Processes the Update Memory Bank (UMB) command
AI agents use process_umb_command to create or update resources in Memory Bank MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Memory Bank MCP environment.
The tool updates/modifies stored information in a Memory Bank, which is a write operation. It is not destructive (data can be modified again), not financial, and not execute (it processes a structured command rather than arbitrary code/shell execution). The severity is medium because misuse could corrupt session context or decision logs, but the impact is limited to a single user's memory bank and is reversible.
From the tool's definition Tool name is 'process_umb_command' where UMB stands for 'Update Memory Bank'. The description explicitly states it 'Processes the Update Memory Bank (UMB) command', indicating it modifies memory bank data.
Documented attack patterns abuse exactly the kind of access process_umb_command gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Memory Bank MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for process_umb_command:
{
"version": "1",
"default": "deny",
"tools": {
"process_umb_command": {
"limits": [
{
"counter": "process_umb_command_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}process_umb_command 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.
Free to start. No card required.
Processes the Update Memory Bank (UMB) command. It is categorised as a Write tool in the Memory Bank MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Memory Bank MCP server in PolicyLayer and add a rule for process_umb_command: 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 Memory Bank MCP. Nothing to install.
process_umb_command 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 process_umb_command 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 process_umb_command. 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.
process_umb_command is provided by the Memory Bank MCP server (movibe/memory-bank-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Memory Bank MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
15 Memory Bank MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.