diff --git a/assets/functions/tools/fs_read.sh b/assets/functions/tools/fs_read.sh
new file mode 100644
index 0000000..d7ab331
--- /dev/null
+++ b/assets/functions/tools/fs_read.sh
@@ -0,0 +1,62 @@
+#!/usr/bin/env bash
+set -e
+
+# @describe Read a file with line numbers, offset, and limit. For directories, lists entries.
+# Prefer this over fs_cat for controlled reading. Use offset/limit to read specific sections.
+# Use the grep tool to find specific content before reading, then read with offset to target the relevant section.
+
+# @option --path! The absolute path to the file or directory to read
+# @option --offset The line number to start reading from (1-indexed, default: 1)
+# @option --limit The maximum number of lines to read (default: 2000)
+
+# @env LLM_OUTPUT=/dev/stdout The output path
+
+MAX_LINE_LENGTH=2000
+MAX_BYTES=51200
+
+main() {
+    # shellcheck disable=SC2154
+    local target="$argc_path"
+    local offset="${argc_offset:-1}"
+    local limit="${argc_limit:-2000}"
+
+    if [[ ! -e "$target" ]]; then
+        echo "Error: path not found: $target" >> "$LLM_OUTPUT"
+        return 1
+    fi
+
+    if [[ -d "$target" ]]; then
+        ls -1 "$target" >> "$LLM_OUTPUT" 2>&1
+        return 0
+    fi
+
+    local total_lines file_bytes
+    total_lines=$(wc -l < "$target" 2>/dev/null || echo 0)
+    file_bytes=$(wc -c < "$target" 2>/dev/null || echo 0)
+
+    if [[ "$file_bytes" -gt "$MAX_BYTES" ]] && [[ "$offset" -eq 1 ]] && [[ "$limit" -ge 2000 ]]; then
+        {
+            echo "Warning: Large file (${file_bytes} bytes, ${total_lines} lines). Showing first ${limit} lines."
+            echo "Use --offset and --limit to read specific sections, or use the grep tool to find relevant lines first."
+            echo ""
+        } >> "$LLM_OUTPUT"
+    fi
+
+    local end_line=$((offset + limit - 1))
+
+    sed -n "${offset},${end_line}p" "$target" 2>/dev/null | {
+        local line_num=$offset
+        while IFS= read -r line; do
+            if [[ ${#line} -gt $MAX_LINE_LENGTH ]]; then
+                line="${line:0:$MAX_LINE_LENGTH}... (truncated)"
+            fi
+            printf "%d: %s\n" "$line_num" "$line"
+            line_num=$((line_num + 1))
+        done
+    } >> "$LLM_OUTPUT"
+
+    if [[ "$end_line" -lt "$total_lines" ]]; then
+        echo "" >> "$LLM_OUTPUT"
+        echo "(${total_lines} total lines. Use --offset $((end_line + 1)) to read more.)" >> "$LLM_OUTPUT"
+    fi
+}