diff --git a/include/aster_api.h b/include/aster_api.h
index 71e227e..46b1d1a 100644
--- a/include/aster_api.h
+++ b/include/aster_api.h
@@ -15,21 +15,120 @@
 #define ASTER_API_H
 
 #include "types.h"
+#include "storage.h"
 
-#define ASTER_APP_API_VERSION 1
+#define ASTER_APP_API_VERSION 2
+
+#define ASTER_API_CAP_CONSOLE  (1U << 0)
+#define ASTER_API_CAP_TIME     (1U << 1)
+#define ASTER_API_CAP_MEMORY   (1U << 2)
+#define ASTER_API_CAP_INPUT    (1U << 3)
+#define ASTER_API_CAP_STORAGE  (1U << 4)
+#define ASTER_API_CAP_PROCESS  (1U << 5)
+
+#define ASTER_API_OK                0
+#define ASTER_API_ERR_INVALID      -1
+#define ASTER_API_ERR_NOT_FOUND    -2
+#define ASTER_API_ERR_NO_SPACE     -3
+#define ASTER_API_ERR_ALREADY      -4
+
+typedef struct {
+    usize total_pages;
+    usize free_pages;
+    usize used_pages;
+} aster_api_memory_info_t;
+
+typedef struct {
+    u32 pid;
+    u8 state;
+    u8 priority;
+    const char *name;
+} aster_api_process_info_t;
+
+typedef struct {
+    char name[ASTERFS_NAME_LEN];
+    u8 is_dir;
+    u16 size;
+} aster_api_dirent_t;
+
+typedef void (*aster_api_dirent_cb)(const aster_api_dirent_t *entry, void *user);
 
 typedef struct {
     u32 api_version;
-    u32 reserved;
+    u32 capabilities;
+    u64 boot_ticks;
 } aster_app_context_t;
 
+/*
+ * Inicializuje kontext aplikace a vyplni verzi API, capability masku
+ * a aktualni hodnotu boot tiku. Vraci ASTER_API_OK nebo chybu.
+ */
+int aster_api_context_init(aster_app_context_t *ctx);
+
+/*
+ * Konzolove API pro vypis textu, cisteni obrazovky a praci s kurzorem.
+ */
 int aster_api_print(const char *text);
+int aster_api_print_line(const char *text);
 int aster_api_clear(void);
+int aster_api_set_color(u8 fg, u8 bg);
+int aster_api_get_cursor(usize *out_row, usize *out_col);
+int aster_api_set_cursor(usize row, usize col);
+
+/*
+ * Casove API. Tick je globalni casovac jadra od bootu.
+ */
 int aster_api_ticks(u64 *out_ticks);
+u64 aster_api_ticks_now(void);
+int aster_api_sleep_ms(u32 ms);
+
+/*
+ * Pametove API a jednoduche utility nad pameti bez zavislosti na libc.
+ */
 void *aster_api_alloc(usize size);
+void aster_api_memset(void *dst, u8 value, usize size);
+void aster_api_memcpy(void *dst, const void *src, usize size);
+int aster_api_memory_info(aster_api_memory_info_t *out_info);
+
+/*
+ * Vstupni API pro klavesnici.
+ * read_key blokuje, try_read_key je neblokujici, read_line cte cely radek.
+ */
+int aster_api_read_key(void);
+int aster_api_try_read_key(void);
+int aster_api_read_line(char *buffer, int max_len);
+
+/*
+ * AsterFS API pokryvajici bezne operace nad soubory a adresari.
+ * Textove helpery zajistuji nulovy terminator pri cteni textu.
+ */
 int aster_api_file_create(const char *path);
+int aster_api_dir_create(const char *path);
+int aster_api_file_remove(const char *path);
+int aster_api_dir_remove(const char *path);
+int aster_api_path_exists(const char *path);
+int aster_api_file_exists(const char *path);
+int aster_api_dir_exists(const char *path);
 int aster_api_file_read(const char *path, u8 *out, u16 max_len);
 int aster_api_file_write(const char *path, const u8 *data, u16 len);
+int aster_api_file_read_text(const char *path, char *out, u16 max_len);
+int aster_api_file_write_text(const char *path, const char *text);
+int aster_api_list_dir(const char *path, aster_api_dirent_cb cb, void *user);
+
+/*
+ * Procesove API pro spawn, introspekci tabulky procesu a voluntary yield.
+ */
 int aster_api_process_spawn(void (*entry)(void), const char *name, u8 priority);
+int aster_api_process_count(usize *out_count);
+int aster_api_process_current(aster_api_process_info_t *out_info);
+int aster_api_process_get(usize index, aster_api_process_info_t *out_info);
+int aster_api_yield(void);
+
+/*
+ * String utility API urcene pro aplikace bez standardni knihovny C.
+ */
+usize aster_api_str_len(const char *text);
+int aster_api_str_equal(const char *a, const char *b);
+int aster_api_str_starts_with(const char *text, const char *prefix);
 
