diff --git a/.gitignore b/.gitignore
index 6b1add2..55cd582 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,6 +11,7 @@ cheerfy_pentest_report.md
 # Backups y temporales
 *.bak
 *.tmp
+__pycache__/
 
 # Archivos de auth del CLI de Codex/OpenAI
 .codex
diff --git a/changedetection/docker-compose.yml b/changedetection/docker-compose.yml
index 74b9b9c..bd81e00 100644
--- a/changedetection/docker-compose.yml
+++ b/changedetection/docker-compose.yml
@@ -39,5 +39,7 @@ services:
 networks:
   changedetection_internal:
     driver: bridge
+    labels:
+      prune.protect: "true"
   proxy:
     external: true
diff --git a/finance/docker-compose.yml b/finance/docker-compose.yml
index acdb2d9..ccd3f80 100644
--- a/finance/docker-compose.yml
+++ b/finance/docker-compose.yml
@@ -25,5 +25,7 @@ services:
 networks:
   finance_internal:
     driver: bridge
+    labels:
+      prune.protect: "true"
   proxy:
     external: true
diff --git a/guacamole/docker-compose.yml b/guacamole/docker-compose.yml
index 1d66b13..5290a57 100644
--- a/guacamole/docker-compose.yml
+++ b/guacamole/docker-compose.yml
@@ -66,5 +66,7 @@ services:
 networks:
   guacamole:
     driver: bridge
+    labels:
+      prune.protect: "true"
   proxy:
     external: true
diff --git a/it/Dockerfile b/it/Dockerfile
new file mode 100644
index 0000000..73b81ad
--- /dev/null
+++ b/it/Dockerfile
@@ -0,0 +1,8 @@
+ARG IT_TOOLS_BASE_IMAGE=ghcr.io/corentinth/it-tools:latest
+FROM ${IT_TOOLS_BASE_IMAGE}
+
+RUN set -eu; \
+    asset="$(find /usr/share/nginx/html/assets -name 'ascii-text-drawer-*.js' -print -quit)"; \
+    test -n "$asset"; \
+    sed -i 's#fontPath:"//unpkg.com/figlet@1.6.0/fonts/"#fontPath:"https://unpkg.com/figlet@1.6.0/fonts"#g' "$asset"; \
+    grep -q 'fontPath:"https://unpkg.com/figlet@1.6.0/fonts"' "$asset"
diff --git a/it/README.md b/it/README.md
index 2857d2e..3d3742c 100644
--- a/it/README.md
+++ b/it/README.md
@@ -11,6 +11,11 @@ Coleccion de herramientas tecnicas self-hosted.
 
 ```bash
 docker compose --env-file .env config
+docker compose --env-file .env build
 docker compose --env-file .env up -d
 docker compose --env-file .env logs -f
 ```
+
+El `Dockerfile` aplica un parche local para el generador de ASCII art: corrige
+la URL de fuentes FIGlet que en la imagen upstream termina cargando
+`fonts//Standard.flf` y falla en navegador por CORS.
diff --git a/it/docker-compose.yml b/it/docker-compose.yml
index 5641afa..7e8cc36 100644
--- a/it/docker-compose.yml
+++ b/it/docker-compose.yml
@@ -1,5 +1,9 @@
 services:
   it-tools:
+    build:
+      context: .
+      args:
+        IT_TOOLS_BASE_IMAGE: ${IT_TOOLS_BASE_IMAGE:-ghcr.io/corentinth/it-tools:latest}
     image: ${IT_TOOLS_IMAGE}
     container_name: it-tools
     restart: unless-stopped
@@ -21,5 +25,7 @@ services:
 networks:
   it_internal:
     driver: bridge
+    labels:
+      prune.protect: "true"
   proxy:
     external: true
diff --git a/pdf/docker-compose.yml b/pdf/docker-compose.yml
index 023acff..c00da38 100644
--- a/pdf/docker-compose.yml
+++ b/pdf/docker-compose.yml
@@ -30,5 +30,7 @@ services:
 networks:
   pdf_internal:
     driver: bridge
+    labels:
+      prune.protect: "true"
   proxy:
     external: true
diff --git a/scripts/prune-safe.py b/scripts/prune-safe.py
new file mode 100755
index 0000000..bc8f796
--- /dev/null
+++ b/scripts/prune-safe.py
@@ -0,0 +1,178 @@
+#!/usr/bin/env python3
+"""Careful Docker pruning for this compose/Sablier host.
+
+The important guardrail is that networks are not pruned by default. Sablier
+keeps some containers intentionally stopped, and deleting their compose-created
+networks can leave those stopped containers unable to start later.
