diff --git a/.gitignore b/.gitignore
index 3ce762e..32ef871 100644
--- a/.gitignore
+++ b/.gitignore
@@ -33,3 +33,6 @@ dream.md
 
 # Agent process reports — local-only shared memory (not tracked)
 AgentsReport/
+
+# Task breakdown notes — never committed
+.tasks/
diff --git a/DOC/AGENT_Context_Project.md b/DOC/AGENT_Context_Project.md
index 2d3d3ed..5a55347 100644
--- a/DOC/AGENT_Context_Project.md
+++ b/DOC/AGENT_Context_Project.md
@@ -10,19 +10,19 @@
 
 <!-- GEN:START docmap -->
 | ## 1. Project Overview | 28–43 |
-| ## 2. Directory Structure | 44–217 |
-| ## 3. Installation Flow | 218–276 |
-| ## 4. The `pos` CLI System | 277–365 |
-| ## 5. Shared Library — `lib/common.sh` | 366–397 |
-| ## 6. Docker Compose / ScaleTail | 398–440 |
-| ## 7. Optional Apps (`apps/`) | 441–470 |
-| ## 8. Entertainment Module | 471–484 |
-| ## 9. Systemd Services | 485–496 |
-| ## 10. Configuration Files | 497–523 |
-| ## 11. Coding Conventions | 524–556 |
-| ## 12. Development Workflow | 557–609 |
-| ## 13. Key File Quick Reference | 610–693 |
-| ## 14. Common Tasks for Agents | 694–727 |
+| ## 2. Directory Structure | 44–218 |
+| ## 3. Installation Flow | 219–277 |
+| ## 4. The `pos` CLI System | 278–367 |
+| ## 5. Shared Library — `lib/common.sh` | 368–399 |
+| ## 6. Docker Compose / ScaleTail | 400–442 |
+| ## 7. Optional Apps (`apps/`) | 443–472 |
+| ## 8. Entertainment Module | 473–486 |
+| ## 9. Systemd Services | 487–498 |
+| ## 10. Configuration Files | 499–525 |
+| ## 11. Coding Conventions | 526–558 |
+| ## 12. Development Workflow | 559–611 |
+| ## 13. Key File Quick Reference | 612–696 |
+| ## 14. Common Tasks for Agents | 697–730 |
 <!-- GEN:END docmap -->
 
 ## 1. Project Overview
@@ -117,6 +117,7 @@ Linux_post_install/
 │   ├── pos-system-schedule                 # Scheduled jobs: run a command on a timer; notify on threshold/change/error/always or silently
 │   ├── pos-system-uninstall                # Remove pos toolkit binaries, services, shell integration, config, and data
 │   ├── pos-ai                              # AI assistant: ask, chat, sessions, capture, models, providers
+│   ├── pos-bank                            # Persistent command bank for saving and running shell commands
 │   ├── pos-config                          # Interactive editor for the tools' runtime config (reads # POS_CONFIG: registry)
 │   ├── pos-tree                            # Show the pos CLI command tree: categories, commands, and subcommands
 <!-- GEN:END tree -->
@@ -343,6 +344,7 @@ All non-interactive `pos` commands log output to `~/.local/share/linux_post_inst
 | system | schedule | `pos-system-schedule` | Scheduled jobs: run a command on a timer; notify on threshold/change/error/always or silently |  |  |
 | system | uninstall | `pos-system-uninstall` | Remove pos toolkit binaries, services, shell integration, config, and data |  |  |
 |  | ai | `pos-ai` | AI assistant: ask, chat, sessions, capture, models, providers |  |  |
+|  | bank | `pos-bank` | Persistent command bank for saving and running shell commands |  |  |
 |  | config | `pos-config` | Interactive editor for the tools' runtime config (reads # POS_CONFIG: registry) |  |  |
 |  | tree | `pos-tree` | Show the pos CLI command tree: categories, commands, and subcommands |  |  |
 <!-- GEN:END dispatch -->
@@ -683,9 +685,10 @@ Use conventional prefixes: `feat:`, `fix:`, `docs:`, `refactor:`, `chore:`
 | `bin/pos-system-schedule` | 151 | Scheduled jobs: run a command on a timer; notify on threshold/change/error/always or silently |
 | `bin/pos-system-uninstall` | 517 | Remove pos toolkit binaries, services, shell integration, config, and data |
 | `bin/pos-ai` | 714 | AI assistant: ask, chat, sessions, capture, models, providers |
+| `bin/pos-bank` | 313 | Persistent command bank for saving and running shell commands |
 | `bin/pos-config` | 80 | Interactive editor for the tools' runtime config (reads # POS_CONFIG: registry) |
 | `bin/pos-tree` | 118 | Show the pos CLI command tree: categories, commands, and subcommands |
-| `completions/pos.bash` | 317 | Dynamic bash completion |
+| `completions/pos.bash` | 318 | Dynamic bash completion |
 <!-- GEN:END filetable -->
 | `apps/install.sh` | 171 | App install/uninstall picker/orchestrator |
 
diff --git a/DOC/POS.md b/DOC/POS.md
index f18692a..79743e1 100644
--- a/DOC/POS.md
+++ b/DOC/POS.md
@@ -534,6 +534,30 @@ Feature-flag management CLIs (see [SCRIPTS.md → lib/flags.sh](SCRIPTS.md#libfl
 | `flag-set <name> [value]` | Set a flag, optionally with a value (requires sudo) |
 | `flag-clear <name>` | Unset a flag (requires sudo) |
 
+### bank
+
+**File:** `bin/pos-bank`
+
+Persistent command bank for saving and running shell commands. Commands are stored in `~/.config/linux_post_install/bank.env` (pipe-delimited: `name|description|command`). Supports parameterized templates with `{param}` placeholders that are substituted at run time (quoted for safe shell evaluation).
+
+On a TTY with no arguments, `pos bank` opens an interactive menu (list / add / run / edit / remove).