 #endif
diff --git a/include/syscall.h b/include/syscall.h
index 737cca1..70960c9 100644
--- a/include/syscall.h
+++ b/include/syscall.h
@@ -19,6 +19,21 @@
 #define SYSCALL_WRITE          0
 #define SYSCALL_ALLOC          1
 #define SYSCALL_PROCESS_CREATE 2
+#define SYSCALL_CLEAR          3
+#define SYSCALL_TICKS          4
+#define SYSCALL_SLEEP_MS       5
+#define SYSCALL_READ_KEY       6
+#define SYSCALL_TRY_READ_KEY   7
+#define SYSCALL_READ_LINE      8
+#define SYSCALL_FS_CREATE_FILE 9
+#define SYSCALL_FS_READ_FILE   10
+#define SYSCALL_FS_WRITE_FILE  11
+#define SYSCALL_FS_CREATE_DIR  12
+#define SYSCALL_FS_REMOVE_FILE 13
+#define SYSCALL_FS_REMOVE_DIR  14
+#define SYSCALL_PROCESS_COUNT  15
+#define SYSCALL_PROCESS_CURPID 16
+#define SYSCALL_YIELD          17
 
 void syscall_init(void);
 u64 syscall_dispatch(u64 id, u64 a1, u64 a2, u64 a3, u64 a4);
@@ -26,5 +41,20 @@ u64 syscall_dispatch(u64 id, u64 a1, u64 a2, u64 a3, u64 a4);
 u64 aster_write(const char *text);
 void *aster_alloc(usize size);
 i64 aster_process_create(void (*entry)(void), const char *name, u8 priority);
+u64 aster_clear(void);
+u64 aster_ticks(void);
+u64 aster_sleep_ms(u64 ms);
+i64 aster_read_key(void);
+i64 aster_try_read_key(void);
+i64 aster_read_line(char *buffer, i64 max_len);
+i64 asterfs_create_file_sys(const char *path);
+i64 asterfs_read_file_sys(const char *path, u8 *out, u16 max_len);
+i64 asterfs_write_file_sys(const char *path, const u8 *data, u16 len);
+i64 asterfs_create_dir_sys(const char *path);
+i64 asterfs_remove_file_sys(const char *path);
+i64 asterfs_remove_dir_sys(const char *path);
+i64 aster_process_count_sys(void);
+i64 aster_process_current_pid(void);
+u64 aster_yield(void);
 
 #endif
diff --git a/kernel/aster_api.c b/kernel/aster_api.c
index 725c489..698afd2 100644
--- a/kernel/aster_api.c
+++ b/kernel/aster_api.c
@@ -12,37 +12,182 @@
  */
 
 #include "aster_api.h"
+#include "drivers.h"
 #include "display.h"
+#include "memory.h"
+#include "process.h"
+#include "scheduler.h"
 #include "storage.h"
+#include "string.h"
 #include "syscall.h"
 #include "timer.h"
 
