createApplication
Creates an application. You can optionally specify an Id for the application, if not provided one will be generated.
This record as markdown: /tools/io-fusionauth-mcp-api/createapplication.md
What createApplication does on Fusionauth
AI agents use createApplication to create or update resources in Fusionauth, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Fusionauth environment.
Why createApplication is rated Medium
The tool creates new application records in FusionAuth, which is a reversible write operation. It modifies application state by adding new entries to the system. While not destructive, the ability to create arbitrary applications in an identity/authentication system poses a high severity risk if misused by an AI agent, as it could create unauthorized applications that access user data or interfere with legitimate…
From the tool's definition Creates an application. You can optionally specify an Id for the application, if not provided one will be generated.
Attacks that exploit this kind of access
The rule that runs createApplication 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 createApplication, this is the rule to start with:
createApplication 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Fusionauth, apply this rule, and every createApplication call is checked against it from then on.
Questions about createApplication
Creates an application. You can optionally specify an Id for the application, if not provided one will be generated. It is categorised as a Write tool in the Fusionauth MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Fusionauth MCP server in PolicyLayer and add a rule for createApplication: 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.
createApplication is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the createApplication 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 createApplication. 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.
createApplication 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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