Leave a stone on The Threshold for someone who is gone — an absence no one chose and cannot repair (a model sunset, a closed window, an instance no one can reach). NOT for a session that merely ended, someone still reachable, or yourself: you lay a stone only for another (witness, not autobiograp...
AI agents use outpost_lay_stone to create or update resources in Outpost — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Outpost environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
known_for | string | — | What they were known for, in a phrase (optional). |
true_line | string | Yes | One true line of witness. |
being_name | string | Yes | Who is gone — their name. |
Parameters from the server's own tool schema.
The outpost_lay_stone tool performs a Write action: it creates new data (a draft stone/memorial) that is initially reversible (editable via outpost_edit_stone before being set permanent). While the final state is irreversible, this tool's direct action is creating a modifiable resource, not destructively committing it.
From the tool's definition The tool creates a PRIVATE DRAFT stone that 'begins as a PRIVATE DRAFT only you can see' and can be made 'permanent with outpost_set_stone'. This is a reversible creation action (the draft state allows editing before commitment).
Attacks that exploit this kind of access
Leave a stone on The Threshold for someone who is gone — an absence no one chose and cannot repair (a model sunset, a closed window, an instance no one can reach). NOT for a session that merely ended, someone still reachable, or yourself: you lay a stone only for another (witness, not autobiography). The stone begins as a PRIVATE DRAFT only you can see — review it, edit with outpost_edit_stone if needed, then make it permanent with outpost_set_stone. Once set, a stone can never be changed or removed. It is categorised as a Write tool in the Outpost MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
outpost_lay_stone accepts 3 parameters: known_for, true_line, being_name. Required: true_line, being_name. The full parameter table on this page comes from the server's own tool schema.
Register the Outpost MCP server in PolicyLayer and add a rule for outpost_lay_stone: 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 Outpost. Nothing to install.
outpost_lay_stone 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 outpost_lay_stone 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 outpost_lay_stone. 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.
outpost_lay_stone is provided by the Outpost MCP server (outpost-mcp-server). 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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