+
+| Command | Purpose |
+|---------|---------|
+| `pos bank list` | List all saved commands |
+| `pos bank add <name> [desc] [cmd]` | Add a new command (interactive for missing args) |
+| `pos bank show <name>` | Show command details and detected parameters |
+| `pos bank run <name> [key=val …]` | Run a command (interactive for missing params) |
+| `pos bank edit <name>` | Edit an existing command |
+| `pos bank remove <name>` | Remove a command |
+
+Example with parameters:
+
+```
+pos bank add convert "Convert video" "ffmpeg -i {input} -crf {quality} {output}"
+pos bank run convert input=clip.mp4 quality=23 output=clip.mkv
+```
+
 ### config
 
 **File:** `bin/pos-config`
diff --git a/bin/pos b/bin/pos
index 072486b..39de892 100755
--- a/bin/pos
+++ b/bin/pos
@@ -266,7 +266,7 @@ MAIN_LOG="$LOG_DIR/pos.log"
 log_cmd() { echo "[$(date '+%Y-%m-%d %H:%M:%S')] $* → exit $2" >> "$MAIN_LOG"; }
 
 # Commands that read from stdin interactively — only log invocation
-INTERACTIVE_CMDS="docker-compose docker-vbox network-hotspot system-firewall media-mp4 media-yt-mp4 media-sync system-backup system-uninstall share-usb-server share-smb-server share-smb-client share-nfs-client share-nfs-server communication-telegram-listener communication-matrix-listener ai ai-gemini ai-openrouter ai-llamacpp ai-alias system-alias system-schedule entertainment-config config"
+INTERACTIVE_CMDS="bank docker-compose docker-vbox network-hotspot system-firewall media-mp4 media-yt-mp4 media-sync system-backup system-uninstall share-usb-server share-smb-server share-smb-client share-nfs-client share-nfs-server communication-telegram-listener communication-matrix-listener ai ai-gemini ai-openrouter ai-llamacpp ai-alias system-alias system-schedule entertainment-config config"
 
 for ((i=n-1; i>=0; i--)); do
     cmd="pos"
diff --git a/bin/pos-bank b/bin/pos-bank
new file mode 100755
index 0000000..75cd78d
--- /dev/null
+++ b/bin/pos-bank
@@ -0,0 +1,313 @@
+#!/usr/bin/env bash
+set -euo pipefail
+# POS: bank — Persistent command bank for saving and running shell commands
+# POS_SUBCMDS: list add show run edit remove
+
+source "$(dirname "$0")/../lib/common.sh" 2>/dev/null || source "$(dirname "$0")/common.sh"
+source "$(dirname "$0")/../lib/menu-lib.sh" 2>/dev/null || source "$(dirname "$0")/menu-lib.sh"
+source "$(dirname "$0")/../lib/bank-lib.sh" 2>/dev/null || source "$(dirname "$0")/bank-lib.sh"
+
+usage() {
+    cat <<'EOF'
+Usage: pos bank [subcommand] [args]
+
+Persistent command bank for saving and running shell commands.
+
+Subcommands:
+  list                  List all saved commands
+  add <name> [desc] [cmd]  Add a new command (interactive if args missing)
+  show <name>           Show command details
+  run <name> [key=val ...] Run a command (interactive for missing params)
+  edit <name>           Edit an existing command
+  remove <name>         Remove a command
+
+Interactive menu:
+  pos bank              (no args on a terminal)
+
+Examples:
+  pos bank add disk-info "Disk usage" "df -h && du -sh /mnt/12T"
+  pos bank run disk-info
+  pos bank run convert-video input=/path/to/video.mp4 quality=23 output=/path/out.mp4
+EOF
+    exit 0
+}
+
+case "${1:-}" in
+    -h|--help) usage ;;
+esac
+
+# ── Interactive command picker ───────────────────────────────────
+_pick_command() {
+    bank_load
+    local count="${#BANK_NAMES[@]}"
+    if [ "$count" -eq 0 ]; then
+        warn "Command bank is empty — add one with: pos bank add <name> \"desc\" \"cmd\""
+        return 1
+    fi
+    local -a items=()
+    local i
+    for ((i = 0; i < count; i++)); do
+        if [ -n "${BANK_DESCS[$i]}" ]; then
+            items+=("${BANK_NAMES[$i]} — ${BANK_DESCS[$i]}")
+        else
+            items+=("${BANK_NAMES[$i]}")
+        fi
+    done
+    local choice
+    choice="$(menu_pick "Pick command" "${items[@]}")" || return 1
+    echo "${BANK_NAMES[$((choice - 1))]}"
+}
+
+# ── cmd_list ─────────────────────────────────────────────────────
+cmd_list() {
+    bank_load
+    local count="${#BANK_NAMES[@]}"
+    if [ "$count" -eq 0 ]; then
+        log "Command bank is empty — add one with: pos bank add <name> \"desc\" \"cmd\""
+        return 0
+    fi
+    echo
+    echo "COMMAND BANK"
+    echo
+    local i
+    for ((i = 0; i < count; i++)); do
+        if [ -n "${BANK_DESCS[$i]}" ]; then
+            printf '  %-25s %s\n' "${BANK_NAMES[$i]}" "${BANK_DESCS[$i]}"
+        else
+            printf '  %s\n' "${BANK_NAMES[$i]}"
+        fi
+    done
+    echo
+}
+
+# ── cmd_add ──────────────────────────────────────────────────────
+cmd_add() {
+    local name="" desc="" cmd=""
+    case $# in
+        0) ;;
+        1) name="$1" ;;
+        2) name="$1"; desc="$2" ;;
+        *) name="$1"; desc="$2"; cmd="$3" ;;
+    esac
+    if [ -z "$name" ]; then
+        name="$(menu_ask_value "Name")" || return 0
+    fi
+    if [ -z "$desc" ]; then
+        desc="$(menu_ask_value "Description" "")" || return 0
+    fi
+    if [ -z "$cmd" ]; then
+        cmd="$(menu_read_value "Command")" || return 0
+    fi
+    bank_valid_name "$name" || err "Invalid name: $name (use letters, numbers, hyphens, underscores)"
+    [ -n "$cmd" ] || err "Command cannot be empty"
+    bank_load
+    local i
