diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1b95450..30bfa50 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -61,8 +61,10 @@ jobs:
         run: |
           fish fish/tests/w2-core.fish
           fish fish/tests/w3-helpers.fish
+          fish fish/tests/w4b-screenshots.fish
           fish fish/tests/w5a-hremote.fish
           fish fish/tests/w5b-herdr-ssh.fish
+          fish fish/tests/w6-agent-helpers.fish
 
       - name: Validate JSON configs
         shell: bash
diff --git a/README.md b/README.md
index 63953d8..3353f52 100644
--- a/README.md
+++ b/README.md
@@ -141,6 +141,31 @@ Para validar sin tocar identidades reales ni la red:
 /opt/homebrew/bin/fish fish/tests/w3-helpers.fish
 ```
 
+## Helpers Fish: screenshots (W4b)
+
+W4b agrega `ss`, `last`, `ssd` e `imgclip` sin capturar la pantalla ni leer el clipboard durante la carga. `SCREENSHOTS_DIR` usa el override solo si apunta a un directorio existente; si no, conserva el fallback de macOS: `~/Screenshots` cuando existe y luego `~/Desktop`. Home Manager mapea cada función explícitamente y no administra el directorio, screenshots ni clipboard del host.
+
+Para validar con `HOME`, `PATH` y comandos macOS falsos aislados:
+
+```bash
+/opt/homebrew/bin/fish fish/tests/w4b-screenshots.fish
+```
+
+## Helpers Fish de agentes (W6)
+
+**ADVERTENCIA:** por elección explícita del owner, `cc` ejecuta Claude Code con `--dangerously-skip-permissions` y `oc`/`ocb` ejecutan OpenCode con `--auto`; estos shortcuts intencionalmente omiten o autoaprueban permisos. W6 agrega `cc`, `oc`, `ocb`, `ccx`, `ccd` y `ccclip` como helpers Fish opt-in en el directorio validado; `ccx` entrega el contexto por stdin y `ccclip` escribe al clipboard solo al invocarse. No incluye `ccb`.
+
+| Área | Owner en W6 |
+| --- | --- |
+| Helpers y soporte privado | `fish/functions/{_cortex_resolve_target,_cortex_run_agent,cc,oc,ocb,ccx,ccd,ccclip}.fish` |
+| Home Manager | Mapea cada una de esas funciones de forma explícita; no administra binarios de agentes, clipboard, worktrees, estado, historial ni configuración de proveedores |
+
+Para validar con agentes y clipboard falsos aislados:
+
+```bash
+/opt/homebrew/bin/fish fish/tests/w6-agent-helpers.fish
+```
+
 ## Estructura
 
 ```
diff --git a/fish/functions/_cortex_resolve_target.fish b/fish/functions/_cortex_resolve_target.fish
new file mode 100644
index 0000000..72eeb40
--- /dev/null
+++ b/fish/functions/_cortex_resolve_target.fish
@@ -0,0 +1,11 @@
+function _cortex_resolve_target
+    set -l target "$argv[1]"
+    test -n "$target"; or set target .
+
+    if not test -d "$target"
+        printf 'Directorio no encontrado: %s\n' "$target" >&2
+        return 1
+    end
+
+    cd "$target"; and pwd
+end
diff --git a/fish/functions/_cortex_run_agent.fish b/fish/functions/_cortex_run_agent.fish
new file mode 100644
index 0000000..ff5cefd
--- /dev/null
+++ b/fish/functions/_cortex_run_agent.fish
@@ -0,0 +1,11 @@
+function _cortex_run_agent
+    set -l target "$argv[1]"
+    set -e argv[1]
+    set -l original_dir "$PWD"
+
+    cd "$target"; or return 1
+    command $argv
+    set -l agent_status $status
+    cd "$original_dir"; or return 1
+    return "$agent_status"
+end
diff --git a/fish/functions/_screenshot_files.fish b/fish/functions/_screenshot_files.fish
new file mode 100644
index 0000000..c77d08b
--- /dev/null
+++ b/fish/functions/_screenshot_files.fish
@@ -0,0 +1,20 @@
+function _screenshot_files
+    set -l directory (_screenshots_dir)
+    set -l files
+
+    # BSD find lacks GNU -maxdepth, so retain the source helper's two-level scope in Fish.
