emit-app-event

Emit an app event to the ChannelEventBus for testing channel sources

SERVERFrontmcp SOURCEagentfront/frontmcp

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/frontmcp/emit-app-event.md

WHAT IT DOES

What emit-app-event does on Frontmcp

AI agents invoke emit-app-event to trigger actions in Frontmcp. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

RISK

Why emit-app-event is rated High

This tool triggers external operations by emitting events into an event bus, which can cause downstream effects depending on what event handlers are subscribed. It's not merely reading or writing data — it actively fires events that drive application behavior, making it an Execute-category action.

From the tool's definition "Emit an app event to the ChannelEventBus for testing channel sources"

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs emit-app-event safely

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

emit-app-event Rate-limited

emit-app-event stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "emit-app-event": {
      "limits": [
        {
          "counter": "emit-app-event_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Frontmcp, apply this rule, and every emit-app-event call is checked against it from then on.

FAQ

Questions about emit-app-event

What does the emit-app-event tool do? +

Emit an app event to the ChannelEventBus for testing channel sources. It is categorised as a Execute tool in the Frontmcp MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on emit-app-event? +

Register the Front MCP server in PolicyLayer and add a rule for emit-app-event: 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 Frontmcp. Nothing to install.

What risk level is emit-app-event? +

emit-app-event is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit emit-app-event? +

Yes. Add a rate_limit block to the emit-app-event 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 emit-app-event completely? +

Set action: deny in the PolicyLayer policy for emit-app-event. 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 emit-app-event? +

emit-app-event is provided by the Front MCP server (agentfront/frontmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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