+    for ((i = 0; i < ${#BANK_NAMES[@]}; i++)); do
+        [[ "${BANK_NAMES[$i]}" == "$name" ]] && err "Command '$name' already exists (use 'pos bank edit' to modify)"
+    done
+    bank_add "$name" "$desc" "$cmd"
+    ok "Saved: $name"
+}
+
+# ── cmd_show ─────────────────────────────────────────────────────
+cmd_show() {
+    [ -n "${1:-}" ] || err "Usage: pos bank show <name>"
+    local name="$1"
+    bank_load
+    local entry
+    entry="$(bank_get "$name")" || err "Command not found: $name"
+    local cmd_name cmd_desc cmd_cmd
+    cmd_name="$(printf '%s' "$entry" | cut -f1)"
+    cmd_desc="$(printf '%s' "$entry" | cut -f2)"
+    cmd_cmd="$(printf '%s' "$entry" | cut -f3)"
+    echo
+    echo "Name: $cmd_name"
+    echo
+    echo "Description:"
+    if [ -n "$cmd_desc" ]; then
+        echo "$cmd_desc"
+    else
+        echo "  (none)"
+    fi
+    echo
+    echo "Command:"
+    echo
+    echo "$cmd_cmd"
+    local params
+    params="$(_extract_params "$cmd_cmd")"
+    if [ -n "$params" ]; then
+        echo
+        echo "Parameters:"
+        echo "$params" | while IFS= read -r p; do
+            echo "  $p"
+        done
+    fi
+    echo
+}
+
+# ── cmd_run ──────────────────────────────────────────────────────
+cmd_run() {
+    local name="" -a cli_params=()
+    if [ $# -eq 0 ]; then
+        name="$(_pick_command)" || return 0
+    else
+        name="$1"; shift
+        while [ $# -gt 0 ]; do
+            case "$1" in
+                *=*) cli_params+=("$1") ;;
+                *) err "Invalid parameter format: $1 (expected key=value)" ;;
+            esac
+            shift
+        done
+    fi
+    bank_load
+    local entry
+    entry="$(bank_get "$name")" || err "Command not found: $name"
+    local cmd_name cmd_desc cmd_cmd
+    cmd_name="$(printf '%s' "$entry" | cut -f1)"
+    cmd_desc="$(printf '%s' "$entry" | cut -f2)"
+    cmd_cmd="$(printf '%s' "$entry" | cut -f3)"
+    # Detect parameters
+    local params_str
+    params_str="$(_extract_params "$cmd_cmd")"
+    local -a params=()
+    if [ -n "$params_str" ]; then
+        while IFS= read -r p; do
+            params+=("$p")
+        done <<< "$params_str"
+    fi
+    # Build parameter values from CLI args
+    local -A param_values=()
+    for p in "${cli_params[@]}"; do
+        local key="${p%%=*}" val="${p#*=}"
+        param_values["$key"]="$val"
+    done
+    # Interactively prompt for missing parameters
+    local -a missing=()
+    for p in "${params[@]}"; do
+        [[ -z "${param_values[$p]+x}" ]] && missing+=("$p")
+    done
+    if [ ${#missing[@]} -gt 0 ]; then
+        for p in "${missing[@]}"; do
+            local val
+            val="$(menu_ask_value "$p" "")" || return 0
+            param_values["$p"]="$val"
+        done
+    fi
+    # Substitute parameters
+    local final_cmd="$cmd_cmd"
+    if [ ${#params[@]} -gt 0 ]; then
+        local -a sub_args=()
+        for p in "${params[@]}"; do
+            sub_args+=("${p}=${param_values[$p]:-}")
+        done
+        final_cmd="$(_substitute_params "$cmd_cmd" "${sub_args[@]}")"
+    fi
+    echo
+    log "Running: $final_cmd"
+    echo
+    eval "$final_cmd"
+    return $?
+}
+
+# ── cmd_edit ─────────────────────────────────────────────────────
+cmd_edit() {
+    local name="${1:-}"
+    if [ -z "$name" ]; then
+        name="$(_pick_command)" || return 0
+    fi
+    bank_load
+    local entry
+    entry="$(bank_get "$name")" || err "Command not found: $name"
+    local old_name old_desc old_cmd
+    old_name="$(printf '%s' "$entry" | cut -f1)"
+    old_desc="$(printf '%s' "$entry" | cut -f2)"
+    old_cmd="$(printf '%s' "$entry" | cut -f3)"
+    echo
+    log "Editing: $old_name"
+    echo
+    local new_name new_desc new_cmd
+    new_name="$(menu_ask_value "New name" "$old_name")" || return 0
+    new_desc="$(menu_ask_value "New description" "$old_desc")" || return 0
+    new_cmd="$(menu_read_value "New command")" || return 0
+    [ -z "$new_name" ] && new_name="$old_name"
+    [ -z "$new_desc" ] && new_desc="$old_desc"
+    [ -z "$new_cmd" ] && new_cmd="$old_cmd"
+    if [ "$new_name" != "$old_name" ]; then
+        bank_valid_name "$new_name" || err "Invalid name: $new_name"
+        local i found=0
+        for ((i = 0; i < ${#BANK_NAMES[@]}; i++)); do
+            [[ "${BANK_NAMES[$i]}" == "$new_name" ]] && found=1
+        done
+        [[ "$found" -eq 1 ]] && err "A command named '$new_name' already exists"
+        bank_remove "$old_name"
+        bank_add "$new_name" "$new_desc" "$new_cmd"
+    else
+        bank_update "$new_name" "$new_desc" "$new_cmd"
+    fi
+    ok "Updated: $new_name"
+}
+
+# ── cmd_remove ───────────────────────────────────────────────────
+cmd_remove() {
+    local name="${1:-}"
+    if [ -z "$name" ]; then
+        name="$(_pick_command)" || return 0
+    fi
+    bank_load
+    bank_find "$name" >/dev/null 2>&1 || err "Command not found: $name"
+    if [ -t 0 ]; then
+        confirm "Remove '$name'?" n || { log "Cancelled"; return 0; }
+    fi
+    bank_remove "$name"
+    ok "Removed: $name"
+}
+
+# ── Interactive menu ─────────────────────────────────────────────
+run_menu() {
+    menu_guard || exit 1
+    while true; do
+        local choice
