add_comment_to_message

THE RISK

Medium Risk

Why add_comment_to_message needs a policy

This tool creates new content (a comment) in Basecamp, which is a Write operation. It does not delete, execute code, move money, or perform irreversible actions. Severity is medium because misuse could spam or pollute message threads with unwanted comments, affecting team communication, but the action is reversible (comments can typically be deleted).

From the tool's definition Tool name 'add_comment_to_message' and description 'Add a comment/reply to a message' indicate creation of new data (a comment) within an existing message thread. This is a reversible modification operation.

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

POLICY

How to control add_comment_to_message

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

policy.json

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

add_comment_to_message 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 Basecamp MCP Server — 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

Related tools and policies

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Destructive delete_webhook Delete a webhook Destructive remove_person_from_project Revoke access from one or more people for a project Write reposition_todo Change the position/order of a todo within its list Write add_comment_to_card Add a comment to a card Write add_comment_to_document Add a comment to a document Write add_comment_to_recording Add a comment to any Basecamp recording (universal comment tool) Write add_comment_to_todo Add a comment to a specific todo Write add_person_to_project Grant access to one or more people for a project

All 56 Basecamp MCP Server tools →

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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_comment_to_message

What does the add_comment_to_message tool do? +

Add a comment/reply to a message. It is categorised as a Write tool in the Basecamp 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 add_comment_to_message? +

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

What risk level is add_comment_to_message? +

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

Can I rate-limit add_comment_to_message? +

Yes. Add a rate_limit block to the add_comment_to_message 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_comment_to_message completely? +

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

add_comment_to_message is provided by the Basecamp MCP Server MCP server (qusaiisaleem/basecamp-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Basecamp MCP Server tool call.

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

CHECK YOUR STACK →