+    for file in (command find "$directory" -type f -print0 2>/dev/null | string split0)
+        set -l relative (string replace -- "$directory/" '' "$file")
+        set -l components (string split / -- "$relative")
+        test (count $components) -le 2; or continue
+
+        switch (path extension "$file")
+            case .png .jpg .jpeg .gif
+                set -a files "$file"
+        end
+    end
+
+    if test (count $files) -gt 0
+        command ls -t $files 2>/dev/null
+    end
+end
diff --git a/fish/functions/_screenshots_dir.fish b/fish/functions/_screenshots_dir.fish
new file mode 100644
index 0000000..17cfdcc
--- /dev/null
+++ b/fish/functions/_screenshots_dir.fish
@@ -0,0 +1,13 @@
+function _screenshots_dir
+    if set -q SCREENSHOTS_DIR; and test -n "$SCREENSHOTS_DIR"; and test -d "$SCREENSHOTS_DIR"
+        printf '%s\n' "$SCREENSHOTS_DIR"
+        return
+    end
+
+    set -l default "$HOME/Screenshots"
+    if test -d "$default"
+        printf '%s\n' "$default"
+    else
+        printf '%s\n' "$HOME/Desktop"
+    end
+end
diff --git a/fish/functions/_time_ago.fish b/fish/functions/_time_ago.fish
new file mode 100644
index 0000000..ea9236a
--- /dev/null
+++ b/fish/functions/_time_ago.fish
@@ -0,0 +1,20 @@
+function _time_ago
+    set -l file "$argv[1]"
+    set -l now (command date +%s)
+    set -l mtime (command stat -f %m "$file" 2>/dev/null)
+
+    if test $status -ne 0; or test -z "$mtime"
+        set mtime "$now"
+    end
+
+    set -l difference (math "$now - $mtime")
+    if test "$difference" -lt 60
+        printf 'justo ahora\n'
+    else if test "$difference" -lt 3600
+        printf '%sm ago\n' (math "$difference / 60")
+    else if test "$difference" -lt 86400
+        printf '%sh ago\n' (math "$difference / 3600")
+    else
+        printf '%sd ago\n' (math "$difference / 86400")
+    end
+end
diff --git a/fish/functions/cc.fish b/fish/functions/cc.fish
new file mode 100644
index 0000000..99531aa
--- /dev/null
+++ b/fish/functions/cc.fish
@@ -0,0 +1,5 @@
+# Usage: cc [path]
+function cc
+    set -l resolved (_cortex_resolve_target "$argv[1]"); or return 1
+    _cortex_run_agent "$resolved" claude --dangerously-skip-permissions
+end
diff --git a/fish/functions/ccclip.fish b/fish/functions/ccclip.fish
new file mode 100644
index 0000000..db8f35b
--- /dev/null
+++ b/fish/functions/ccclip.fish
@@ -0,0 +1,43 @@
+# Usage: ccclip <file...> [-n|--line-numbers]
+function ccclip
+    if test (count $argv) -eq 0
+        printf 'Uso: ccclip <archivo1> [archivo2 ...] [-n|--line-numbers]\n' >&2
+        return 1
+    end
+
+    set -l with_numbers false
+    set -l files
+    for arg in $argv
+        switch "$arg"
+            case -n --line-numbers
+                set with_numbers true
+            case '*'
+                set -a files "$arg"
+        end
+    end
+
+    begin
+        for file in $files
+            if not test -f "$file"
+                printf 'Archivo no encontrado: %s\n' "$file" >&2
+                continue
+            end
+
+            set -l extension (path extension "$file" | string trim -c .)
+            printf '```%s\n// File: %s\n' "$extension" "$file"
+            set -l content
+            if test "$with_numbers" = true
+                set content (nl -ba "$file" | string collect)
+            else
+                set content (command cat "$file" | string collect)
+            end
+            printf '%s\n```\n\n' "$content"
+        end
+    end | pbcopy
+    set -l clipboard_status $pipestatus[-1]
+    if test "$clipboard_status" -ne 0
+        return "$clipboard_status"
+    end
+
+    printf 'Contexto copiado al clipboard (%d archivos)\n' (count $files)
+end
diff --git a/fish/functions/ccd.fish b/fish/functions/ccd.fish
new file mode 100644
index 0000000..9f3fd98
--- /dev/null
+++ b/fish/functions/ccd.fish
@@ -0,0 +1,16 @@
+# Usage: ccd [subpath]
+function ccd
+    set -l subpath "$argv[1]"
+    set -l workspace "$WORKSPACE_DIR"
+    test -n "$workspace"; or set workspace "$HOME/dev"
+    set -l target "$workspace"
+    test -n "$subpath"; and set target "$workspace/$subpath"
+
+    if test -d "$target"
+        cd "$target"
+        printf 'Navegando a: %s\n' "$target"
+    else
+        printf 'Directorio no encontrado: %s\n' "$target" >&2
+        return 1
+    end
+end
diff --git a/fish/functions/ccx.fish b/fish/functions/ccx.fish
new file mode 100644
index 0000000..7292837
--- /dev/null
+++ b/fish/functions/ccx.fish
@@ -0,0 +1,14 @@
+# Usage: ccx <context> [path]
+function ccx
+    set -l context "$argv[1]"
+    if test -z "$context"
+        printf 'Uso: ccx <contexto> [directorio]\n' >&2
+        return 1
+    end
+
+    set -l resolved (_cortex_resolve_target "$argv[2]"); or return 1
+    begin
+        printf '%s\n' "$context" | _cortex_run_agent "$resolved" claude
+        return $pipestatus[-1]
+    end
+end
diff --git a/fish/functions/imgclip.fish b/fish/functions/imgclip.fish
new file mode 100644
index 0000000..beb595c
--- /dev/null
+++ b/fish/functions/imgclip.fish
@@ -0,0 +1,21 @@
+# Usage: imgclip <image> copies a supported image to the macOS clipboard.
