update_issue · Magnet MCP: Risk & Policy

WHAT IT DOES

What update_issue does on Magnet

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

WHY IT NEEDS A POLICY

Why update_issue needs a policy

This tool creates or modifies data (an issue) in a reversible manner without deleting it or executing arbitrary code. It falls clearly into the Write category. Severity is medium because misuse could corrupt or deface issue records, but the impact is limited to a single issue and reversible. Confidence is high because the intent and effect are explicit in the description.

From the tool's definition Tool name is 'update_issue' and description states 'Update an existing issue in Magnet'. The description explicitly indicates this modifies data reversibly: 'Only provided fields will be updated', meaning changes can be undone or overwritten later.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_issue Rate-limited

update_issue 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": {
    "update_issue": {
      "limits": [
        {
          "counter": "update_issue_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 Magnet, so you can run agents against it safely.

FAQ

Questions about update_issue

What does the update_issue tool do? +

Update an existing issue in Magnet using markdown content. Only provided fields will be updated. Supports standard markdown syntax including headings, lists, code blocks, links, etc. It is categorised as a Write tool in the Magnet MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_issue? +

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

What risk level is update_issue? +

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

Can I rate-limit update_issue? +

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

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

update_issue is provided by the Magnet MCP server (@magnet-ai/magnet-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.