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docs/snippets/c/mcp/mcp_custom_client.md

@@ -0,0 +1,56 @@
+```c title="C"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+/* The kreuzberg C FFI does not bundle an MCP client. Drive the kreuzberg
+ * CLI's stdio MCP transport from a C host that also links libkreuzberg. */
+int main(void) {
+    int request_pipe[2];
+    int response_pipe[2];
+    if (pipe(request_pipe) < 0 || pipe(response_pipe) < 0) {
+        perror("pipe");
+        return 1;
+    }
+
+    pid_t pid = fork();
+    if (pid < 0) {
+        perror("fork");
+        return 1;
+    }
+    if (pid == 0) {
+        dup2(request_pipe[0], 0);
+        dup2(response_pipe[1], 1);
+        close(request_pipe[1]);
+        close(response_pipe[0]);
+        execlp("kreuzberg", "kreuzberg", "mcp", (char *)NULL);
+        perror("execlp");
+        _exit(127);
+    }
+
+    close(request_pipe[0]);
+    close(response_pipe[1]);
+
+    const char *request =
+        "{\"method\":\"tools/call\","
+        "\"params\":{\"name\":\"extract_file\","
+        "\"arguments\":{\"path\":\"document.pdf\",\"async\":true}}}\n";
+    if (write(request_pipe[1], request, strlen(request)) < 0) {
+        perror("write");
+        return 1;
+    }
+    close(request_pipe[1]);
+
+    char buffer[4096];
+    ssize_t bytes_read = read(response_pipe[0], buffer, sizeof(buffer) - 1);
+    if (bytes_read > 0) {
+        buffer[bytes_read] = '\0';
+        printf("%s", buffer);
+    }
+    close(response_pipe[0]);
+    return 0;
+}
+```
+
+<!-- snippet:syntax-only --> No MCP client is exposed by libkreuzberg; this snippet drives the MCP CLI over stdio.