add_issue_comment

THE RISK

Medium Risk

Why add_issue_comment needs a policy

Adding a comment is a write operation that creates new data and modifies the issue's state, but the action is fully reversible (comments can be edited or deleted). It does not permanently delete data or execute arbitrary code, so it does not qualify as Destructive or Execute.

From the tool's definition Tool description states 'Add a comment to an existing issue' — this creates new data (a comment) that modifies an issue by appending reversible content.

Documented attack patterns abuse exactly the kind of access add_issue_comment gives an agent:

POLICY

How to control add_issue_comment

PolicyLayer is an MCP gateway — it sits between your AI agents and Claude TypeScript MCP Servers, and nothing reaches the server without passing your rules. This is the rule we recommend for add_issue_comment:

policy.json

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

add_issue_comment 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.

Create a free account and register Claude TypeScript MCP Servers — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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All 84 Claude TypeScript MCP Servers tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about add_issue_comment

What does the add_issue_comment tool do? +

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

How do I enforce a policy on add_issue_comment? +

Register the Claude TypeScript MCP Servers MCP server in PolicyLayer and add a rule for add_issue_comment: 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 Claude TypeScript MCP Servers. Nothing to install.

What risk level is add_issue_comment? +

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

Can I rate-limit add_issue_comment? +

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

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

add_issue_comment is provided by the Claude TypeScript MCP Servers MCP server (ukkz/claude-ts-mcps). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Claude TypeScript MCP Servers tool call.

Start from Claude TypeScript MCP Servers, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →