update_todays_note

THE RISK

Medium Risk

Why update_todays_note needs a policy

This tool modifies existing data (today's note content) but does not delete it irreversibly or execute arbitrary code. Update operations are Write-category. Severity is medium because an AI agent could inadvertently overwrite important personal notes, but the damage is limited to one day's content and potentially recoverable via GitHub's version history.

From the tool's definition Tool name is 'update_todays_note' and description states 'Update the existing content of today' — the verb 'update' indicates modification of existing data (a daily note).

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

POLICY

How to control update_todays_note

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

policy.json

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

update_todays_note 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 GistPad MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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Destructive delete_daily_note Delete a specific daily note by date Destructive delete_gist Delete a GitHub Gist by ID Destructive delete_gist_comment Delete a comment from a gist Destructive delete_gist_file Delete a file from a gist Destructive delete_gist_prompt Delete a prompt from your gist-based prompts collection Write add_gist_comment Add a comment to a gist Write add_gist_file Add a new file to a gist Write add_gist_prompt Add a new prompt to your gist-based prompts collection

All 23 GistPad MCP 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 update_todays_note

What does the update_todays_note tool do? +

Update the existing content of today. It is categorised as a Write tool in the GistPad MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_todays_note? +

Register the GistPad MCP server in PolicyLayer and add a rule for update_todays_note: 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 GistPad MCP. Nothing to install.

What risk level is update_todays_note? +

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

Can I rate-limit update_todays_note? +

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

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

update_todays_note is provided by the GistPad MCP server (lostintangent/gistpad-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every GistPad MCP tool call.

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

CHECK YOUR STACK →