Subscribe to a Firebird event (POST_EVENT) to receive proactive notifications
AI agents invoke subscribe_to_event to trigger actions in Mcp Firebird. 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.
| Parameter | Type | Required | Description |
|---|---|---|---|
eventName | string | Yes | The name of the Firebird event to subscribe to (e.g. 'NEW_ORDER', 'CLIENT_UPDATED') |
Parameters from the server's own tool schema.
Subscribing to a database event sets up an ongoing external operation (a listener for POST_EVENT signals) that affects system state and resource usage. This is not a simple read, nor does it write/modify data or delete anything. It triggers an external mechanism that causes the system to proactively push notifications, making it an Execute-category action.
From the tool's definition 'Subscribe to a Firebird event (POST_EVENT) to receive proactive notifications' — triggers an external subscription operation that establishes a persistent listener/connection in the database system
Attacks that exploit this kind of access
Subscribe to a Firebird event (POST_EVENT) to receive proactive notifications. It is categorised as a Execute tool in the Mcp Firebird MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
subscribe_to_event accepts 1 parameter: eventName. Required: eventName. The full parameter table on this page comes from the server's own tool schema.
Register the Mcp Firebird MCP server in PolicyLayer and add a rule for subscribe_to_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 Mcp Firebird. Nothing to install.
subscribe_to_event is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the subscribe_to_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.
Set action: deny in the PolicyLayer policy for subscribe_to_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.
subscribe_to_event is provided by the Mcp Firebird MCP server (mcp-firebird). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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