set_webhook · Solafon MCP: Risk & Policy

WHAT IT DOES

What set_webhook does on Solafon MCP

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

WHY IT NEEDS A POLICY

Why set_webhook needs a policy

The tool creates or modifies bot configuration (the webhook URL) rather than reading, executing arbitrary code, deleting data, or moving funds. It is a configuration write operation. Severity is medium because misconfiguration of webhooks could redirect bot events to an attacker-controlled server, potentially exposing messages and callbacks, but the operation itself is reversible (the webhook can be changed again).

From the tool's definition Tool name is 'set_webhook' and description states 'Configure the webhook URL where the bot receives events (messages, callbacks)'. This modifies configuration by setting/updating a webhook endpoint, which is a reversible write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_webhook Rate-limited

set_webhook 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": {
    "set_webhook": {
      "limits": [
        {
          "counter": "set_webhook_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Solafon MCP, so you can run agents against it safely.

FAQ

Questions about set_webhook

What does the set_webhook tool do? +

Configure the webhook URL where the bot receives events (messages, callbacks). It is categorised as a Write tool in the Solafon MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_webhook? +

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

What risk level is set_webhook? +

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

Can I rate-limit set_webhook? +

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

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

set_webhook is provided by the Solafon MCP server (solafon/solafon-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.