+static aster_api_dirent_cb g_list_cb = 0;
+static void *g_list_user = 0;
+
+static void aster_api_list_bridge(const char *name, u8 is_dir, u16 size) {
+    aster_api_dirent_t entry;
+    usize len = 0;
+
+    if (!g_list_cb || !name) {
+        return;
+    }
+
+    aster_memset(&entry, 0, sizeof(entry));
+    while (name[len] && len + 1 < ASTERFS_NAME_LEN) {
+        entry.name[len] = name[len];
+        ++len;
+    }
+    entry.name[len] = '\0';
+    entry.is_dir = is_dir;
+    entry.size = size;
+    g_list_cb(&entry, g_list_user);
+}
+
+int aster_api_context_init(aster_app_context_t *ctx) {
+    if (!ctx) {
+        return ASTER_API_ERR_INVALID;
+    }
+
+    ctx->api_version = ASTER_APP_API_VERSION;
+    ctx->capabilities = ASTER_API_CAP_CONSOLE |
+                        ASTER_API_CAP_TIME |
+                        ASTER_API_CAP_MEMORY |
+                        ASTER_API_CAP_INPUT |
+                        ASTER_API_CAP_STORAGE |
+                        ASTER_API_CAP_PROCESS;
+    ctx->boot_ticks = (u64)timer_ticks();
+    return ASTER_API_OK;
+}
+
 int aster_api_print(const char *text) {
     return (int)aster_write(text);
 }
 
+int aster_api_print_line(const char *text) {
+    int rc;
+
+    rc = aster_api_print(text ? text : "");
+    if (rc != 0) {
+        return rc;
+    }
+
+    return aster_api_print("\n");
+}
+
 int aster_api_clear(void) {
-    display_clear();
-    return 0;
+    return (int)aster_clear();
+}
+
+int aster_api_set_color(u8 fg, u8 bg) {
+    display_set_color(fg, bg);
+    return ASTER_API_OK;
+}
+
+int aster_api_get_cursor(usize *out_row, usize *out_col) {
+    if (!out_row && !out_col) {
+        return ASTER_API_ERR_INVALID;
+    }
+
+    display_get_cursor(out_row, out_col);
+    return ASTER_API_OK;
+}
+
+int aster_api_set_cursor(usize row, usize col) {
+    display_set_cursor(row, col);
+    return ASTER_API_OK;
 }
 
 int aster_api_ticks(u64 *out_ticks) {
     if (!out_ticks) {
-        return -1;
+        return ASTER_API_ERR_INVALID;
     }
 
-    *out_ticks = (u64)timer_ticks();
-    return 0;
+    *out_ticks = aster_api_ticks_now();
+    return ASTER_API_OK;
+}
+
+u64 aster_api_ticks_now(void) {
+    return aster_ticks();
+}
+
+int aster_api_sleep_ms(u32 ms) {
+    return (int)aster_sleep_ms((u64)ms);
 }
 
 void *aster_api_alloc(usize size) {
     return aster_alloc(size);
 }
 
+void aster_api_memset(void *dst, u8 value, usize size) {
+    if (!dst || size == 0) {
+        return;
+    }
+
+    aster_memset(dst, (int)value, size);
+}
+
+void aster_api_memcpy(void *dst, const void *src, usize size) {
+    if (!dst || !src || size == 0) {
+        return;
+    }
+
+    aster_memcpy(dst, src, size);
+}
+
+int aster_api_memory_info(aster_api_memory_info_t *out_info) {
+    if (!out_info) {
+        return ASTER_API_ERR_INVALID;
+    }
+
+    out_info->total_pages = memory_total_pages();
+    out_info->free_pages = memory_free_pages();
+    out_info->used_pages = out_info->total_pages >= out_info->free_pages
+                               ? out_info->total_pages - out_info->free_pages
+                               : 0;
+    return ASTER_API_OK;
+}
+
+int aster_api_read_key(void) {
+    return (int)aster_read_key();
+}
+
+int aster_api_try_read_key(void) {
+    return (int)aster_try_read_key();
+}
+
+int aster_api_read_line(char *buffer, int max_len) {
+    return (int)aster_read_line(buffer, (i64)max_len);
+}
+
 int aster_api_file_create(const char *path) {
     return asterfs_create_file(path);
 }
 
+int aster_api_dir_create(const char *path) {
+    return asterfs_create_dir(path);
+}
+
+int aster_api_file_remove(const char *path) {
+    return asterfs_remove_file(path);
+}
+
+int aster_api_dir_remove(const char *path) {
+    return asterfs_remove_dir(path);
+}
+
+int aster_api_path_exists(const char *path) {
+    return asterfs_get_type(path) >= 0 ? 1 : 0;
+}
+
+int aster_api_file_exists(const char *path) {
+    return asterfs_get_type(path) == 0 ? 1 : 0;
+}
+
+int aster_api_dir_exists(const char *path) {
+    return asterfs_get_type(path) == 1 ? 1 : 0;
+}
+
 int aster_api_file_read(const char *path, u8 *out, u16 max_len) {
     return asterfs_read_file(path, out, max_len);
 }
@@ -51,6 +196,128 @@ int aster_api_file_write(const char *path, const u8 *data, u16 len) {
     return asterfs_write_file(path, data, len);
 }
 
