capacities_save_to_daily_note

THE RISK

Medium Risk

Why capacities_save_to_daily_note needs a policy

This tool creates or modifies data in a reversible manner by appending text to a daily note. It is Write-category because the action modifies existing data (the daily note) without destroying it, and the modification can theoretically be undone.

From the tool's definition Tool name contains 'save_to' and description says 'Add markdown text to today' [daily note]. The verb 'Add' indicates creation/modification of data (the daily note content).

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

POLICY

How to control capacities_save_to_daily_note

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

policy.json

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

capacities_save_to_daily_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 Capacities MCP Server — 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

More Capacities MCP Server tools

Write capacities_save_weblink Save a web link to a Capacities space with optional title and tags Read capacities_get_space_info Get information about a Capacities space Read capacities_list_spaces Get a list of all personal spaces in Capacities Read capacities_read_object_content Retrieve the full content of a Capacities object by its ID. Optionally provide a title or Read capacities_search Search for content across Capacities spaces with optional filtering

All 6 Capacities MCP Server 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 capacities_save_to_daily_note

What does the capacities_save_to_daily_note tool do? +

Add markdown text to today. It is categorised as a Write tool in the Capacities 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 capacities_save_to_daily_note? +

Register the Capacities MCP Server MCP server in PolicyLayer and add a rule for capacities_save_to_daily_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 Capacities MCP Server. Nothing to install.

What risk level is capacities_save_to_daily_note? +

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

Can I rate-limit capacities_save_to_daily_note? +

Yes. Add a rate_limit block to the capacities_save_to_daily_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 capacities_save_to_daily_note completely? +

Set action: deny in the PolicyLayer policy for capacities_save_to_daily_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 capacities_save_to_daily_note? +

capacities_save_to_daily_note is provided by the Capacities MCP Server MCP server (jem-computer/capacities-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Capacities MCP Server tool call.

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

CHECK YOUR STACK →