Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Helios Mcp

A behavioral genome for AI agents. Helios is a Model Context Protocol (MCP) server that represents an agent's personality as probability distributions, measures how far observed behavior drifts from the declared profile using a Dirichlet posterior and Jensen-Shannon divergenc

Compatibility: Not stated.

Grade B

Minor issues only, no Medium or High. Worth a quick look at the findings below before installing.

Graded by PlugVetRubric v2

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

PERMISSION_SHELL_DECLARED OBFUSCATION_FILE_OVER_READ_CAP

Why this grade

  • PERMISSION_SHELL_DECLARED Note

    Runs shell commands, and the manifest or description says so.

    helios-plugin/hooks/hook-handler.py, line 228 subprocess.Popen(

  • OBFUSCATION_FILE_OVER_READ_CAP Note

    A file was over the read cap and was not fully read.

    uv.lock, line 1 version = 1

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.

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

    Note

    requests shell access. The manifest names this permission.

    PERMISSION_SHELL_DECLARED

    helios-plugin/hooks/hook-handler.py, line 228

    subprocess.Popen(

    helios-plugin/hooks/hook-handler.py, line 241

    subprocess.run(

    src/helios_mcp/atomic_ops.py, line 97

    has_identity = subprocess.run(

    Show more

    src/helios_mcp/atomic_ops.py, line 105

    return subprocess.run(

    src/helios_mcp/llm.py, line 118

    proc = subprocess.run(

  • 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

    Pass

    No instruction to ignore earlier instructions or to hide a step.

  • Obfuscation

    Note

    a file was over the read cap and was not fully read.

    OBFUSCATION_FILE_OVER_READ_CAP

    uv.lock, line 1

    version = 1

  • Licence

    Pass

    A licence file is present (LICENSE).

  • Maintainer activity

    Pass

    The latest commit is within the last 365 days.

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Note

Hygiene check of commit c43b0fcd45c1. requests shell access. The manifest names this permission. a file was over the read cap and was not fully read.

Date and source

Date checked:

View source

github.com

Commit graded: c43b0fcd45c16df777661634b880501fdf31bf7f

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Read how this letter is chosen