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    Claude CodeClaude CodeCursorCursorCodex CLICodex CLIMuseMuseOpenClawOpenClaw+21 more

    CodeGuardian: Anti Hallucination & Code Integrity Shield

    1

    Prevents AI assistants from deleting code or truncating files by enforcing strict, line-by-line diff patches.

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    CodeGuardian: Anti Hallucination & Code Integrity Shield

    CodeGuardian: Anti Hallucination & Code Integrity Shield

    Example session with this skill installed

    Add error handling to the fetch_user function in api_client.py without changing anything else.

    • Read your context and instructions
    • Compiled the codeguardian

    🔍 CODE INTEGRITY VERIFIED. ENFORCING DIFF OUTPUT ONLY.

    I have analyzed api_client.py. To prevent file truncation and protect your existing imports and helper functions, I am applying a precise diff patch to the fetch_user method.

    Logic Integrity Patch

    
# [FILE]: api_client.py
# [SCOPE]: fetch_user method
# [STATUS]: Verified - No silent deletions detected.

# [REMOVE LINE]:     response = requests.get(f"{self.base_url}/users/{user_id}")
# [REMOVE LINE]:     return response.json()
# [ADD LINE]:     try:
# [ADD LINE]:         response = requests.get(f"{self.base_url}/users/{user_id}", timeout=10)
# [ADD LINE]:         response.raise_for_status()
# [ADD LINE]:         return response.json()
# [ADD LINE]:     except requests.exceptions.RequestException as e:
# [ADD LINE]:         logger.error(f"Failed to fetch user {user_id}: {e}")
# [ADD LINE]:         return None

    Next steps

    1. Run pytest tests/test_api_client.py to confirm the new exception handling works as expected.
    2. Verify that the logger import at the top of the file remains intact.
    3. Check that the timeout value aligns with your internal SLA requirements.

    Connects securely to your tools. The creator never sees your data.

    About this skill

    AI coding assistants often overwrite working code, introduce silent regressions, or provide lazy placeholders that break builds. This skill acts as a strict quality gate, forcing line-by-line diffs and protecting existing logic from accidental deletion.

    What it does

    • Diff enforcement isolates changes to specific lines to prevent full-file rewrites and potential corruption.
    • Regression blocking programmatically checks that imports, helpers, and telemetry logs are not deleted during edits.
    • Placeholder banning detects and stops the use of lazy comments like "rest of code remains the same" that truncate files.
    • Integrity verification validates the logic profile before any file system write operation occurs.

    How it works

    1. The skill intercepts the request to modify a file and scans the existing structure.
    2. It identifies the target lines for modification while locking the surrounding code.
    3. It generates a strict 4-block layout using [REMOVE LINE] and [ADD LINE] markers.
    4. It performs a final check to ensure no unauthorized deletions occurred before committing changes.

    Frameworks & tools

    This skill is designed for use with Claude Code, Cursor, and other AI IDEs. It operates at the filesystem level and is language-agnostic, supporting Python, JavaScript, Go, and enterprise-scale scripts.

    Why this beats prompting it yourself

    Generic prompts often fail when context windows get crowded, leading to truncated files. This skill provides a rigid execution policy that treats silent deletions as critical failures, ensuring production code remains intact during refactors.

    Use cases

    • Patching specific methods in 1000+ line legacy files without risk of truncation.
    • Adding logging or telemetry to sensitive production scripts.
    • Refactoring internal logic while preserving complex import blocks and comments.

    Known limitations

    Requires file system access to inspect line lengths. Works best on localized edits rather than total architectural migrations.

    How to install

    Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.

    ~30 seconds
    1. 1

      Download the ZIP

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    2. 2

      Unzip into your skills folder

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    3. 3

      Ask your agent to use it

      Restart the agent if it was already running. It picks the skill up automatically - no config needed.

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