Read and write Meta Box custom-field values and discover field groups over MCP.
Meta Box is the developer's custom-fields toolkit, fast, code-first, and popular for building content models on client sites. EMCP exposes it through two dispatcher tools: read Meta Box field groups and field values on a post or any object type, and update field values.
It's intentionally conservative, values only. There's no field authoring and no delete, and unknown fields are skipped rather than created, so an AI can safely fill in and update structured content without risk of scrambling your field definitions. Reads are on by default; the write tool is opt-in. A community contribution, and free.
Once Meta Box is active, ask any MCP client, Claude, Cursor, or your own, to do these in plain language.
Real instructions you can hand your agent for Meta Box.
"Read all Meta Box fields on this post and show me their current values."
"Set the 'price' and 'availability' custom fields on product 88."
"What field groups does Meta Box define for the 'event' post type?"
Read a post's Meta Box fields, how EMCP drives Meta Box.
metabox-read({ operation: "get-fields", arguments: { post_id: 123 } })Note: Only registers when Meta Box is active. Free EMCP integration; metabox-write ships off.
No, this integration is values only. It reads field groups and reads/writes field values, but it does not author fields or delete anything, and unknown fields are skipped rather than created.
Yes. metabox-read and metabox-write ship in the free EMCP plugin. metabox-read is on by default; metabox-write ships off.
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