Refined tool return error codes.

Now they all return with exit 0 and error messages instead.
This prevents early query abortion on fatal errors.

1 files changed, 32 insertions, 4 deletions

diff --git a/tools/fs_cat.sh b/tools/fs_cat.sh
index 9fcf702..d02ca21 100755
--- a/tools/fs_cat.sh
+++ b/tools/fs_cat.sh
@@ -1,15 +1,43 @@
 #!/usr/bin/env bash
-set -e
+set -uo pipefail
 
 # @describe Read the contents of a file at the specified path.
 # Use this when you need to examine the contents of an existing file.
-
 # @option --path! The path of the file to read
-
 # @env LLM_OUTPUT=/dev/stdout The output path
 
+OUT="${LLM_OUTPUT:-/dev/stdout}"
+MAX_BYTES="${LLM_MAX_BYTES:-200000}"
+
+sanitize() {
+  if command -v iconv >/dev/null 2>&1; then
+    iconv -f UTF-8 -t UTF-8 -c
+  else
+    cat
+  fi
+}
+
+err() {
+  echo "ERROR: $*" >> "$OUT"
+  exit 0
+}
+
 main() {
-    cat "$argc_path" >> "$LLM_OUTPUT"
+  path="${argc_path:-}"
+  [[ -z "$path" ]] && err "missing --path"
+  [[ ! -e "$path" ]] && err "file not found: $path"
+  [[ ! -f "$path" ]] && err "not a regular file: $path"
+  [[ ! -r "$path" ]] && err "file not readable: $path"
+
+  # Heuristik: Binärdateien nicht in den Chat kippen
+  if LC_ALL=C grep -qP '\x00' "$path" 2>/dev/null; then
+    err "file appears to be binary (NUL bytes detected): $path"
+  fi
+
+  head -c "$MAX_BYTES" "$path" | sanitize >> "$OUT"
+  exit 0
 }
 
 eval "$(argc --argc-eval "$0" "$@")"
+main
+