AI agents use switch_mode 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 performs a reversible state modification (switching modes) rather than querying data (Read), executing arbitrary code (Execute), or permanently deleting data (Destructive). This is a Write operation as it changes system state. Severity is medium because mode switches could alter subsequent tool behavior and data handling, but the operation is reversible.
From the tool's definition Tool name 'switch_mode' with description 'Switches to a specific mode' indicates a state-changing operation. The context of Memory Bank MCP suggests this modifies configuration or operational state.
Documented attack patterns abuse exactly the kind of access switch_mode 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 switch_mode:
{
"version": "1",
"default": "deny",
"tools": {
"switch_mode": {
"limits": [
{
"counter": "switch_mode_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}switch_mode 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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Switches to a specific mode. 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 switch_mode: 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.
switch_mode 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 switch_mode 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 switch_mode. 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.
switch_mode 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.
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15 Memory Bank MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.