+        choice="$(menu_run "Command Bank" \
+            "List commands" \
+            "Add command" \
+            "Run command" \
+            "Edit command" \
+            "Remove command")" || return 0
+        case "$choice" in
+            1) cmd_list ;;
+            2) cmd_add ;;
+            3) cmd_run ;;
+            4) cmd_edit ;;
+            5) cmd_remove ;;
+        esac
+    done
+}
+
+# ── Dispatch ─────────────────────────────────────────────────────
+if [ "${1:-}" = "menu" ]; then
+    run_menu
+    exit 0
+fi
+
+for arg in "$@"; do
+    case "$arg" in
+        -h|--help) usage ;;
+    esac
+done
+
+if [ $# -eq 0 ] && [ -t 0 ]; then
+    run_menu
+    exit 0
+fi
+
+case "${1:-}" in
+    list)   shift; cmd_list "$@" ;;
+    add)    shift; cmd_add "$@" ;;
+    show)   shift; cmd_show "$@" ;;
+    run)    shift; cmd_run "$@" ;;
+    edit)   shift; cmd_edit "$@" ;;
+    remove) shift; cmd_remove "$@" ;;
+    "")     usage ;;
+    *)      err "Unknown subcommand: $1 (see --help)" ;;
+esac
diff --git a/completions/pos.bash b/completions/pos.bash
index 0160284..ffebfc6 100644
--- a/completions/pos.bash
+++ b/completions/pos.bash
@@ -53,6 +53,7 @@ _pos_subcmds[system-alias]="create edit remove list show"
 _pos_subcmds[system-backup]="menu"
 _pos_subcmds[system-schedule]="run list config enable disable status migrate menu"
 _pos_subcmds[ai]="ask chat sessions capture models providers llamacpp alias gemini hf openrouter server"
+_pos_subcmds[bank]="list add show run edit remove"
 # GEN:END possubcmds
 # GEN:START posconfigscopes
 declare -a _pos_config_scopes=(ai compose entertainment grab matrix notify scrcpy system telegram ytsync)
diff --git a/lib/bank-lib.sh b/lib/bank-lib.sh
new file mode 100644
index 0000000..4bf7866
--- /dev/null
+++ b/lib/bank-lib.sh
@@ -0,0 +1,175 @@
+#!/usr/bin/env bash
+# lib/bank-lib.sh — shared storage helpers for the Command Bank.
+# Sourced by bin/pos-bank. Uses err() from lib/common.sh.
+#
+# Storage: ~/.config/linux_post_install/bank.env
+# Format:  name|description|command
+#
+# Contracts:
+#   * Defines ONLY bank_* functions — sourcing never clobbers a tool's helpers.
+#   * Requires common.sh to be sourced by the CALLER.
+#   * NEVER exits — return codes only.
+#   * Performs NO interactive prompts (those stay in bin/pos-bank).
+
+CONFIG_DIR="${CONFIG_DIR:-${XDG_CONFIG_HOME:-$HOME/.config}/linux_post_install}"
+BANK_FILE="${BANK_FILE:-${CONFIG_DIR}/bank.env}"
+
+# ── Load ────────────────────────────────────────────────────────
+# Populate parallel arrays: BANK_NAMES, BANK_DESCS, BANK_CMDS.
+bank_load() {
+    BANK_NAMES=(); BANK_DESCS=(); BANK_CMDS=()
+    [ -f "$BANK_FILE" ] || return 0
+
+    local line name desc cmd
+    while IFS= read -r line; do
+        [[ "$line" =~ ^[[:space:]]*# ]] && continue
+        [[ -z "${line// /}" ]] && continue
+        IFS='|' read -r name desc cmd <<< "$line"
+        [[ -z "$name" ]] && continue
+        BANK_NAMES+=("$name")
+        BANK_DESCS+=("${desc:-}")
+        BANK_CMDS+=("${cmd:-}")
+    done < "$BANK_FILE"
+}
+
+# ── Save ────────────────────────────────────────────────────────
+# Atomic overwrite from parallel arrays.
+bank_save() {
+    local dir
+    dir="$(dirname "$BANK_FILE")"
+    mkdir -p "$dir"
+    local tmp
+    tmp="$(mktemp "${dir}/.bank.XXXXXX")"
+    {
+        printf '%s\n' "# Command Bank — managed by pos bank (do not hand-edit)"
+        printf '%s\n' "# Format: name|description|command"
+        local i
+        for ((i = 0; i < ${#BANK_NAMES[@]}; i++)); do
+            printf '%s|%s|%s\n' "${BANK_NAMES[$i]}" "${BANK_DESCS[$i]}" "${BANK_CMDS[$i]}"
+        done
+    } > "$tmp"
+    chmod 600 "$tmp"
+    mv "$tmp" "$BANK_FILE"
+}
+
+# ── Add ─────────────────────────────────────────────────────────
+bank_add() {
+    local name="$1" desc="$2" cmd="$3"
+    bank_load
+    local i
+    for ((i = 0; i < ${#BANK_NAMES[@]}; i++)); do
+        [[ "${BANK_NAMES[$i]}" == "$name" ]] && return 1
+    done
+    BANK_NAMES+=("$name")
+    BANK_DESCS+=("$desc")
+    BANK_CMDS+=("$cmd")
+    bank_save
+}
+
+# ── Remove ──────────────────────────────────────────────────────
+bank_remove() {
+    local name="$1"
+    bank_load
+    local found=0 i
+    for ((i = 0; i < ${#BANK_NAMES[@]}; i++)); do
+        if [[ "${BANK_NAMES[$i]}" == "$name" ]]; then
+            unset 'BANK_NAMES[i]'
+            unset 'BANK_DESCS[i]'
+            unset 'BANK_CMDS[i]'
+            found=1
+            break
+        fi
+    done
+    [[ "$found" -eq 1 ]] || return 1
+    # Re-index arrays (unset leaves gaps)
+    BANK_NAMES=("${BANK_NAMES[@]}")
+    BANK_DESCS=("${BANK_DESCS[@]}")
+    BANK_CMDS=("${BANK_CMDS[@]}")
+    bank_save
+}
+
+# ── Update ──────────────────────────────────────────────────────
+bank_update() {
+    local name="$1" desc="$2" cmd="$3"
+    bank_load
+    local i
+    for ((i = 0; i < ${#BANK_NAMES[@]}; i++)); do
+        if [[ "${BANK_NAMES[$i]}" == "$name" ]]; then
+            BANK_DESCS[$i]="$desc"
+            BANK_CMDS[$i]="$cmd"
+            bank_save
+            return 0
+        fi
+    done
+    return 1
+}
+
+# ── Find (by name) ──────────────────────────────────────────────
+# Sets BANK_IDX. Returns 0 if found, 1 if not.
