retrieveUserInfoFromAccessTokenWithId
Call the UserInfo endpoint to retrieve User Claims from the access token issued by FusionAuth.
This record as markdown: /tools/io-fusionauth-mcp-api/retrieveuserinfofromaccesstokenwithid.md
What retrieveUserInfoFromAccessTokenWithId does on Fusionauth
AI agents call retrieveUserInfoFromAccessTokenWithId 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 retrieveUserInfoFromAccessTokenWithId is rated Low
This tool queries and returns user information derived from an access token. It is a read-only operation that retrieves data without modifying, deleting, or executing any external operations. The blast radius of misuse is limited to exposure of user claims data already authorized by the access token.
From the tool's definition Tool description states it 'retrieve[s] User Claims from the access token' — a pure retrieval operation with no modifications or side effects.
Attacks that exploit this kind of access
The rule that runs retrieveUserInfoFromAccessTokenWithId 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 retrieveUserInfoFromAccessTokenWithId, this is the rule to start with:
retrieveUserInfoFromAccessTokenWithId 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 retrieveUserInfoFromAccessTokenWithId call is checked against it from then on.
Questions about retrieveUserInfoFromAccessTokenWithId
Call the UserInfo endpoint to retrieve User Claims from the access token issued by FusionAuth. 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 retrieveUserInfoFromAccessTokenWithId: 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.
retrieveUserInfoFromAccessTokenWithId 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 retrieveUserInfoFromAccessTokenWithId 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 retrieveUserInfoFromAccessTokenWithId. 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.
retrieveUserInfoFromAccessTokenWithId 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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