update_personal_info

THE RISK

Medium Risk

Why update_personal_info needs a policy

This tool creates or modifies data reversibly (matches Write category). Severity is high because: (1) it modifies personal information which could include sensitive data like contacts, financial details, or task information; (2) the server explicitly supports encryption, implying sensitive content is stored; (3) unauthorized updates could compromise user privacy or data integrity.

From the tool's definition Tool name 'update_personal_info' combined with description 'Update existing personal information' indicates modification of data.

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

POLICY

How to control update_personal_info

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

policy.json

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

update_personal_info 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 Personal Context 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 Personal Context MCP Server tools

Destructive delete_personal_info Delete specific personal information Execute disable_otp Disable OTP authentication and encryption for personal data. Execute lock_otp Immediately lock the current OTP session and block access to encrypted personal data. Requ Write batch_save_personal_info Save multiple pieces of personal information in a single request. More efficient than maki Read batch_get_personal_info Retrieve multiple categories of personal information in a single request. Retrieve persona Read list_available_personal_info List all available personal information within current permissions Read otp_status Check the current OTP configuration status and whether OTP verification is required. Read verify_otp Verify an OTP token to access encrypted personal data. Required before reading encrypted i

All 9 Personal Context 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 update_personal_info

What does the update_personal_info tool do? +

Update existing personal information. It is categorised as a Write tool in the Personal Context 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 update_personal_info? +

Register the Personal Context MCP Server MCP server in PolicyLayer and add a rule for update_personal_info: 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 Personal Context MCP Server. Nothing to install.

What risk level is update_personal_info? +

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

Can I rate-limit update_personal_info? +

Yes. Add a rate_limit block to the update_personal_info 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_personal_info completely? +

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

update_personal_info is provided by the Personal Context MCP Server MCP server (matipojo/personal-context-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Personal Context MCP Server tool call.

Start from Personal Context 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 →