a rule for linear_createComment: 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 Linear MCP Server. Nothing to install.

What risk level is linear_createComment? +

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

Can I rate-limit linear_createComment? +

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

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

linear_createComment is provided by the Linear MCP Server MCP server (wkoutre/linear-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.