protocol

mcp_ui_protocol

Optional MCP Apps (io.modelcontextprotocol/ui) metadata for tools and resources. Applications that provide interactive UI resources declare ui in capabilities/1 (and typically resources), implement mcp_resource_protocol for ui:// HTML resources, and may implement these predicates to attach tool and resource UI metadata. See the https://modelcontextprotocol.io/extensions/apps/overview spec for details.

Availability:

logtalk_load(mcp_server(loader))

Author: Paulo Moura

Version: 1:0:0

Date: 2026-08-30

Compilation flags:

static

Dependencies:

(none)

Remarks:

(none)

Inherited public predicates:

(none)

Public predicates

tool_ui/2

Optional. UI metadata for a tool. Options is a list of resource_uri(URI) and/or visibility(List) terms. URI must be a ui:// resource served by the application. List is a list of model and/or app (default when omitted on the wire is both). App-only tools use visibility([app]) so hosts hide them from the model while still allowing iframe-proxied tools/call.

Compilation flags:

static

Template:

tool_ui(ToolName,Options)

Mode and number of proofs:

tool_ui(?atom,-list) - zero_or_more

---

resource_ui_meta/2

Optional. UI metadata for a ui:// resource as a curly-term matching the Apps _meta.ui object (csp, permissions, domain, prefersBorder). Attached when serializing resource descriptors and may be used for resources/read content.

Compilation flags:

static

Template:

resource_ui_meta(URI,Meta)

Mode and number of proofs:

resource_ui_meta(?atom,-compound) - zero_or_more

---

Protected predicates

(none)

Private predicates

(none)

Operators

(none)

See also

mcp_tool_protocol, mcp_resource_protocol, mcp_server