retrieveWebhook
Retrieves the webhook for the given Id. If you pass in null for the Id, this will return all the webhooks.
This record as markdown: /tools/io-fusionauth-mcp-api/retrievewebhook.md
What retrieveWebhook does on Fusionauth
AI agents call retrieveWebhook to retrieve information from Fusionauth without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why retrieveWebhook is rated Low
This tool only queries and returns webhook configuration data. It performs no creation, modification, deletion, code execution, or financial operations. The worst-case misuse (retrieving all webhooks) exposes webhook configuration but causes no irreversible harm or external actions. Severity is low due to limited blast radius unless webhook data itself contains sensitive credentials.
From the tool's definition Tool name contains 'Retrieve' and description explicitly states 'Retrieves the webhook' with no mutation or deletion capability. Returns data (single webhook by Id or all webhooks if Id is null) without side effects.
Attacks that exploit this kind of access
The rule that runs retrieveWebhook safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Fusionauth, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For retrieveWebhook, this is the rule to start with:
retrieveWebhook is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Fusionauth, apply this rule, and every retrieveWebhook call is checked against it from then on.
Questions about retrieveWebhook
Retrieves the webhook for the given Id. If you pass in null for the Id, this will return all the webhooks. It is categorised as a Read tool in the Fusionauth MCP Server, which means it retrieves data without modifying state.
Register the Fusionauth MCP server in PolicyLayer and add a rule for retrieveWebhook: 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 Fusionauth. Nothing to install.
retrieveWebhook is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the retrieveWebhook 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 retrieveWebhook. 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.
retrieveWebhook is provided by the Fusionauth MCP server (@fusionauth/mcp-api). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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