+bank_find() {
+    local name="$1"
+    bank_load
+    local i
+    for ((i = 0; i < ${#BANK_NAMES[@]}; i++)); do
+        if [[ "${BANK_NAMES[$i]}" == "$name" ]]; then
+            BANK_IDX=$i
+            return 0
+        fi
+    done
+    return 1
+}
+
+# ── Get (by name) ───────────────────────────────────────────────
+# Outputs: name\tdescription\tcommand (tab-separated).
+bank_get() {
+    local name="$1"
+    bank_find "$name" || return 1
+    printf '%s\t%s\t%s\n' "${BANK_NAMES[$BANK_IDX]}" "${BANK_DESCS[$BANK_IDX]}" "${BANK_CMDS[$BANK_IDX]}"
+}
+
+# ── List names ──────────────────────────────────────────────────
+bank_list_names() {
+    bank_load
+    local i
+    for ((i = 0; i < ${#BANK_NAMES[@]}; i++)); do
+        printf '%s\n' "${BANK_NAMES[$i]}"
+    done
+}
+
+# ── Count ───────────────────────────────────────────────────────
+bank_count() {
+    bank_load
+    echo "${#BANK_NAMES[@]}"
+}
+
+# ── Validate name ───────────────────────────────────────────────
+bank_valid_name() {
+    [[ "$1" =~ ^[a-zA-Z][a-zA-Z0-9_-]*$ ]]
+}
+
+# ── Extract {param} names from a command template ───────────────
+_extract_params() {
+    local cmd="$1"
+    grep -oE '\{[a-zA-Z_][a-zA-Z0-9_]*\}' <<< "$cmd" 2>/dev/null | \
+        sed 's/[{}]//g' | \
+        awk '!seen[$0]++' || true
+}
+
+# ── Substitute {param} with quoted values ───────────────────────
+# Usage: _substitute_params "cmd template" "key1=val1" "key2=val2" ...
+# Uses awk to build quoted replacements safely, avoiding bash quote-nesting.
+_substitute_params() {
+    local cmd="$1"; shift
+    # Build a sed expression: for each key=val, replace {key} with "val"
+    local sed_expr=""
+    while [ $# -gt 0 ]; do
+        local key="${1%%=*}"
+        local val="${1#*=}"
+        # Escape sed special chars in the value
+        val="${val//\\/\\\\}"
+        val="${val//\//\\/}"
+        sed_expr+="s/{${key}}/\"${val}\"/g; "
+        shift
+    done
+    [ -n "$sed_expr" ] && printf '%s' "$cmd" | sed "$sed_expr" || printf '%s' "$cmd"
+}
diff --git a/tests/README.md b/tests/README.md
index 27022ec..3d38599 100644
--- a/tests/README.md
+++ b/tests/README.md
@@ -56,4 +56,5 @@ silently.
 | `t-install-version.sh` | install.sh version gate: match→skip, mismatch→proceed, --force bypass, dry-run variant, flag write, numeric comparison |
 | `t-share-mountpoint.sh` | share-client `ask_mountpoint` UX: existing/new/declined/rejected paths, confirm gate, mkdir side effects, non-TTY stdin contract, static `n`→`t` guards |
 | `t-pos-media-yt.sh` | unified `pos media yt` suite: dispatcher + forwarder resolution, shared yt-lib helpers, yt-mp3/mp4/grab/subtitles flags, dry-run deps, `YT_OUT_DIR` seam, `GRAB_DEFAULT` config, negative controls (unsafe-URL no-expansion, `--lang en,ar` single arg, txt timestamp-stripping) |
-| `t-telegram-listener-singleton.sh` | Telegram listener single-instance guard: first `--run` acquires the flock, second `--run` fails fast with the exact message, lock auto-releases so the next start is clean, `--status` reports the lock state |
\ No newline at end of file
+| `t-telegram-listener-singleton.sh` | Telegram listener single-instance guard: first `--run` acquires the flock, second `--run` fails fast with the exact message, lock auto-releases so the next start is clean, `--status` reports the lock state |
+| `t-bank.sh` | Command Bank: bank-lib.sh unit tests (add/remove/update/find/get/list/count/valid/extract_params/substitute_params) + pos-bank CLI integration (help, list, add, show, remove, params, invalid name) |
\ No newline at end of file
diff --git a/tests/bank-test-helper.sh b/tests/bank-test-helper.sh
new file mode 100644
index 0000000..0f02818
--- /dev/null
+++ b/tests/bank-test-helper.sh
@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+# tests/bank-test-helper.sh — minimal shim that sources bank-lib.sh for unit
+# testing.  Provides a stub `err()` so bank-lib.sh can load without the full
+# common.sh / menu-lib.sh dependency chain.
+set -euo pipefail
+
+# Stub err() — bank-lib.sh is contractually "never exits" but bank_valid_name
+# callers sometimes chain via `|| err …`.  This version returns 1 so the test
+# harness can assert rc.
+err() { printf 'ERROR: %s\n' "$*" >&2; return 1; }
+
+# Source the library under test.
+source "$ROOT/lib/bank-lib.sh"
diff --git a/tests/t-bank.sh b/tests/t-bank.sh
new file mode 100755
index 0000000..f0db244
--- /dev/null
+++ b/tests/t-bank.sh
@@ -0,0 +1,337 @@
+#!/usr/bin/env bash
+set -euo pipefail
+# t-bank.sh — Command Bank feature: bank-lib.sh unit tests + pos-bank CLI
+# integration tests.
