Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add rules/tecnomanu/agent-rules-kit/03-file-operationsgit clone --depth 1 https://github.com/tecnomanu/agent-rules-kitWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00439 | $0.00439 |
| Opus 5 | $0.00219 | $0.00219 |
| Sonnet 5 | $0.00088 | $0.00088 |
| Haiku 4.5 | $0.00044 | $0.00044 |
Grade C, and why
03-file-operations scanned grade C with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Hidden instructionshighPrompt injection
Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.
<!-- In the future: or using the translations system --> How it starts
The opening of the file, as written. The whole thing — 69 lines — stays where its author put it; the contents beside it link to each section on GitHub.
File Operations Guidelines
These guidelines apply to all file operations in the Agent Rules Kit project. !Important: Al the system and files most be in english
File Creation and Modification
- Before creating a file, check if it already exists to avoid duplication
- When modifying existing files, preserve the original formatting and style
- If a file exists and there is no explicit instruction to overwrite, merge content instead of replacing
- Ensure all new files have appropriate permissions
- Add file headers with description and copyright information where applicable
Template Files
- Template files in the
templates/directory should:- Use clear, descriptive names
- Include meaningful comments
- Provide examples for customization
- Follow the established naming patterns
- Use proper file extensions
Rule Files Structure
- All rule files should follow a consistent structure:
- Title at the top
- Brief description of purpose
- Sections with clear headings
- Code examples where appropriate
- Version compatibility information if relevant
Path Handling
- Use path manipulation utilities (like Node.js
pathmodule) instead of string concatenation - Handle both relative and absolute paths correctly
- Use platform-appropriate path separators
- Normalize paths when comparing or storing them
- Validate paths before file operations
File I/O
- Use asynchronous file operations when possible
- Properly handle file operation errors
- Close file handles after use
- Use appropriate encoding for text files (UTF-8 preferred)
- Implement proper error recovery for file operations
Configuration Files
- Keep configuration files in standard formats (JSON, YAML, etc.)
- Validate configuration files against schemas
- Provide sensible defaults
- Document all configuration options
- Use environment variables for sensitive information
Version Control Considerations
- Don't track generated files in version control
- Add appropriate entries to .gitignore
- Consider using .gitattributes for handling line endings
- Backup important files before destructive operations
- Ensure file timestamps are preserved when appropriate
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 3d ago First seen · 69 lines · 439 tokens per session scan C 96773d3f9303
03-file-operations is a cursor rule published in the GitHub repository tecnomanu/agent-rules-kit (35 stars, last pushed 11mo ago), licensed ISC. It adds 439 tokens to every session, about $0.0022 per session on Opus 5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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