roam_update_page_markdown
Update an existing page with new markdown content using smart diff. Preserves block UIDs where possible and generates minimal changes. This is ideal for:\n- Syncing external markdown files to Roam\n- AI-assisted content updates that preserve references\n- Batch content modifications without losin...
This record as markdown: /tools/2b3pro-roam-research-mcp/roam-update-page-markdown.md
What roam_update_page_markdown does on Roam Research
AI agents use roam_update_page_markdown to create or update resources in Roam Research, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Roam Research environment.
Why roam_update_page_markdown is rated Medium
This tool creates or modifies data reversibly by updating page content in Roam Research. While it performs delete operations as part of its diff logic, the primary function is content modification (Write category). The high severity reflects the risk that an AI agent could maliciously overwrite significant portions of a user's knowledge graph.
From the tool's definition Tool description explicitly states it 'Update[s] an existing page' and 'Batch content modifications' to Roam Research pages.
Attacks that exploit this kind of access
The rule that runs roam_update_page_markdown safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Roam Research, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For roam_update_page_markdown, this is the rule to start with:
roam_update_page_markdown 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Roam Research, apply this rule, and every roam_update_page_markdown call is checked against it from then on.
Questions about roam_update_page_markdown
Update an existing page with new markdown content using smart diff. Preserves block UIDs where possible and generates minimal changes. This is ideal for:\n- Syncing external markdown files to Roam\n- AI-assisted content updates that preserve references\n- Batch content modifications without losing block references\n\nHow it works:\n1. Fetches existing page blocks\n2. Matches new content to existing blocks by text similarity\n3. Generates minimal create/update/move/delete operations\n4. Preserves UIDs for matched blocks (keeping references intact)\n\nIMPORTANT: Before using this tool, ensure that you have loaded into context the \. It is categorised as a Write tool in the Roam Research MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Roam Research MCP server in PolicyLayer and add a rule for roam_update_page_markdown: 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 Roam Research. Nothing to install.
roam_update_page_markdown 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 roam_update_page_markdown 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 roam_update_page_markdown. 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.
roam_update_page_markdown is provided by the Roam Research MCP server (2b3pro/roam-research-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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