modifyActionWithId
Modifies a temporal user action by changing the expiration of the action and optionally adding a comment to the action.
This record as markdown: /tools/io-fusionauth-mcp-api/modifyactionwithid.md
What modifyActionWithId does on Fusionauth
AI agents use modifyActionWithId 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 modifyActionWithId is rated Medium
This tool creates or modifies data in a reversible manner—changing action expiration times and adding comments are updates that can be undone or corrected. While it affects user actions in a security-sensitive system (FusionAuth is an identity/access management platform), the modifications are not destructive or permanent.
From the tool's definition Tool modifies a temporal user action by changing expiration and optionally adding comments. The description explicitly uses 'modifies,' indicating reversible data changes rather than irreversible deletion.
Attacks that exploit this kind of access
The rule that runs modifyActionWithId 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 modifyActionWithId, this is the rule to start with:
modifyActionWithId 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 modifyActionWithId call is checked against it from then on.
Questions about modifyActionWithId
Modifies a temporal user action by changing the expiration of the action and optionally adding a comment to the action. 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 modifyActionWithId: 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.
modifyActionWithId 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 modifyActionWithId 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 modifyActionWithId. 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.
modifyActionWithId 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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