add_thread_reply

Add a reply to a message thread. Reply body supports markdown formatting.

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-thread-reply.md

WHAT IT DOES

What add_thread_reply does on Huly

AI agents use add_thread_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_thread_reply is rated Medium

This tool creates new data (a thread reply) without deleting or overwriting existing content, making it a Write action. Severity is medium because while message threads are typically low-stakes communication, a compromised agent could spam, harass, or inject malicious content into collaborative workspaces, affecting team productivity and trust.

From the tool's definition Tool description states 'Add a reply to a message thread', which creates new content (a reply message) in a reversible manner. The markdown formatting capability indicates this is composing and storing user-generated content.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs add_thread_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_thread_reply, this is the rule to start with:

add_thread_reply Rate-limited

add_thread_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_thread_reply": {
      "limits": [
        {
          "counter": "add_thread_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_thread_reply call is checked against it from then on.

FAQ

Questions about add_thread_reply

What does the add_thread_reply tool do? +

Add a reply to a message thread. Reply body supports markdown formatting. 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_thread_reply? +

Register the Huly MCP server in PolicyLayer and add a rule for add_thread_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_thread_reply? +

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

Can I rate-limit add_thread_reply? +

Yes. Add a rate_limit block to the add_thread_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_thread_reply completely? +

Set action: deny in the PolicyLayer policy for add_thread_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_thread_reply? +

add_thread_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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