+function imgclip
+    set -l image "$argv[1]"
+
+    if not test -f "$image"
+        printf '❌ Archivo no encontrado: %s\n' "$image"
+        return 1
+    end
+
+    set -l extension (string lower -- (string replace -r '^.*\.' '' -- "$image"))
+    switch "$extension"
+        case png jpg jpeg gif bmp tiff
+            set -l resolved (path resolve "$image")
+            command osascript -e "set the clipboard to (read (POSIX file \"$resolved\") as «class PNGf»)" 2>/dev/null
+            or command osascript -e "set the clipboard to POSIX file \"$resolved\""
+            printf '✓ Imagen copiada al clipboard: %s\n' (command basename "$image")
+        case '*'
+            printf '❌ Formato no soportado: %s\n' "$extension"
+            return 1
+    end
+end
diff --git a/fish/functions/last.fish b/fish/functions/last.fish
new file mode 100644
index 0000000..5a47dab
--- /dev/null
+++ b/fish/functions/last.fish
@@ -0,0 +1,33 @@
+# Usage: last [-c|--copy] [-o|--open] prints, copies, or opens the latest screenshot.
+function last
+    set -l copy false
+    set -l open_file false
+
+    for argument in $argv
+        switch "$argument"
+            case -c --copy
+                set copy true
+            case -o --open
+                set open_file true
+        end
+    end
+
+    set -l directory (_screenshots_dir)
+    set -l files (_screenshot_files)
+    set -l file "$files[1]"
+
+    if test -z "$file"
+        printf '⚠️  No se encontraron screenshots en: %s\n' "$directory"
+        return 1
+    end
+
+    if test "$copy" = true
+        printf '%s\n' "$file" | command pbcopy
+        printf '✓ Path copiado: %s\n' (command basename "$file")
+    else if test "$open_file" = true
+        command open "$file"
+        printf '✓ Abriendo: %s\n' (command basename "$file")
+    else
+        printf '%s\n' "$file"
+    end
+end
diff --git a/fish/functions/oc.fish b/fish/functions/oc.fish
new file mode 100644
index 0000000..c0aaaa0
--- /dev/null
+++ b/fish/functions/oc.fish
@@ -0,0 +1,9 @@
+# Usage: oc [path]
+function oc
+    set -l resolved (_cortex_resolve_target "$argv[1]"); or return 1
+    set -l flags
+    if set -q OPENCODE_DEFAULT_FLAGS; and test -n "$OPENCODE_DEFAULT_FLAGS"
+        set flags (string replace -ra '[[:space:]]+' \n -- "$OPENCODE_DEFAULT_FLAGS")
+    end
+    _cortex_run_agent "$resolved" opencode --auto $flags
+end
diff --git a/fish/functions/ocb.fish b/fish/functions/ocb.fish
new file mode 100644
index 0000000..694b2c3
--- /dev/null
+++ b/fish/functions/ocb.fish
@@ -0,0 +1,4 @@
+# Usage: ocb [path]
+function ocb
+    oc $argv
+end
diff --git a/fish/functions/ss.fish b/fish/functions/ss.fish
new file mode 100644
index 0000000..b0a32e8
--- /dev/null
+++ b/fish/functions/ss.fish
@@ -0,0 +1,27 @@
+# Usage: ss [count] lists the most recent screenshots.
+function ss
+    set -l count "$argv[1]"
+    test -n "$count"; or set count 10
+    set -l directory (_screenshots_dir)
+
+    if not test -d "$directory"
+        printf '⚠️  Directorio no encontrado: %s\n' "$directory"
+        printf '   Configurá SCREENSHOTS_DIR en local/env.zsh\n'
+        return 1
+    end
+
+    printf '\n📸 Últimos %s screenshots en: %s\n\n' "$count" "$directory"
+
+    set -l index 1
+    for file in (_screenshot_files)
+        set -l name (command basename "$file")
+        set -l size (command du -sh "$file" 2>/dev/null | command cut -f1)
+        set -l ago (_time_ago "$file")
+        printf '  [%d] \033[1;37m%s\033[0m \033[90m(%s) — %s\033[0m\n' "$index" "$name" "$size" "$ago"
+
+        set index (math "$index + 1")
+        test "$index" -le "$count"; or break
+    end
+
+    printf '\n  Usá \033[1;33mlast\033[0m para obtener el path del último screenshot\n\n'
+end
diff --git a/fish/functions/ssd.fish b/fish/functions/ssd.fish
new file mode 100644
index 0000000..4de63cd
--- /dev/null
+++ b/fish/functions/ssd.fish
@@ -0,0 +1,10 @@
+# Usage: ssd opens the configured screenshots directory in Finder.
