AI agents use create_paragraph to create or update resources in Narrarium — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Narrarium environment.
This tool creates new markdown files and adds content to an existing chapter structure. This is a reversible write operation—files can be edited or deleted afterward. It does not execute code, destroy data irreversibly, or move money. The medium severity reflects that misuse could corrupt a book manuscript structure or create unwanted content within chapters, but the effects are recoverable.
From the tool's definition Tool description explicitly states it will 'Create a numbered paragraph or scene markdown file inside an existing chapter folder,' indicating file creation and modification of chapter content.
Attacks that exploit this kind of access
Create a numbered paragraph or scene markdown file inside an existing chapter folder. In prose bodies, keep canon names as plain text instead of markdown links to canon files. It is categorised as a Write tool in the Narrarium MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Narrarium MCP server in PolicyLayer and add a rule for create_paragraph: 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 Narrarium. Nothing to install.
create_paragraph 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 create_paragraph 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 create_paragraph. 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.
create_paragraph is provided by the Narrarium MCP server (narrarium-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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