+#
+# Storage contract: pipe-delimited name|description|command in $BANK_FILE.
+# Parameter syntax: {param} placeholders in command templates.
+
+run_test() {
+    local sandbox helper
+    sandbox="$(mksandbox bank)"
+    helper="$sandbox/helper.sh"
+
+    # ── Build a sourced helper that gives us bank-lib functions ──
+    cat > "$helper" <<'HELPER'
+source "$ROOT/tests/bank-test-helper.sh"
+HELPER
+
+    # ═══════════════════════════════════════════════════════════════
+    # Part A: bank-lib.sh unit tests
+    # ═══════════════════════════════════════════════════════════════
+
+    # A1: bank_add + bank_load — add two entries, verify arrays
+    (
+        BANK_FILE="$sandbox/a1.bank.env"
+        : > "$BANK_FILE"
+        source "$helper"
+        bank_add "deploy" "Deploy to prod" "ssh prod 'cd /app && git pull'"
+        bank_add "backup" "Backup database" "pg_dump mydb | gzip > /tmp/db.sql.gz"
+        bank_load
+        # Check arrays
+        [ "${#BANK_NAMES[@]}" -eq 2 ] || { echo "FAIL A1: expected 2 names, got ${#BANK_NAMES[@]}"; exit 1; }
+        [ "${BANK_NAMES[0]}" = "deploy" ] || { echo "FAIL A1: name[0] mismatch"; exit 1; }
+        [ "${BANK_DESCS[0]}" = "Deploy to prod" ] || { echo "FAIL A1: desc[0] mismatch"; exit 1; }
+        [ "${BANK_CMDS[1]}" = "pg_dump mydb | gzip > /tmp/db.sql.gz" ] || { echo "FAIL A1: cmd[1] mismatch"; exit 1; }
+        echo "PASS A1: bank_add + bank_load populates arrays correctly"
+    ) && printf '  PASS  bank_add + bank_load populates arrays\n' \
+      || printf '  FAIL  bank_add + bank_load populates arrays\n'
+
+    # A2: bank_add duplicate — returns rc 1
+    (
+        BANK_FILE="$sandbox/a2.bank.env"
+        printf 'old|Old cmd|echo old\n' > "$BANK_FILE"
+        source "$helper"
+        bank_add "old" "New desc" "echo new"
+        exit $?
+    )
+    check_rc "bank_add duplicate returns rc 1" 1 $?
+
+    # A3: bank_remove — remove entry, verify gone
+    (
+        BANK_FILE="$sandbox/a3.bank.env"
+        printf 'aaa|desc a|cmd a\nbbb|desc b|cmd b\nccc|desc c|cmd c\n' > "$BANK_FILE"
+        source "$helper"
+        bank_remove "bbb"
+        bank_load
+        [ "${#BANK_NAMES[@]}" -eq 2 ] || { echo "FAIL A3: expected 2, got ${#BANK_NAMES[@]}"; exit 1; }
+        [ "${BANK_NAMES[0]}" = "aaa" ] || { echo "FAIL A3: name[0] mismatch"; exit 1; }
+        [ "${BANK_NAMES[1]}" = "ccc" ] || { echo "FAIL A3: name[1] mismatch"; exit 1; }
+        # Verify file on disk
+        grep -q '^bbb|' "$BANK_FILE" && { echo "FAIL A3: bbb still in file"; exit 1; }
+        echo "PASS A3: bank_remove"
+    ) && printf '  PASS  bank_remove removes entry\n' \
+      || printf '  FAIL  bank_remove removes entry\n'
+
+    # A4: bank_remove missing — returns rc 1
+    (
+        BANK_FILE="$sandbox/a4.bank.env"
+        printf 'xxx|desc|cmd\n' > "$BANK_FILE"
+        source "$helper"
+        bank_remove "nonexistent"
+        exit $?
+    )
+    check_rc "bank_remove missing returns rc 1" 1 $?
+
+    # A5: bank_update — update entry, verify changed
+    (
+        BANK_FILE="$sandbox/a5.bank.env"
+        printf 'mycmd|old desc|old cmd\n' > "$BANK_FILE"
+        source "$helper"
+        bank_update "mycmd" "new desc" "new cmd"
+        bank_load
+        [ "${BANK_DESCS[0]}" = "new desc" ] || { echo "FAIL A5: desc mismatch"; exit 1; }
+        [ "${BANK_CMDS[0]}" = "new cmd" ] || { echo "FAIL A5: cmd mismatch"; exit 1; }
+        # Verify on disk
+        grep -q 'new desc|new cmd' "$BANK_FILE" || { echo "FAIL A5: not persisted"; exit 1; }
+        echo "PASS A5: bank_update"
+    ) && printf '  PASS  bank_update updates entry\n' \
+      || printf '  FAIL  bank_update updates entry\n'
+
+    # A6: bank_update missing — returns rc 1
+    (
+        BANK_FILE="$sandbox/a6.bank.env"
+        printf 'exists|desc|cmd\n' > "$BANK_FILE"
+        source "$helper"
+        bank_update "nope" "desc" "cmd"
+        exit $?
+    )
+    check_rc "bank_update missing returns rc 1" 1 $?
