AI agents use update_memory to create or update resources in CyberMem — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your CyberMem environment.
The tool creates or modifies data reversibly by updating memory entries. While this could impact AI agent behavior across sessions, the modification is not destructive (the original memory record is not permanently deleted), not financially consequential, and does not execute external code.
From the tool's definition Tool name: 'update_memory'. Description: 'Update an existing memory'. This modifies existing data (memory records) but does not permanently delete or destroy them, and does not execute arbitrary code or move money.
Documented attack patterns abuse exactly the kind of access update_memory gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and CyberMem, and nothing reaches the server without passing your rules. This is the rule we recommend for update_memory:
{
"version": "1",
"default": "deny",
"tools": {
"update_memory": {
"limits": [
{
"counter": "update_memory_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_memory 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 memory. It is categorised as a Write tool in the CyberMem MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the CyberMem MCP server in PolicyLayer and add a rule for update_memory: 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 CyberMem. Nothing to install.
update_memory 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_memory 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_memory. 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_memory is provided by the CyberMem MCP server (mikhailkogan17/cybermem). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from CyberMem, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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5 CyberMem tools catalogued and risk-classified — across an index of 43,000+ MCP servers.