list_journals_from_db

THE RISK

Low Risk

Why list_journals_from_db needs a policy

This tool queries and returns journal metadata (names and entry counts) from the database. It performs no creation, modification, deletion, or execution of code/commands. The blast radius of misuse is minimal — an agent could learn journal names and entry counts, but cannot alter data or trigger external actions.

From the tool's definition Tool name contains 'list' and description states 'List all journals from database' — core read operation that retrieves data without modification or side effects.

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

POLICY

How to control list_journals_from_db

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 list_journals_from_db:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_journals_from_db": {}
  }
}

list_journals_from_db is read-only, so it stays allowed — but 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.

CAP THIS TOOL →

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EXPLORE

Related tools and policies

More MCP-DayOne tools

Write create_entry_with_attachments Create a journal entry with file attachments (photos, videos, audio, PDFs) 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 read_recent_entries Read recent journal entries from Day One database

All 10 MCP-DayOne tools →

Read 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.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_journals_from_db

What does the list_journals_from_db tool do? +

List all journals from database with entry counts. It is categorised as a Read tool in the MCP-DayOne MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_journals_from_db? +

Register the MCP-DayOne MCP server in PolicyLayer and add a rule for list_journals_from_db: 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 list_journals_from_db? +

list_journals_from_db is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_journals_from_db? +

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

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

list_journals_from_db 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 →