+int aster_api_file_read_text(const char *path, char *out, u16 max_len) {
+    int n;
+
+    if (!out || max_len == 0) {
+        return ASTER_API_ERR_INVALID;
+    }
+
+    n = aster_api_file_read(path, (u8 *)out, (u16)(max_len - 1));
+    if (n < 0) {
+        out[0] = '\0';
+        return n;
+    }
+
+    out[n] = '\0';
+    return n;
+}
+
+int aster_api_file_write_text(const char *path, const char *text) {
+    usize len;
+
+    if (!text) {
+        return ASTER_API_ERR_INVALID;
+    }
+
+    len = aster_strlen(text);
+    if (len > 0xFFFFUL) {
+        len = 0xFFFFUL;
+    }
+
+    return aster_api_file_write(path, (const u8 *)text, (u16)len);
+}
+
+int aster_api_list_dir(const char *path, aster_api_dirent_cb cb, void *user) {
+    if (!path || !cb) {
+        return ASTER_API_ERR_INVALID;
+    }
+
+    g_list_cb = cb;
+    g_list_user = user;
+    asterfs_list_dir(path, aster_api_list_bridge);
+    g_list_cb = 0;
+    g_list_user = 0;
+    return ASTER_API_OK;
+}
+
 int aster_api_process_spawn(void (*entry)(void), const char *name, u8 priority) {
     return (int)aster_process_create(entry, name, priority);
 }
+
+int aster_api_process_count(usize *out_count) {
+    if (!out_count) {
+        return ASTER_API_ERR_INVALID;
+    }
+
+    *out_count = process_count();
+    return ASTER_API_OK;
+}
+
+int aster_api_process_current(aster_api_process_info_t *out_info) {
+    process_t *p;
+
+    if (!out_info) {
+        return ASTER_API_ERR_INVALID;
+    }
+
+    p = process_current();
+    if (!p) {
+        return ASTER_API_ERR_NOT_FOUND;
+    }
+
+    out_info->pid = p->pid;
+    out_info->state = (u8)p->state;
+    out_info->priority = p->priority;
+    out_info->name = p->name;
+    return ASTER_API_OK;
+}
+
+int aster_api_process_get(usize index, aster_api_process_info_t *out_info) {
+    process_t *table;
+    usize count;
+
+    if (!out_info) {
+        return ASTER_API_ERR_INVALID;
+    }
+
+    count = process_count();
+    if (index >= count) {
+        return ASTER_API_ERR_NOT_FOUND;
+    }
+
+    table = process_table();
+    out_info->pid = table[index].pid;
+    out_info->state = (u8)table[index].state;
+    out_info->priority = table[index].priority;
+    out_info->name = table[index].name;
+    return ASTER_API_OK;
+}
+
+int aster_api_yield(void) {
+    scheduler_yield();
+    return ASTER_API_OK;
+}
+
+usize aster_api_str_len(const char *text) {
+    return aster_strlen(text);
+}
+
+int aster_api_str_equal(const char *a, const char *b) {
+    if (!a || !b) {
+        return 0;
+    }
+
+    return aster_strcmp(a, b) == 0 ? 1 : 0;
+}
+
+int aster_api_str_starts_with(const char *text, const char *prefix) {
+    usize n;
+
+    if (!text || !prefix) {
+        return 0;
+    }
+
+    n = aster_strlen(prefix);
+    return aster_strncmp(text, prefix, n) == 0 ? 1 : 0;
+}
diff --git a/kernel/syscall.c b/kernel/syscall.c
index 07ec272..cb38303 100644
--- a/kernel/syscall.c
+++ b/kernel/syscall.c
@@ -11,9 +11,14 @@
  * a implementuje zakladni syscall operace pro zapis, alokaci a procesy.
  */
 