+function ssd
+    set -l directory (_screenshots_dir)
+
+    if test -d "$directory"
+        command open "$directory"
+    else
+        printf '⚠️  Directorio no encontrado: %s\n' "$directory"
+    end
+end
diff --git a/fish/tests/w4b-screenshots.fish b/fish/tests/w4b-screenshots.fish
new file mode 100644
index 0000000..e2a1cd2
--- /dev/null
+++ b/fish/tests/w4b-screenshots.fish
@@ -0,0 +1,160 @@
+#!/usr/bin/env fish
+
+set -l repo_root (cd (dirname (dirname (status filename))); and pwd)
+set -g functions_dir "$repo_root/functions"
+set -g workspace (mktemp -d)
+test -n "$workspace"; or exit 1
+
+function _cleanup_workspace --on-event fish_exit
+    test -d "$workspace"; and rm -rf -- "$workspace"
+end
+
+function fail
+    printf 'FAIL: %s\n' "$argv" >&2
+    exit 1
+end
+
+set -g fish_bin (status fish-path); and test -n "$fish_bin"; or fail 'could not resolve Fish interpreter'
+function assert_equal
+    test "$argv[1]" = "$argv[2]"; or fail "$argv[3] (expected '$argv[2]', got '$argv[1]')"
+end
+
+function assert_contains
+    string match -q "*$argv[2]*" "$argv[1]"; or fail "$argv[3] (missing '$argv[2]')"
+end
+
+function run_function
+    set -l bin_dir "$argv[1]"
+    set -e argv[1]
+    set -l isolated_home "$workspace/home"
+    test -n "$W4B_HOME"; and set isolated_home "$W4B_HOME"
+    env -i HOME="$isolated_home" PATH="$bin_dir:/usr/bin:/bin" \
+        W4B_LOG="$workspace/commands.log" \
+        W4B_SCREENSHOTS_DIR="$W4B_SCREENSHOTS_DIR" \
+        W4B_OSASCRIPT_FAIL_FIRST="$W4B_OSASCRIPT_FAIL_FIRST" \
+        W4B_OSASCRIPT_SEEN="$workspace/osascript.seen" \
+        "$fish_bin" --no-config \
+        -c 'set -gx fish_function_path $argv[1] $fish_function_path; if test -n "$W4B_SCREENSHOTS_DIR"; set -gx SCREENSHOTS_DIR "$W4B_SCREENSHOTS_DIR"; else; set -e SCREENSHOTS_DIR; end; $argv[2] $argv[3..-1]' \
+        "$functions_dir" $argv
+end
+
+set -l fake_bin "$workspace/fake-bin"
+set -l empty_bin "$workspace/empty-bin"
+set -l home "$workspace/home"
+set -l screenshots "$home/Screenshots"
+set -l override "$workspace/override"
+mkdir -p "$fake_bin" "$empty_bin" "$screenshots/nested/deeper" "$override"
+
+printf '%s\n' '#!/bin/sh' 'printf "date|%s\n" "$*" >> "$W4B_LOG"' 'printf "1000\n"' >"$fake_bin/date"
+printf '%s\n' '#!/bin/sh' 'printf "stat" >> "$W4B_LOG"' 'for arg in "$@"; do printf "|%s" "$arg" >> "$W4B_LOG"; done' 'printf "\n" >> "$W4B_LOG"' 'printf "995\n"' >"$fake_bin/stat"
+printf '%s\n' '#!/bin/sh' 'printf "open" >> "$W4B_LOG"' 'for arg in "$@"; do printf "|%s" "$arg" >> "$W4B_LOG"; done' 'printf "\n" >> "$W4B_LOG"' >"$fake_bin/open"
+printf '%s\n' '#!/bin/sh' 'input=$(cat)' 'printf "pbcopy|%s\n" "$input" >> "$W4B_LOG"' >"$fake_bin/pbcopy"
+printf '%s\n' '#!/bin/sh' 'printf "osascript" >> "$W4B_LOG"' 'for arg in "$@"; do printf "|%s" "$arg" >> "$W4B_LOG"; done' 'printf "\n" >> "$W4B_LOG"' 'if [ "$W4B_OSASCRIPT_FAIL_FIRST" = 1 ] && [ ! -e "$W4B_OSASCRIPT_SEEN" ]; then : > "$W4B_OSASCRIPT_SEEN"; exit 1; fi' >"$fake_bin/osascript"
+printf '%s\n' '#!/bin/sh' 'printf "screencapture|%s\n" "$*" >> "$W4B_LOG"' >"$fake_bin/screencapture"
+printf '%s\n' '#!/bin/sh' 'printf "pngpaste|%s\n" "$*" >> "$W4B_LOG"' >"$fake_bin/pngpaste"
+chmod +x "$fake_bin"/*
+
+printf 'old\n' >"$screenshots/older.png"
+printf 'new\n' >"$screenshots/newer.jpg"
+printf 'nested\n' >"$screenshots/nested/latest.gif"
+printf 'deep\n' >"$screenshots/nested/deeper/too-deep.png"
+printf 'ignored\n' >"$screenshots/ignored.txt"
+printf 'override\n' >"$override/override.png"
+/usr/bin/touch -t 202401010101 "$screenshots/older.png"
+/usr/bin/touch -t 202401010102 "$screenshots/newer.jpg"
+/usr/bin/touch -t 202401010103 "$screenshots/nested/latest.gif"
