acf_update_post_field

Update a single ACF field value for a post (updated is false when the value did not change)

SERVERWordpress SOURCE@cavort-it-systems/wordpress-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-cvrt-jh-wordpress-mcp/acf-update-post-field.md

WHAT IT DOES

What acf_update_post_field does on Wordpress

AI agents use acf_update_post_field to create or update resources in Wordpress, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Wordpress environment.

RISK

Why acf_update_post_field is rated Medium

Modifies post metadata reversibly; changes can be undone or overwritten without data loss.

From the tool's definition Update a single ACF field value for a post

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs acf_update_post_field safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Wordpress, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For acf_update_post_field, this is the rule to start with:

acf_update_post_field Rate-limited

acf_update_post_field 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.

View as policy code

policy.json

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

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Wordpress, apply this rule, and every acf_update_post_field call is checked against it from then on.

FAQ

Questions about acf_update_post_field

What does the acf_update_post_field tool do? +

Update a single ACF field value for a post (updated is false when the value did not change). It is categorised as a Write tool in the Wordpress MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on acf_update_post_field? +

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

What risk level is acf_update_post_field? +

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

Can I rate-limit acf_update_post_field? +

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

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

acf_update_post_field is provided by the Wordpress MCP server (@cavort-it-systems/wordpress-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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