.. index:: single: mcp_completion_protocol
.. _mcp_completion_protocol/0:

.. rst-class:: right

**protocol**

``mcp_completion_protocol``
===========================

Protocol for Logtalk objects that provide MCP prompt argument and resource URI completions. Used by the 2025-06-18, 2025-11-25, and 2026-07-28 adapters.

| **Availability:** 
|    ``logtalk_load(mcp_server(loader))``

| **Author:** Paulo Moura
| **Version:** 1:0:0
| **Date:** 2026-09-02

| **Compilation flags:**
|    ``static``


| **Dependencies:**
|   (none)


| **Remarks:**

   - Capabilities: Objects providing completions must declare ``completions`` in their ``capabilities/1`` predicate (from the ``mcp_tool_protocol`` protocol).
   - References: The reference is either ``prompt(Name)`` for a declared prompt or ``resource(URI)`` for a declared resource URI or URI template.
   - Results: The result is ``completion(Values)`` or ``completion(Values, Total, HasMore)``. ``Values`` is an application-ranked list of atoms. The server preserves the first 100 values and sets ``hasMore`` to true when truncation is required. ``Total`` is a non-negative integer and ``HasMore`` is ``true`` or ``false``.

| **Inherited public predicates:**
|    (none)

.. contents::
   :local:
   :backlinks: top

Public predicates
-----------------

.. index:: completion/4
.. _mcp_completion_protocol/0::completion/4:

``completion/4``
^^^^^^^^^^^^^^^^

Returns completion suggestions for a prompt argument or resource URI. ``Reference`` is ``prompt(Name)`` or ``resource(URI)``, ``Argument`` is an ``ArgumentName-PartialValue`` pair, ``Context`` is a list of previously resolved ``Name-Value`` argument pairs, and ``Result`` is ``completion(Values)`` or ``completion(Values, Total, HasMore)``.

| **Compilation flags:**
|    ``static``

| **Template:**
|    ``completion(Reference,Argument,Context,Result)``
| **Mode and number of proofs:**
|    ``completion(+compound,+pair,+list(pair),--compound)`` - ``one``


------------

Protected predicates
--------------------

(none)

Private predicates
------------------

(none)

Operators
---------

(none)