write_to_today · Roam Research MCP Server MCP: Risk & Policy

WHAT IT DOES

What write_to_today does on Roam Research MCP Server

AI agents use write_to_today to create or update resources in Roam Research MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Roam Research MCP Server environment.

WHY IT NEEDS A POLICY

Why write_to_today needs a policy

The tool writes data to a Roam Research daily page, which is reversible (content can be edited or deleted later). This qualifies as Write rather than Destructive. Severity is medium because unintended writes could clutter or overwrite a user's daily notes, but the damage is recoverable.

From the tool's definition Tool name 'write_to_today' combined with sibling tool 'write_to_page' and server description stating 'write to Roam Research graphs' and 'adding blocks to existing or daily pages' indicates this tool creates or modifies data in a daily page.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

write_to_today Rate-limited

write_to_today 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "write_to_today": {
      "limits": [
        {
          "counter": "write_to_today_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Roam Research MCP Server, so you can run agents against it safely.

FAQ

Questions about write_to_today

What does the write_to_today tool do? +

write_to_today. It is categorised as a Write tool in the Roam Research MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on write_to_today? +

Register the Roam Research MCP Server MCP server in PolicyLayer and add a rule for write_to_today: 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 MCP Server. Nothing to install.

What risk level is write_to_today? +

write_to_today is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit write_to_today? +

Yes. Add a rate_limit block to the write_to_today 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.

How do I block write_to_today completely? +

Set action: deny in the PolicyLayer policy for write_to_today. 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.

What MCP server provides write_to_today? +

write_to_today is provided by the Roam Research MCP Server MCP server (mickm3n/roam-research-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.