8 files changed, 142 insertions, 0 deletions
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
new file mode 100644
index 0000000..ef54a08
--- /dev/null
+++ b/src/CMakeLists.txt
@@ -0,0 +1,14 @@
+add_executable(tiny-convmem-mcp
+  app/main.c
+  mcp/server.c
+  mcp/tools/health.c
+)
+
+target_include_directories(tiny-convmem-mcp PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}")
+target_link_libraries(tiny-convmem-mcp PRIVATE mcpc::mcpc)
+target_compile_features(tiny-convmem-mcp PRIVATE c_std_17)
+
+if(MSVC)
+  target_compile_options(tiny-convmem-mcp PRIVATE /utf-8 /W4)
+endif()
+
diff --git a/src/app/main.c b/src/app/main.c
new file mode 100644
index 0000000..ab8688f
--- /dev/null
+++ b/src/app/main.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+#include "mcp/server.h"
+
+int
+main(void)
+{
+  const int result = tiny_convmem_server_run(stdin, stdout);
+  if (result != 0)
+    {
+      fprintf(stderr, "tiny-convmem-mcp stopped with error code %d\n", result);
+    }
+  return result;
+}
+
diff --git a/src/domain/README.md b/src/domain/README.md
new file mode 100644
index 0000000..0d359af
--- /dev/null
+++ b/src/domain/README.md
@@ -0,0 +1,8 @@
+# Domain layer
+
+This directory is reserved for the conversation-memory domain model and its
+business rules. Conversation, message, retention, and search contracts will be
+defined here only after the next design phase.
+
+The domain layer must not depend on mcpc or on a concrete storage engine.
+
diff --git a/src/mcp/server.c b/src/mcp/server.c
new file mode 100644
index 0000000..57d197d
--- /dev/null
+++ b/src/mcp/server.c
@@ -0,0 +1,52 @@
+#include "mcp/server.h"
+
+#include <mcpc/mcpc.h>
+#include "mcp/tools/health.h"
+
+int
+tiny_convmem_server_run(FILE *input, FILE *output)
+{
+  mcpc_server_t *server = mcpc_server_new_iostrm(input, output);
+  if (server == NULL)
+    {
+      return MCPC_EC_BUG;
+    }
+
+  mcpc_errcode_t result = mcpc_server_set_nament(
+    server,
+    (const char8_t *)"tiny-convmem-mcp"
+  );
+  if (result == MCPC_EC_0)
+    {
+      result = mcpc_server_capa_enable_tool(server);
+    }
+
+  mcpc_tool_t *health = NULL;
+  if (result == MCPC_EC_0)
+    {
+      health = tiny_convmem_health_tool_create();
+      if (health == NULL)
+        {
+          result = MCPC_EC_BUG;
+        }
+    }
+
+  if (result == MCPC_EC_0)
+    {
+      result = mcpc_server_add_tool(server, health);
+    }
+  if (result == MCPC_EC_0)
+    {
+      result = mcpc_server_start(server);
+    }
+
+  {
+    const mcpc_errcode_t close_result = mcpc_server_close(server);
+    if (result == MCPC_EC_0)
+      {
+        result = close_result;
+      }
+  }
+
+  return (int)result;
+}
diff --git a/src/mcp/server.h b/src/mcp/server.h
new file mode 100644
index 0000000..e3ff2c4
--- /dev/null
+++ b/src/mcp/server.h
@@ -0,0 +1,9 @@
+#ifndef TINY_CONVMEM_MCP_SERVER_H
+#define TINY_CONVMEM_MCP_SERVER_H
+
+#include <stdio.h>
+
+int tiny_convmem_server_run(FILE *input, FILE *output);
+
+#endif
+
diff --git a/src/mcp/tools/health.c b/src/mcp/tools/health.c
new file mode 100644
index 0000000..0309ea5
--- /dev/null
+++ b/src/mcp/tools/health.c
@@ -0,0 +1,29 @@
+#include "mcp/tools/health.h"
+
+#include <mcpc/ucbr.h>
+
+static void
+health_call(const mcpc_tool_t *tool, mcpc_ucbr_t *result)
+{
+  (void)tool;
+  mcpc_ucbr_toolcall_add_text_printf8(result, (const char8_t *)"ok");
+}
+
+mcpc_tool_t *
+tiny_convmem_health_tool_create(void)
+{
+  mcpc_tool_t *tool = mcpc_tool_new2(
+    (const char8_t *)"health",
+    (const char8_t *)"Check whether the tiny conversation memory server is running"
+  );
+  if (tool == NULL)
+    {
+      return NULL;
+    }
+
+  if (mcpc_tool_set_call_cb(tool, health_call) != MCPC_EC_0)
+    {
+      return NULL;
+    }
+  return tool;
+}
diff --git a/src/mcp/tools/health.h b/src/mcp/tools/health.h
new file mode 100644
index 0000000..f4bfe0a
--- /dev/null
+++ b/src/mcp/tools/health.h
@@ -0,0 +1,9 @@
+#ifndef TINY_CONVMEM_MCP_HEALTH_H
+#define TINY_CONVMEM_MCP_HEALTH_H
+
+#include <mcpc/tool.h>
+
+mcpc_tool_t *tiny_convmem_health_tool_create(void);
+
+#endif
+
diff --git a/src/storage/README.md b/src/storage/README.md
new file mode 100644
index 0000000..ceb8965
--- /dev/null
+++ b/src/storage/README.md
@@ -0,0 +1,6 @@
+# Storage layer
+
+This directory is reserved for persistence adapters. The storage engine and its
+schema are intentionally undecided; SQLite or another dependency will be added
+to `vcpkg.json` only after the storage contract is designed.
+