Log a household expense or get a category summary. action=log records one expense; action=summary returns spend-by-category over the past N days.
AI agents use log_household_expense to create or update resources in Personal Brain — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Personal Brain environment.
The primary action is recording (writing) a new expense entry into the personal database. The summary action is read-only, but the most severe applicable category is Write. This is not Financial because it merely logs/tracks expenses rather than moving money or committing financial obligations.
From the tool's definition 'Log a household expense' and 'action=log records one expense' indicate creating/writing new expense records to a personal database.
Attacks that exploit this kind of access
Log a household expense or get a category summary. action=log records one expense; action=summary returns spend-by-category over the past N days. It is categorised as a Write tool in the Personal Brain MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Personal Brain MCP server in PolicyLayer and add a rule for log_household_expense: 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 Personal Brain. Nothing to install.
log_household_expense 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 log_household_expense 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 log_household_expense. 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.
log_household_expense is provided by the Personal Brain MCP server (phantomts/personal-brain-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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