+/usr/bin/touch -t 202401010104 "$screenshots/nested/deeper/too-deep.png"
+/usr/bin/touch -t 202401010105 "$override/override.png"
+
+printf '' >"$workspace/commands.log"
+set -l listed (run_function "$fake_bin" ss 2 | string collect)
+assert_contains "$listed" "Últimos 2 screenshots en: $screenshots" 'ss default directory'
+assert_contains "$listed" latest.gif 'ss includes nested image'
+assert_contains "$listed" newer.jpg 'ss orders recent image'
+assert_contains "$listed" 'justo ahora' 'ss formats recent file age'
+string match -q '*older.png*' "$listed"; and fail 'ss honors count'
+string match -q '*too-deep.png*' "$listed"; and fail 'ss ignores files deeper than two levels'
+assert_contains (string collect <"$workspace/commands.log") "stat|-f|%m|$screenshots/nested/latest.gif" 'ss uses BSD stat arguments'
+
+set -gx W4B_SCREENSHOTS_DIR "$override"
+set listed (run_function "$fake_bin" ss 1 | string collect)
+assert_contains "$listed" "Últimos 1 screenshots en: $override" 'ss override directory'
+assert_contains "$listed" override.png 'ss override image'
+set -e W4B_SCREENSHOTS_DIR
+
+printf '' >"$workspace/commands.log"
+set -l latest (run_function "$fake_bin" last)
+assert_equal "$latest" "$screenshots/nested/latest.gif" 'last returns latest image path'
+
+printf '' >"$workspace/commands.log"
+run_function "$fake_bin" last --copy ignored >/dev/null
+set -l commands (string collect <"$workspace/commands.log")
+assert_contains "$commands" "pbcopy|$screenshots/nested/latest.gif" 'last forwards selected path to pbcopy'
+string match -q '*open|*' "$commands"; and fail 'last copy must not open'
+
+printf '' >"$workspace/commands.log"
+run_function "$fake_bin" last --open >/dev/null
+set commands (string collect <"$workspace/commands.log")
+assert_contains "$commands" "open|$screenshots/nested/latest.gif" 'last forwards selected path to open'
+string match -q '*pbcopy|*' "$commands"; and fail 'last open must not copy'
+
+set -gx W4B_SCREENSHOTS_DIR "$override"
+printf '' >"$workspace/commands.log"
+run_function "$fake_bin" ssd >/dev/null
+set commands (string collect <"$workspace/commands.log")
+assert_equal "$commands" "open|$override" 'ssd opens override directory'
+set -e W4B_SCREENSHOTS_DIR
+
+set -gx W4B_SCREENSHOTS_DIR "$workspace/missing"
+set -l fallback (run_function "$fake_bin" last)
+assert_equal "$fallback" "$screenshots/nested/latest.gif" 'invalid override falls back to default screenshots directory'
+set -e W4B_SCREENSHOTS_DIR
+
+set -gx W4B_HOME "$workspace/no-screen-home"
+mkdir -p "$W4B_HOME"
+if run_function "$fake_bin" ss >"$workspace/missing.out" 2>&1
+    fail 'ss missing default directory must fail'
+end
+assert_contains (string collect <"$workspace/missing.out") "Directorio no encontrado: $W4B_HOME/Desktop" 'ss missing directory error'
+if run_function "$fake_bin" last >"$workspace/last-missing.out" 2>&1
+    fail 'last missing default directory must fail'
+end
+assert_contains (string collect <"$workspace/last-missing.out") "No se encontraron screenshots en: $W4B_HOME/Desktop" 'last missing directory error'
+set -l ssd_missing (run_function "$fake_bin" ssd)
+assert_contains "$ssd_missing" "Directorio no encontrado: $W4B_HOME/Desktop" 'ssd missing directory error'
+mkdir -p "$W4B_HOME/Desktop"
+if run_function "$fake_bin" last >"$workspace/last-empty.out" 2>&1
+    fail 'last empty directory must fail'
+end
+assert_contains (string collect <"$workspace/last-empty.out") "No se encontraron screenshots en: $W4B_HOME/Desktop" 'last empty directory error'
+set -e W4B_HOME
+
+set -l resolved_image (path resolve "$screenshots/newer.jpg")
+printf '' >"$workspace/commands.log"
+run_function "$fake_bin" imgclip "$screenshots/newer.jpg" >/dev/null
+set commands (string collect <"$workspace/commands.log")