+#include "display.h"
+#include "drivers.h"
 #include "memory.h"
 #include "printk.h"
 #include "process.h"
+#include "scheduler.h"
+#include "storage.h"
+#include "timer.h"
 #include "syscall.h"
 
 void syscall_init(void) {
@@ -30,6 +35,36 @@ u64 syscall_dispatch(u64 id, u64 a1, u64 a2, u64 a3, u64 a4) {
             return (u64)aster_alloc((usize)a1);
         case SYSCALL_PROCESS_CREATE:
             return (u64)aster_process_create((void (*)(void))a1, (const char *)a2, (u8)a3);
+        case SYSCALL_CLEAR:
+            return aster_clear();
+        case SYSCALL_TICKS:
+            return aster_ticks();
+        case SYSCALL_SLEEP_MS:
+            return aster_sleep_ms(a1);
+        case SYSCALL_READ_KEY:
+            return (u64)aster_read_key();
+        case SYSCALL_TRY_READ_KEY:
+            return (u64)aster_try_read_key();
+        case SYSCALL_READ_LINE:
+            return (u64)aster_read_line((char *)a1, (i64)a2);
+        case SYSCALL_FS_CREATE_FILE:
+            return (u64)asterfs_create_file_sys((const char *)a1);
+        case SYSCALL_FS_READ_FILE:
+            return (u64)asterfs_read_file_sys((const char *)a1, (u8 *)a2, (u16)a3);
+        case SYSCALL_FS_WRITE_FILE:
+            return (u64)asterfs_write_file_sys((const char *)a1, (const u8 *)a2, (u16)a3);
+        case SYSCALL_FS_CREATE_DIR:
+            return (u64)asterfs_create_dir_sys((const char *)a1);
+        case SYSCALL_FS_REMOVE_FILE:
+            return (u64)asterfs_remove_file_sys((const char *)a1);
+        case SYSCALL_FS_REMOVE_DIR:
+            return (u64)asterfs_remove_dir_sys((const char *)a1);
+        case SYSCALL_PROCESS_COUNT:
+            return (u64)aster_process_count_sys();
+        case SYSCALL_PROCESS_CURPID:
+            return (u64)aster_process_current_pid();
+        case SYSCALL_YIELD:
+            return aster_yield();
         default:
             return (u64)-1;
     }
@@ -56,3 +91,76 @@ i64 aster_process_create(void (*entry)(void), const char *name, u8 priority) {
 
     return p->pid;
 }
+
+u64 aster_clear(void) {
+    display_clear();
+    return 0;
+}
+
+u64 aster_ticks(void) {
+    return (u64)timer_ticks();
+}
+
+u64 aster_sleep_ms(u64 ms) {
+    timer_sleep_ms((unsigned long)ms);
+    return 0;
+}
+
+i64 aster_read_key(void) {
+    return (i64)keyboard_read_key();
+}
+
+i64 aster_try_read_key(void) {
+    return (i64)keyboard_try_read_key();
+}
+
+i64 aster_read_line(char *buffer, i64 max_len) {
+    if (!buffer || max_len <= 0) {
+        return -1;
+    }
+
+    return (i64)keyboard_readline(buffer, (int)max_len);
+}
+
+i64 asterfs_create_file_sys(const char *path) {
+    return (i64)asterfs_create_file(path);
+}
+
+i64 asterfs_read_file_sys(const char *path, u8 *out, u16 max_len) {
+    return (i64)asterfs_read_file(path, out, max_len);
+}
+
+i64 asterfs_write_file_sys(const char *path, const u8 *data, u16 len) {
+    return (i64)asterfs_write_file(path, data, len);
+}
+
+i64 asterfs_create_dir_sys(const char *path) {
+    return (i64)asterfs_create_dir(path);
+}
+
+i64 asterfs_remove_file_sys(const char *path) {
+    return (i64)asterfs_remove_file(path);
+}
+
+i64 asterfs_remove_dir_sys(const char *path) {
+    return (i64)asterfs_remove_dir(path);
+}
+
+i64 aster_process_count_sys(void) {
+    return (i64)process_count();
+}
+
+i64 aster_process_current_pid(void) {
+    process_t *p = process_current();
+
+    if (!p) {
+        return -1;
+    }
+
+    return (i64)p->pid;
+}
+
+u64 aster_yield(void) {
+    scheduler_yield();
+    return 0;
+}