AI agents use update_epic to create or update resources in Flux MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Flux MCP Server environment.
This tool modifies existing data (an epic) reversibly—updates can be undone by performing another update. It is not destructive (deletion is irreversible), not financial, and not execute (no code/command execution). The medium severity reflects that misuse could corrupt project planning data across multiple projects, but changes are recoverable.
From the tool's definition Tool name 'update_epic' and description 'Update an existing epic' indicate modification of existing data. The server description confirms it 'enables AI agents to create, update, list, and delete tasks' with 'multi-project management' scope.
Documented attack patterns abuse exactly the kind of access update_epic gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Flux MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for update_epic:
{
"version": "1",
"default": "deny",
"tools": {
"update_epic": {
"limits": [
{
"counter": "update_epic_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_epic 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.
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Update an existing epic. It is categorised as a Write tool in the Flux MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Flux MCP Server MCP server in PolicyLayer and add a rule for update_epic: 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 Flux MCP Server. Nothing to install.
update_epic 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 update_epic 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 update_epic. 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.
update_epic is provided by the Flux MCP Server MCP server (sirsjg/flux). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 25 Flux MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
25 Flux MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.