add_activity_reply

Add a Markdown reply to any activity message.

SERVERHuly SOURCE@firfi/huly-mcp

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-dearlordylord-huly-mcp/add-activity-reply.md

WHAT IT DOES

What add_activity_reply does on Huly

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

RISK

Why add_activity_reply is rated Medium

This tool creates or appends new data (a reply message) to an existing activity, which is a reversible write operation. It does not execute code, delete data, move money, or trigger external side effects beyond message creation. The 'any activity message' scope suggests moderate blast radius if misused to spam or impersonate, warranting medium severity.

From the tool's definition Tool name 'add_activity_reply' and description 'Add a Markdown reply to any activity message' indicate creation of new content (a reply/message).

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs add_activity_reply safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Huly, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For add_activity_reply, this is the rule to start with:

add_activity_reply Rate-limited

add_activity_reply 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": {
    "add_activity_reply": {
      "limits": [
        {
          "counter": "add_activity_reply_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 Huly, apply this rule, and every add_activity_reply call is checked against it from then on.

FAQ

Questions about add_activity_reply

What does the add_activity_reply tool do? +

Add a Markdown reply to any activity message. It is categorised as a Write tool in the Huly 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_activity_reply? +

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

What risk level is add_activity_reply? +

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

Can I rate-limit add_activity_reply? +

Yes. Add a rate_limit block to the add_activity_reply 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_activity_reply completely? +

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

add_activity_reply is provided by the Huly MCP server (@firfi/huly-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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