+assert_contains "$commands" "osascript|-e|set the clipboard to (read (POSIX file \"$resolved_image\") as «class PNGf»)" 'imgclip forwards resolved image path'
+
+printf '' >"$workspace/commands.log"
+set -gx W4B_OSASCRIPT_FAIL_FIRST 1
+run_function "$fake_bin" imgclip "$screenshots/newer.jpg" >/dev/null
+set commands (string collect <"$workspace/commands.log")
+set -l osascript_calls (string match -ra 'osascript\|' -- "$commands")
+test (count $osascript_calls) -eq 2; or fail 'imgclip falls back after PNG clipboard attempt'
+assert_contains "$commands" "set the clipboard to POSIX file \"$resolved_image\"" 'imgclip fallback arguments'
+set -e W4B_OSASCRIPT_FAIL_FIRST
+
+if run_function "$fake_bin" imgclip "$screenshots/ignored.txt" >"$workspace/unsupported.out" 2>&1
+    fail 'imgclip unsupported format must fail'
+end
+assert_contains (string collect <"$workspace/unsupported.out") 'Formato no soportado: txt' 'imgclip unsupported format error'
+if run_function "$fake_bin" imgclip "$workspace/missing.png" >"$workspace/missing-image.out" 2>&1
+    fail 'imgclip missing file must fail'
+end
+assert_contains (string collect <"$workspace/missing-image.out") "Archivo no encontrado: $workspace/missing.png" 'imgclip missing file error'
+
+set commands (string collect <"$workspace/commands.log")
+string match -q '*screencapture|*' "$commands"; and fail 'helpers must not capture the screen'
+string match -q '*pngpaste|*' "$commands"; and fail 'helpers must not read the clipboard'
+
+printf 'PASS: Fish W4b screenshot helpers\n'
diff --git a/fish/tests/w6-agent-helpers.fish b/fish/tests/w6-agent-helpers.fish
new file mode 100644
index 0000000..9874454
--- /dev/null
+++ b/fish/tests/w6-agent-helpers.fish
@@ -0,0 +1,139 @@
+#!/usr/bin/env fish
+
+set -l repo_root (cd (dirname (dirname (status filename))); and pwd)
+set -g functions_dir "$repo_root/functions"
+set -g workspace (mktemp -d)
+test -n "$workspace"; or exit 1
+function _cleanup_w6 --on-event fish_exit
+    test -d "$workspace"; and rm -rf -- "$workspace"
+end
+function fail
+    printf 'FAIL: %s\n' "$argv" >&2
+    exit 1
+end
+set -g fish_bin (status fish-path); and test -n "$fish_bin"; or fail 'could not resolve Fish interpreter'
+function contains
+    string match -q "*$argv[2]*" -- "$argv[1]"; or fail "$argv[3]"
+end
+
+set -g home "$workspace/home"
+set -g bin "$workspace/bin"
+set -g repo "$workspace/repo"
+set -g target "$workspace/target dir"
+set -g workspace_dir "$workspace/workspace dir"
+mkdir -p "$home/dev" "$bin" "$repo" "$target" "$workspace_dir/sub dir"
+printf '#!/bin/sh\nprintf "claude|%%s|cwd=%%s|stdin=" "$*" "$PWD" >> "$W6_LOG"\nwhile IFS= read -r line; do printf "%%s\\n" "$line" >> "$W6_LOG"; done\nprintf "\\n" >> "$W6_LOG"\nexit "${W6_CLAUDE_STATUS:-0}"\n' > "$bin/claude"
+printf '#!/bin/sh\nprintf "opencode|%%s|cwd=%%s\\n" "$*" "$PWD" >> "$W6_LOG"\nexit "${W6_OPENCODE_STATUS:-0}"\n' > "$bin/opencode"
+printf '#!/bin/sh\nprintf "pbcopy|" >> "$W6_LOG"\nwhile IFS= read -r line; do printf "%%s\\n" "$line" >> "$W6_LOG"; done\nprintf "\\n" >> "$W6_LOG"\nexit "${W6_PBCOPY_STATUS:-0}"\n' > "$bin/pbcopy"
+printf '#!/bin/sh\nfor file; do while IFS= read -r line || [ -n "$line" ]; do printf "%%s\\n" "$line"; done < "$file"; done\n' > "$bin/cat"
+printf '%s\n' '#!/bin/sh' 'for file; do' '  case "$file" in -*) continue ;; esac' '  i=0' '  while IFS= read -r line || [ -n "$line" ]; do' '    i=$((i + 1))' '    printf "%6s\\t%s\\n" "$i" "$line"' '  done < "$file"' 'done' > "$bin/nl"
+chmod +x "$bin"/*
+printf 'alpha\n' > "$target/code file.fish"
+printf 'beta\n' > "$target/other.txt"
+printf '' > "$target/empty.txt"
+
+function run_w6
+    env -i HOME="$home" PATH="$bin:/usr/bin:/bin" W6_LOG="$workspace/log" \