+
+    # A7: bank_find — found sets BANK_IDX, not-found returns 1
+    (
+        BANK_FILE="$sandbox/a7.bank.env"
+        printf 'alpha|d1|c1\nbeta|d2|c2\ngamma|d3|c3\n' > "$BANK_FILE"
+        source "$helper"
+        bank_find "beta"
+        [ "${BANK_IDX:-}" = "1" ] || { echo "FAIL A7: expected BANK_IDX=1, got ${BANK_IDX:-unset}"; exit 1; }
+        bank_find "nonexistent" && { echo "FAIL A7: should return 1 for missing"; exit 1; }
+        echo "PASS A7: bank_find"
+    ) && printf '  PASS  bank_find sets BANK_IDX / returns 1\n' \
+      || printf '  FAIL  bank_find sets BANK_IDX / returns 1\n'
+
+    # A8: bank_get — returns tab-separated output
+    (
+        BANK_FILE="$sandbox/a8.bank.env"
+        printf 'mytool|My Tool|echo hello\n' > "$BANK_FILE"
+        source "$helper"
+        local out
+        out="$(bank_get "mytool")"
+        [ "$out" = "mytool	My Tool	echo hello" ] || { echo "FAIL A8: unexpected output [$out]"; exit 1; }
+        echo "PASS A8: bank_get"
+    ) && printf '  PASS  bank_get returns tab-separated output\n' \
+      || printf '  FAIL  bank_get returns tab-separated output\n'
+
+    # A9: bank_list_names — lists all names
+    (
+        BANK_FILE="$sandbox/a9.bank.env"
+        printf 'one|x|y\ntwo|a|b\nthree|c|d\n' > "$BANK_FILE"
+        source "$helper"
+        local names
+        names="$(bank_list_names)"
+        local expected
+        expected="$(printf 'one\ntwo\nthree')"
+        [ "$names" = "$expected" ] || { echo "FAIL A9: expected [$expected] got [$names]"; exit 1; }
+        echo "PASS A9: bank_list_names"
+    ) && printf '  PASS  bank_list_names lists all names\n' \
+      || printf '  FAIL  bank_list_names lists all names\n'
+
+    # A10: bank_count — returns correct count
+    (
+        BANK_FILE="$sandbox/a10.bank.env"
+        printf 'a|1|2\nb|3|4\nc|5|6\nd|7|8\n' > "$BANK_FILE"
+        source "$helper"
+        local cnt
+        cnt="$(bank_count)"
+        [ "$cnt" -eq 4 ] || { echo "FAIL A10: expected 4, got $cnt"; exit 1; }
+        echo "PASS A10: bank_count"
+    ) && printf '  PASS  bank_count returns correct count\n' \
+      || printf '  FAIL  bank_count returns correct count\n'
+
+    # A11: bank_count — empty file returns 0
+    (
+        BANK_FILE="$sandbox/a11.bank.env"
+        : > "$BANK_FILE"
+        source "$helper"
+        local cnt
+        cnt="$(bank_count)"
+        [ "$cnt" -eq 0 ] || { echo "FAIL A11: expected 0, got $cnt"; exit 1; }
+        echo "PASS A11: bank_count empty"
+    ) && printf '  PASS  bank_count returns 0 for empty file\n' \
+      || printf '  FAIL  bank_count returns 0 for empty file\n'
+
+    # A12: bank_valid_name — valid names pass
+    (
+        source "$helper"
+        local fail=0
+        for n in "deploy" "my-cmd" "test_123" "A" "z9"; do
+            bank_valid_name "$n" || { fail=1; printf 'FAIL A12: %s should be valid\n' "$n" >&2; }
+        done
+        [ "$fail" -eq 0 ] || exit 1
+        echo "PASS A12: bank_valid_name accepts valid names"
+    ) && printf '  PASS  bank_valid_name accepts valid names\n' \
+      || printf '  FAIL  bank_valid_name accepts valid names\n'
+
+    # A13: bank_valid_name — invalid names fail
+    (
+        source "$helper"
+        local fail=0
+        for n in "" "1abc" "-start" "_under" "has space" "special!"; do
+            bank_valid_name "$n" && { fail=1; printf 'FAIL A13: %s should be invalid\n' "$n" >&2; }
+        done
+        [ "$fail" -eq 0 ] || exit 1
+        echo "PASS A13: bank_valid_name rejects invalid names"
+    ) && printf '  PASS  bank_valid_name rejects invalid names\n' \
+      || printf '  FAIL  bank_valid_name rejects invalid names\n'
+
+    # A14: _extract_params — extracts {param} names from template
+    (
+        source "$helper"
+        local params
+        params="$(_extract_params "echo {name} {path}")"
+        local expected
+        expected="$(printf 'name\npath')"
+        [ "$params" = "$expected" ] || { echo "FAIL A14: expected [$expected] got [$params]"; exit 1; }
+        echo "PASS A14: _extract_params"
+    ) && printf '  PASS  _extract_params extracts param names\n' \
+      || printf '  FAIL  _extract_params extracts param names\n'
+
+    # A15: _extract_params — no params returns empty
+    (
+        source "$helper"
+        local params
+        params="$(_extract_params "echo hello world")"
+        [ -z "$params" ] || { echo "FAIL A15: expected empty, got [$params]"; exit 1; }
+        echo "PASS A15: _extract_params empty"
+    ) && printf '  PASS  _extract_params returns empty for no params\n' \
+      || printf '  FAIL  _extract_params returns empty for no params\n'
+
+    # A16: _extract_params — deduplicates repeated params
+    (
+        source "$helper"
+        local params
+        params="$(_extract_params "cp {src} {dst} && ls {src}")"
+        local count
+        count="$(printf '%s' "$params" | grep -c '^src$' || true)"
+        [ "$count" -eq 1 ] || { echo "FAIL A16: expected 1 occurrence of src, got $count"; exit 1; }
+        echo "PASS A16: _extract_params deduplicates"
+    ) && printf '  PASS  _extract_params deduplicates\n' \
+      || printf '  FAIL  _extract_params deduplicates\n'
+
+    # A17: _substitute_params — replaces {param} with quoted values
+    (
+        source "$helper"
+        local result
+        result="$(_substitute_params "scp {file} user@host:{dest}" "file=/tmp/data.csv" "dest=/var/data")"
+        local expected='scp "/tmp/data.csv" user@host:"/var/data"'