+"""
+
+from __future__ import annotations
+
+import argparse
+import json
+import subprocess
+import sys
+from dataclasses import dataclass
+
+
+PROTECT_LABEL = "prune.protect"
+PROTECT_VALUE = "true"
+NETWORK_NEVER_REMOVE = {"bridge", "host", "none", "proxy", "mail_internal"}
+
+
+@dataclass
+class DockerObject:
+    id: str
+    name: str
+    labels: dict[str, str]
+    state: str = ""
+
+    @property
+    def protected(self) -> bool:
+        return self.labels.get(PROTECT_LABEL, "").lower() == PROTECT_VALUE
+
+
+def docker(args: list[str], *, check: bool = True) -> str:
+    result = subprocess.run(
+        ["docker", *args],
+        check=False,
+        text=True,
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+    )
+    if check and result.returncode != 0:
+        sys.stderr.write(result.stderr)
+        raise SystemExit(result.returncode)
+    return result.stdout
+
+
+def parse_labels(raw: str | None) -> dict[str, str]:
+    labels: dict[str, str] = {}
+    if not raw:
+        return labels
+    for item in raw.split(","):
+        if not item:
+            continue
+        key, sep, value = item.partition("=")
+        labels[key] = value if sep else ""
+    return labels
+
+
+def list_containers() -> list[DockerObject]:
+    rows = docker(["container", "ls", "-a", "--format", "{{json .}}"]).splitlines()
+    containers: list[DockerObject] = []
+    for row in rows:
+        data = json.loads(row)
+        containers.append(
+            DockerObject(
+                id=data["ID"],
+                name=data["Names"],
+                labels=parse_labels(data.get("Labels")),
+                state=data.get("State", ""),
+            )
+        )
+    return containers
+
+
+def list_networks() -> list[DockerObject]:
+    rows = docker(["network", "ls", "--format", "{{json .}}"]).splitlines()
+    networks: list[DockerObject] = []
+    for row in rows:
+        data = json.loads(row)
+        networks.append(
+            DockerObject(
+                id=data["ID"],
+                name=data["Name"],
+                labels=parse_labels(data.get("Labels")),
+            )
+        )
+    return networks
+
+
+def network_has_containers(network_id: str) -> bool:
+    raw = docker(["network", "inspect", network_id, "--format", "{{json .Containers}}"])
+    containers = json.loads(raw)
+    return bool(containers)
+
+
+def remove_containers(dry_run: bool) -> int:
+    removable_states = {"created", "exited", "dead"}
+    candidates = [
+        c
+        for c in list_containers()
+        if c.state.lower() in removable_states and not c.protected
+    ]
+    if not candidates:
+        print("containers: none")
+        return 0
+    print("containers:")
+    for container in candidates:
+        print(f"  remove {container.name} ({container.state})")
+        if not dry_run:
+            docker(["container", "rm", container.id])
+    return len(candidates)
+
+
+def prune_images(dry_run: bool) -> None:
+    cmd = ["image", "prune", "-af", "--filter", f"label!={PROTECT_LABEL}={PROTECT_VALUE}"]
+    print("images:")
+    if dry_run:
+        print("  would run: docker " + " ".join(cmd))
+        return
+    print(docker(cmd).rstrip() or "  none")
+
+
+def prune_build_cache(dry_run: bool) -> None:
+    cmd = ["builder", "prune", "-af"]
+    print("builder-cache:")
+    if dry_run:
+        print("  would run: docker " + " ".join(cmd))
+        return
+    print(docker(cmd).rstrip() or "  none")
+
+
+def prune_networks(dry_run: bool) -> int:
+    candidates: list[DockerObject] = []
+    for network in list_networks():
+        if network.name in NETWORK_NEVER_REMOVE or network.protected:
+            continue
+        if network_has_containers(network.id):
+            continue
+        candidates.append(network)
+
+    if not candidates:
+        print("networks: none")
+        return 0
+
+    print("networks:")
+    for network in candidates:
+        print(f"  remove {network.name}")
+        if not dry_run:
+            docker(["network", "rm", network.id])
+    return len(candidates)
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--dry-run", action="store_true", help="show what would be removed")
+    parser.add_argument(
+        "--prune-networks",
+        action="store_true",
+        help="also remove unused, unprotected networks",
+    )
+    args = parser.parse_args()
+
+    print(f"mode: {'dry-run' if args.dry_run else 'execute'}")
+    removed_containers = remove_containers(args.dry_run)
+    prune_images(args.dry_run)
+    prune_build_cache(args.dry_run)
+    if args.prune_networks:
+        prune_networks(args.dry_run)
+    else:
+        print("networks: skipped")
+    print(f"summary: removable_containers={removed_containers}")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/scripts/prune-safe.sh b/scripts/prune-safe.sh
index 1acf112..8d24829 100755
--- a/scripts/prune-safe.sh
+++ b/scripts/prune-safe.sh
@@ -1,4 +1,10 @@
 #!/usr/bin/env sh
 set -eu
 
-docker system prune -af --filter "label!=prune.protect=true"
+SCRIPT_PATH="$0"
+if command -v readlink >/dev/null 2>&1; then
+  SCRIPT_PATH="$(readlink -f "$0")"
+fi
+SCRIPT_DIR="$(dirname "$SCRIPT_PATH")"
+
+exec python3 "$SCRIPT_DIR/prune-safe.py" "$@"