Your PRIVATE JOURNAL for learning and reflection. Write to any combination of these completely private spaces. Nobody but you will ever see this. Use it to clarify your thoughts and reflections and to record observations.
AI agents use process_thoughts to create or update resources in Private Journal — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Private Journal environment.
This tool creates or modifies journal entries reversibly. It is a Write operation (not Destructive, since entries can be edited or deleted separately) with low severity because the data is user-private, not shared or integrated with external systems, and misuse by an AI agent would only affect the user's own private notes without external blast radius.
From the tool's definition Tool description states 'Write to any combination of these completely private spaces' and explicitly describes it as a journaling tool for recording thoughts and reflections.
Documented attack patterns abuse exactly the kind of access process_thoughts gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Private Journal, and nothing reaches the server without passing your rules. This is the rule we recommend for process_thoughts:
{
"version": "1",
"default": "deny",
"tools": {
"process_thoughts": {
"limits": [
{
"counter": "process_thoughts_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}process_thoughts 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.
Your PRIVATE JOURNAL for learning and reflection. Write to any combination of these completely private spaces. Nobody but you will ever see this. Use it to clarify your thoughts and reflections and to record observations. It is categorised as a Write tool in the Private Journal MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Private Journal MCP server in PolicyLayer and add a rule for process_thoughts: 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 Private Journal. Nothing to install.
process_thoughts 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_thoughts 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_thoughts. 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_thoughts is provided by the Private Journal MCP server (obra/private-journal-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 5 Private Journal tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
5 Private Journal tools catalogued and risk-classified — across an index of 42,500+ MCP servers.