+        W6_CLAUDE_STATUS="$W6_CLAUDE_STATUS" W6_OPENCODE_STATUS="$W6_OPENCODE_STATUS" W6_PBCOPY_STATUS="$W6_PBCOPY_STATUS" OPENCODE_DEFAULT_FLAGS="$OPENCODE_DEFAULT_FLAGS" WORKSPACE_DIR="$WORKSPACE_DIR" \
+        "$fish_bin" --no-config -c 'set -gx fish_function_path $argv[1] $fish_function_path; cd "$argv[2]"; and $argv[3] $argv[4..-1]' \
+        "$functions_dir" "$repo" $argv
+end
+function run_w6_unavailable
+    env -i HOME="$home" PATH="/usr/bin:/bin" "$fish_bin" --no-config \
+        -c 'set -gx fish_function_path $argv[1] $fish_function_path; cd "$argv[2]"; and $argv[3] $argv[4..-1]' \
+        "$functions_dir" "$repo" $argv
+end
+
+printf '' > "$workspace/log"
+run_w6 cc; or fail 'cc must use the current directory without arguments'
+string match -q -- "claude|--dangerously-skip-permissions|cwd=$repo|stdin=" (string collect <"$workspace/log"); or fail 'cc default command order'
+printf '' > "$workspace/log"
+run_w6 cc "$target"; or fail 'cc must succeed'
+set -l log (string collect <"$workspace/log")
+string match -q -- "claude|--dangerously-skip-permissions|cwd=$target|stdin=" "$log"; or fail 'cc target command order'
+
+printf '' > "$workspace/log"
+run_w6 oc "$target"; or fail 'oc must succeed without defaults'
+string match -q -- "opencode|--auto|cwd=$target" (string collect <"$workspace/log"); or fail 'oc default command order'
+printf '' > "$workspace/log"
+set -gx OPENCODE_DEFAULT_FLAGS (printf '%s\t%s\n%s' --model test --plain | string collect --no-trim-newlines)
+run_w6 oc "$target"; or fail 'oc must tokenize shell whitespace in defaults'
+string match -q -- "opencode|--auto --model test --plain|cwd=$target" (string collect <"$workspace/log"); or fail 'oc tokenizes defaults after one auto flag'
+set -gx OPENCODE_DEFAULT_FLAGS '--model test --plain'
+printf '' > "$workspace/log"
+run_w6 ocb "$target"; or fail 'ocb must succeed'
+string match -q -- "opencode|--auto --model test --plain|cwd=$target" (string collect <"$workspace/log"); or fail 'ocb forwards defaults after one auto flag'
+set -e OPENCODE_DEFAULT_FLAGS
+set -gx W6_OPENCODE_STATUS 24
+run_w6 oc "$target" >/dev/null 2>&1; and fail 'opencode status must propagate'
+set -e W6_OPENCODE_STATUS
+
+printf '' > "$workspace/log"
+run_w6 ccx 'initial context with spaces' "$target"; or fail 'ccx must succeed'
+contains (string collect <"$workspace/log") "claude||cwd=$target|stdin=initial context with spaces" 'ccx forwards context through stdin'
+if run_w6 ccx >"$workspace/ccx.out" 2>&1
+    fail 'ccx without context must fail'
+end
+contains (string collect <"$workspace/ccx.out") 'Uso: ccx' 'ccx usage'
+
+if run_w6 cc "$workspace/missing" >"$workspace/missing.out" 2>&1
+    fail 'missing agent target must fail'
+end
+contains (string collect <"$workspace/missing.out") 'Directorio no encontrado' 'missing target error'
+set -gx W6_CLAUDE_STATUS 23
+run_w6 cc "$target" >/dev/null 2>&1; and fail 'claude status must propagate'
+set -e W6_CLAUDE_STATUS
+set -gx W6_CLAUDE_STATUS 25
+run_w6 ccx context "$target" >/dev/null 2>&1; and fail 'ccx status must propagate'
+set -e W6_CLAUDE_STATUS
+if run_w6_unavailable cc "$target" >"$workspace/unavailable.out" 2>&1
+    fail 'unavailable claude must fail'
+end
+contains (string collect <"$workspace/unavailable.out") 'claude' 'unavailable claude identifies command'
+
+set -gx WORKSPACE_DIR ''
+set -l ccd_default (run_w6 ccd)
+contains "$ccd_default" "Navegando a: $home/dev" 'ccd default directory'
+set -gx WORKSPACE_DIR "$workspace_dir"
+set -l ccd_output (run_w6 ccd 'sub dir')
+contains "$ccd_output" "Navegando a: $workspace_dir/sub dir" 'ccd uses workspace override'
+source "$functions_dir/ccd.fish"
+cd "$repo"
