File Writer Skill

Quick Start

• Base directory: /home/alfred/.openclaw/workspace/scratch. All paths relative to this (e.g., "notes.txt" or "subdir/log.md").
• Sanitize: Reject if path contains '../', starts with '/', or has non-text extensions (allow only .txt, .md, .log, .json).
• Primary tools: 'write' for saving, 'read' for checks/backups, 'exec' for mkdir -p (fallback to message if unavailable).
• Mode: Write (default/overwrite with backup), append (if specified).

Step-by-Step Workflow

1. Parse query: Extract rel_path (e.g., "subdir/notes.txt"), content, mode (write/append; infer from phrases like "update" = write).
• If missing (e.g., "write that information"), use message to ask for rel_path/content.
2. Sanitize: Validate rel_path (no escapes, safe extension). Compute full_path = base_dir + rel_path.
3. Create subdirs if needed: Extract parent from rel_path; call 'exec'("mkdir -p [base_dir]/[parent]") or message: "Please run mkdir -p [full_parent] and confirm."
4. Check existence (call 'read' on full_path):
• If exists and write mode: Create backup (read content, find unique .bak.N path, 'write' to it).
• Confirm overwrite/append: Use message ("Confirm [action] on [file]? Yes/No").
5. Execute:
• Write: 'write' full_path with content.
• Append: 'read' existing, concatenate content, 'write' back.
6. Handle errors: Reply with details; log via message ("Wrote [bytes] to [full_path] at [timestamp]").
7. If tools fail, fallback: Message requesting user runs echo "[content]" > [full_path] or >> for append.

Safety Guidelines

• Limits: Max 50k chars; reject binary/large.
• Backups: Always for overwrites; increment .bak.N until unique (e.g., check with 'read').
• Sensitive paths: If contains 'secret' or 'key', double-confirm.
• No auto-mkdir if exec unavailable: Require user confirmation/action.
• See references/safety.md for patterns.

Edge Cases

• Empty content: Reject with "Content required."
• Non-existent for append: Treat as write.
• Existing .bak: Increment (e.g., .bak.1, .bak.2; use loop with 'read' to find next).
• Invalid path: "Invalid: Must be relative text file in scratch."
• Large content: Reject or chunk (multiple writes if over limit).

Bundled Resources

• scripts/backup_file.sh: Fallback Bash for creating backups if tools limited.
• references/safety.md: Sanitization and confirmation patterns.