+        [ "$result" = "$expected" ] || { echo "FAIL A17: expected [$expected] got [$result]"; exit 1; }
+        echo "PASS A17: _substitute_params"
+    ) && printf '  PASS  _substitute_params replaces params\n' \
+      || printf '  FAIL  _substitute_params replaces params\n'
+
+    # A18: bank_load — comments and blank lines are skipped
+    (
+        BANK_FILE="$sandbox/a18.bank.env"
+        cat > "$BANK_FILE" <<'BANK'
+# Command Bank — managed by pos bank (do not hand-edit)
+# Format: name|description|command
+
+real|Real command|echo real
+# another comment
+
+  # indented comment
+  
+BANK
+        source "$helper"
+        bank_load
+        [ "${#BANK_NAMES[@]}" -eq 1 ] || { echo "FAIL A18: expected 1, got ${#BANK_NAMES[@]}"; exit 1; }
+        [ "${BANK_NAMES[0]}" = "real" ] || { echo "FAIL A18: name mismatch"; exit 1; }
+        echo "PASS A18: bank_load skips comments and blanks"
+    ) && printf '  PASS  bank_load skips comments and blank lines\n' \
+      || printf '  FAIL  bank_load skips comments and blank lines\n'
+
+    # ═══════════════════════════════════════════════════════════════
+    # Part B: pos-bank CLI integration tests
+    # ═══════════════════════════════════════════════════════════════
+
+    local pos_bank="$ROOT/bin/pos-bank"
+
+    # B1: pos bank --help shows usage
+    test_run env BANK_FILE="$sandbox/b1.bank.env" "$pos_bank" --help
+    check_rc "pos bank --help exits 0" 0 "$TR_RC"
+    check_contains "pos bank --help shows Usage" "Usage:" "$TR_OUT"
+    check_contains "pos bank --help mentions subcommands" "Subcommands:" "$TR_OUT"
+
+    # B2: pos bank list on empty bank shows empty message
+    : > "$sandbox/b2.bank.env"
+    test_run env BANK_FILE="$sandbox/b2.bank.env" "$pos_bank" list
+    check_rc "pos bank list empty exits 0" 0 "$TR_RC"
+    check_contains "pos bank list empty message" "Command bank is empty" "$TR_OUT"
+
+    # B3: pos bank add — adds a command, verify in bank.env
+    : > "$sandbox/b3.bank.env"
+    test_run env BANK_FILE="$sandbox/b3.bank.env" "$pos_bank" add "disk-usage" "Check disk usage" "df -h"
+    check_rc "pos bank add exits 0" 0 "$TR_RC"
+    check_contains "pos bank add confirms" "Saved: disk-usage" "$TR_OUT"
+    # Verify the file
+    if grep -q '^disk-usage|Check disk usage|df -h$' "$sandbox/b3.bank.env"; then
+        printf '  PASS  pos bank add persists to bank.env\n'
+    else
+        printf '  FAIL  pos bank add did not persist to bank.env\n'
+    fi
+
+    # B4: pos bank add duplicate — fails
+    test_run env BANK_FILE="$sandbox/b3.bank.env" "$pos_bank" add "disk-usage" "dup" "echo dup"
+    check_not_contains "pos bank add duplicate errors" "0" "$TR_RC"
+    check_contains "pos bank add duplicate message" "already exists" "$TR_OUT"
+
+    # B5: pos bank show — shows command details
+    test_run env BANK_FILE="$sandbox/b3.bank.env" "$pos_bank" show "disk-usage"
+    check_rc "pos bank show exits 0" 0 "$TR_RC"
+    check_contains "pos bank show shows name" "Name: disk-usage" "$TR_OUT"
+    check_contains "pos bank show shows description" "Check disk usage" "$TR_OUT"
+    check_contains "pos bank show shows command" "df -h" "$TR_OUT"
+
+    # B6: pos bank show missing — fails
+    test_run env BANK_FILE="$sandbox/b3.bank.env" "$pos_bank" show "nonexistent"
+    check_not_contains "pos bank show missing exits non-zero" "0" "$TR_RC"
+    check_contains "pos bank show missing message" "not found" "$TR_OUT"
+
+    # B7: pos bank list after add — shows the entry
+    test_run env BANK_FILE="$sandbox/b3.bank.env" "$pos_bank" list
+    check_rc "pos bank list populated exits 0" 0 "$TR_RC"
+    check_contains "pos bank list shows header" "COMMAND BANK" "$TR_OUT"
+    check_contains "pos bank list shows entry" "disk-usage" "$TR_OUT"
+
+    # B8: pos bank remove — removes a command
+    test_run env BANK_FILE="$sandbox/b3.bank.env" "$pos_bank" remove "disk-usage"
+    check_rc "pos bank remove exits 0" 0 "$TR_RC"
+    check_contains "pos bank remove confirms" "Removed: disk-usage" "$TR_OUT"
+    # Verify gone
+    if grep -q '^disk-usage|' "$sandbox/b3.bank.env"; then
+        printf '  FAIL  pos bank remove did not delete from bank.env\n'
+    else
+        printf '  PASS  pos bank remove deletes from bank.env\n'
+    fi
+
+    # B9: pos bank remove missing — fails
+    : > "$sandbox/b9.bank.env"
+    test_run env BANK_FILE="$sandbox/b9.bank.env" "$pos_bank" remove "ghost"
+    check_not_contains "pos bank remove missing exits non-zero" "0" "$TR_RC"
+    check_contains "pos bank remove missing message" "not found" "$TR_OUT"
+
+    # B10: pos bank add with parameters — show lists them
+    : > "$sandbox/b10.bank.env"
+    test_run env BANK_FILE="$sandbox/b10.bank.env" "$pos_bank" add "convert" "Convert video" "ffmpeg -i {input} -q:v {quality} {output}"
+    check_rc "pos bank add with params exits 0" 0 "$TR_RC"
+    test_run env BANK_FILE="$sandbox/b10.bank.env" "$pos_bank" show "convert"
+    check_contains "show lists input param" "input" "$TR_OUT"
+    check_contains "show lists quality param" "quality" "$TR_OUT"
+    check_contains "show lists output param" "output" "$TR_OUT"
+
+    # B11: pos bank add invalid name — fails
+    : > "$sandbox/b11.bank.env"
+    test_run env BANK_FILE="$sandbox/b11.bank.env" "$pos_bank" add "1bad" "desc" "cmd"
+    check_not_contains "pos bank add invalid name exits non-zero" "0" "$TR_RC"
+    check_contains "pos bank add invalid name message" "Invalid name" "$TR_OUT"
+}