join_channel

Join a non-archived Huly channel as the authenticated account. Idempotent when the account is already a member.

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/join-channel.md

WHAT IT DOES

What join_channel does on Huly

AI agents use join_channel 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 join_channel is rated Medium

Joining a channel modifies membership state (adds the authenticated user to a channel), which is a reversible write operation. It is not destructive, financial, or executing code. Severity is medium because it changes access/membership state but is idempotent and reversible.

From the tool's definition Join a non-archived Huly channel as the authenticated account. Idempotent when the account is already a member.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

join_channel Rate-limited

join_channel 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": {
    "join_channel": {
      "limits": [
        {
          "counter": "join_channel_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 join_channel call is checked against it from then on.

FAQ

Questions about join_channel

What does the join_channel tool do? +

Join a non-archived Huly channel as the authenticated account. Idempotent when the account is already a member. 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 join_channel? +

Register the Huly MCP server in PolicyLayer and add a rule for join_channel: 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 join_channel? +

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

Can I rate-limit join_channel? +

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

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

join_channel 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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