create_entry_with_attachments

THE RISK

Medium Risk

Why create_entry_with_attachments needs a policy

This tool creates new journal entries with attachments, which is a reversible write operation. It does not delete data (ruling out Destructive), does not execute arbitrary code (ruling out Execute), involves no financial transactions (ruling out Financial), and retrieves no data (ruling out Read).

From the tool's definition Tool name contains 'create' and description states 'Create a journal entry with file attachments', indicating creation of new data records in the Day One journal system.

Documented attack patterns abuse exactly the kind of access create_entry_with_attachments gives an agent:

POLICY

How to control create_entry_with_attachments

PolicyLayer is an MCP gateway — it sits between your AI agents and MCP-DayOne, and nothing reaches the server without passing your rules. This is the rule we recommend for create_entry_with_attachments:

policy.json

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

create_entry_with_attachments 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.

Create a free account and register MCP-DayOne — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

More MCP-DayOne tools

Write create_journal_entry Create a new entry in Day One journal with support for attachments, location, and metadata Write create_location_entry Create a journal entry with location coordinates Read get_entries_by_date Get journal entries for a specific date across multiple years ( Read get_entry_count Get the total number of entries in a journal Read get_entry_count_from_db Get actual entry count from Day One database Read list_journals List all available Day One journals Read list_journals_from_db List all journals from database with entry counts Read read_recent_entries Read recent journal entries from Day One database

All 10 MCP-DayOne tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about create_entry_with_attachments

What does the create_entry_with_attachments tool do? +

Create a journal entry with file attachments (photos, videos, audio, PDFs). It is categorised as a Write tool in the MCP-DayOne MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_entry_with_attachments? +

Register the MCP-DayOne MCP server in PolicyLayer and add a rule for create_entry_with_attachments: 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 MCP-DayOne. Nothing to install.

What risk level is create_entry_with_attachments? +

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

Can I rate-limit create_entry_with_attachments? +

Yes. Add a rate_limit block to the create_entry_with_attachments 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 create_entry_with_attachments completely? +

Set action: deny in the PolicyLayer policy for create_entry_with_attachments. 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 create_entry_with_attachments? +

create_entry_with_attachments is provided by the MCP-DayOne MCP server (quevin/mcp-dayone). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP-DayOne tool call.

Start from MCP-DayOne, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →