# C++ MCP API Source: https://libtmux.org/en/cxx/latest/mcp/reference/ > Distinguish installed protocol tools from the C++ source consumer's tool-model API. For MCP client requests, use the [tool reference](../tools/). This page covers language APIs for embedding or extending the server. The installed product is `libtmux-mcp-server`. Its public MCP operations are available through the protocol. The C++ tool model lives in a source consumer and is not exported by the installed core package. ## Consumer API `libtmux::mcp::default_tools()` returns an expected value containing a `ToolRegistry` or an error. `tools()` enumerates definitions, `find()` looks up a name, and `call()` invokes a handler against a `Server` with named arguments and an optional `CallContext`. `ToolResult` is an expected value containing structured output or a `ToolError`. `CallContext` provides cooperative cancellation and progress callbacks. `ToolDefinition` describes parameters, output shape, and effect annotations independently of a JSON library. [Consumer declarations](https://github.com/libtmux/libtmux-cxx/blob/393d4b0ad666f18a6581f1eb281741a75a7503f0/apps/mcp/include/libtmux_consumers/mcp.hpp) and [build target](https://github.com/libtmux/libtmux-cxx/blob/393d4b0ad666f18a6581f1eb281741a75a7503f0/apps/mcp/CMakeLists.txt). ## Protocol API The [tool reference](../tools/) covers registered names and schemas. Toolsets and exact names filter the catalog at startup. The static `tmux://capabilities` resource reports that selection. The server has no workflow prompts or dynamic resource templates. Successful tool calls return matching structured content and serialized JSON text. Strict argument validation precedes tmux execution. [Protocol tests](https://github.com/libtmux/libtmux-cxx/blob/393d4b0ad666f18a6581f1eb281741a75a7503f0/apps/mcp/tests/protocol_test.cpp) cover supported lifecycle revisions and result shapes. [Workspace builder API](../../workspace/reference/) documents a separate source consumer; it is not a workspace operation in this MCP catalog. ## API declarations - [libtmux::mcp::ArgumentMap](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-argumentmap/) - [libtmux::mcp::Arguments](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-arguments/) - [libtmux::mcp::ArgumentType](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-argumenttype/) - [libtmux::mcp::CallContext](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-callcontext/) - [libtmux::mcp::configured_tools](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-configured_tools/) - [libtmux::mcp::default_tools](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-default_tools/) - [libtmux::mcp::Effect](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-effect/) - [libtmux::mcp::FlatArguments](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-flatarguments/) - [libtmux::json_wire::from_json](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-json_wire-from_json/) - [libtmux::mcp::Handler](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-handler/) - [libtmux::mcp::InputControl](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-inputcontrol/) - [libtmux::mcp::InputSink](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-inputsink/) - [libtmux::json_wire::is_known_field](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-json_wire-is_known_field/) - [libtmux::mcp::kConservativeAnnotations](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-kconservativeannotations/) - [libtmux::json_wire::kind_from](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-json_wire-kind_from/) - [libtmux::json_wire::kSchemaVersion](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-json_wire-kschemaversion/) - [libtmux::json_wire::name_of](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-json_wire-name_of/) - [libtmux::mcp::NestedAuthority](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-nestedauthority/) - [libtmux::mcp::OutputClass](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-outputclass/) - [libtmux::mcp::OutputShape](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-outputshape/) - [libtmux::mcp::Parameter](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-parameter/) - [libtmux::mcp::parse_tool_selection](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-parse_tool_selection/) - [libtmux::mcp::ProcessReach](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-processreach/) - [libtmux::mcp::ReadToolCall](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-readtoolcall/) - [libtmux::mcp::Sink](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-sink/) - [libtmux::mcp::StructuredValue](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-structuredvalue/) - [libtmux::json_wire::to_json](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-json_wire-to_json/) - [libtmux::mcp::ToolAnnotations](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-toolannotations/) - [libtmux::mcp::ToolAuthority](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-toolauthority/) - [libtmux::mcp::ToolDefinition](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-tooldefinition/) - [libtmux::mcp::ToolError](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-toolerror/) - [libtmux::mcp::ToolOutput](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-tooloutput/) - [libtmux::mcp::ToolRegistry](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-toolregistry/) - [libtmux::mcp::ToolResult](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-toolresult/) - [libtmux::mcp::ToolSchema](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-toolschema/) - [libtmux::mcp::ToolSelection](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-toolselection/) - [libtmux::mcp::Toolset](https://libtmux.org/en/cxx/latest/mcp/reference/libtmux-mcp-toolset/) [Protocol catalog](https://libtmux.org/en/cxx/latest/mcp/tools.json)