createDevice_authorize
Start the Device Authorization flow using a request body OR Start the Device Authorization flow using form-encoded parameters
This record as markdown: /tools/io-fusionauth-mcp-api/createdevice-authorize.md
What createDevice_authorize does on Fusionauth
AI agents invoke createDevice_authorize to trigger actions in Fusionauth. 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.
Why createDevice_authorize is rated High
This tool initiates a Device Authorization flow, which is an external operation that sets state in an authorization server and triggers a multi-step OAuth process. It's not a simple data write (reversible record creation) but rather the execution of an authentication/authorization workflow with external side effects. It spans Write and Execute; Execute is more appropriate given the flow initiation nature.
From the tool's definition Start the Device Authorization flow — triggers an external OAuth/authorization flow as a side effect
Attacks that exploit this kind of access
The rule that runs createDevice_authorize 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 createDevice_authorize, this is the rule to start with:
createDevice_authorize 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Fusionauth, apply this rule, and every createDevice_authorize call is checked against it from then on.
Questions about createDevice_authorize
Start the Device Authorization flow using a request body OR Start the Device Authorization flow using form-encoded parameters. It is categorised as a Execute tool in the Fusionauth MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Fusionauth MCP server in PolicyLayer and add a rule for createDevice_authorize: 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.
createDevice_authorize 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 createDevice_authorize 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 createDevice_authorize. 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.
createDevice_authorize 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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