+ccd 'sub dir' >/dev/null; or fail 'ccd must change the invoking Fish process directory'
+test "$PWD" = "$workspace_dir/sub dir"; or fail 'ccd persists PWD in the invoking Fish process'
+if run_w6 ccd missing >"$workspace/ccd.out" 2>&1
+    fail 'ccd missing directory must fail'
+end
+contains (string collect <"$workspace/ccd.out") 'Directorio no encontrado' 'ccd validates target'
+set -e WORKSPACE_DIR
+
+printf '' > "$workspace/log"
+run_w6 ccclip "$target/code file.fish" -n; or fail 'ccclip must copy content'
+set log (string collect <"$workspace/log")
+contains "$log" "pbcopy|```fish" 'ccclip fences extension'
+contains "$log" "// File: $target/code file.fish" 'ccclip preserves spaced path'
+contains "$log" '1	alpha' 'ccclip includes line numbers'
+printf '' > "$workspace/log"
+run_w6 ccclip "$target/code file.fish"; or fail 'ccclip must copy newline-terminated content'
+set log (string collect <"$workspace/log")
+set -l expected_fence (string join \n alpha '```' | string collect)
+contains "$log" "$expected_fence" 'ccclip trims trailing linefeeds before the closing fence'
+printf '' > "$workspace/log"
+run_w6 ccclip "$target/empty.txt"; or fail 'ccclip must copy empty files'
+printf '' > "$workspace/log"
+run_w6 ccclip "$workspace/missing"; or fail 'ccclip empty context preserves successful clipboard status'
+contains (string collect <"$workspace/log") 'pbcopy|' 'ccclip hands empty context to clipboard'
+set -gx W6_PBCOPY_STATUS 31
+run_w6 ccclip "$target/other.txt" >/dev/null 2>&1; and fail 'clipboard failure must propagate'
+set -e W6_PBCOPY_STATUS
+if run_w6 ccclip >"$workspace/clip.out" 2>&1
+    fail 'ccclip without files must fail'
+end
+contains (string collect <"$workspace/clip.out") 'Uso: ccclip' 'ccclip usage'
+
+for file in "$functions_dir/_cortex_resolve_target.fish" "$functions_dir/_cortex_run_agent.fish" "$functions_dir/ocb.fish" "$functions_dir/ccx.fish" "$functions_dir/ccd.fish" "$functions_dir/ccclip.fish"
+    set -l source (string collect < "$file")
+    string match -rqi -- '(dangerously-skip-permissions|bypass-permissions|skip-permissions|auto-approv|--yes)' "$source"; and fail "unexpected unsafe W6 source: $file"
+end
+
+printf 'PASS: Fish W6 agent helpers\n'
diff --git a/nix/home.nix b/nix/home.nix
index 95e223c..c4b0cb9 100644
--- a/nix/home.nix
+++ b/nix/home.nix
@@ -67,5 +67,20 @@
     "fish/functions/sshc.fish".source = ../fish/functions/sshc.fish;
     "fish/functions/sshx.fish".source = ../fish/functions/sshx.fish;
     "fish/functions/sshx-doctor.fish".source = ../fish/functions/sshx-doctor.fish;
+    "fish/functions/_screenshots_dir.fish".source = ../fish/functions/_screenshots_dir.fish;
+    "fish/functions/_screenshot_files.fish".source = ../fish/functions/_screenshot_files.fish;
+    "fish/functions/_time_ago.fish".source = ../fish/functions/_time_ago.fish;
+    "fish/functions/ss.fish".source = ../fish/functions/ss.fish;
+    "fish/functions/last.fish".source = ../fish/functions/last.fish;
+    "fish/functions/ssd.fish".source = ../fish/functions/ssd.fish;
+    "fish/functions/imgclip.fish".source = ../fish/functions/imgclip.fish;
+    "fish/functions/_cortex_resolve_target.fish".source = ../fish/functions/_cortex_resolve_target.fish;
+    "fish/functions/_cortex_run_agent.fish".source = ../fish/functions/_cortex_run_agent.fish;
+    "fish/functions/cc.fish".source = ../fish/functions/cc.fish;
+    "fish/functions/oc.fish".source = ../fish/functions/oc.fish;
+    "fish/functions/ocb.fish".source = ../fish/functions/ocb.fish;
+    "fish/functions/ccx.fish".source = ../fish/functions/ccx.fish;
+    "fish/functions/ccd.fish".source = ../fish/functions/ccd.fish;
+    "fish/functions/ccclip.fish".source = ../fish/functions/ccclip.fish;
   };
 }