Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Agy Headless Bridge

MCP server that runs Google's Antigravity CLI (agy) headlessly inside a pseudo-terminal and returns its cleaned output to Claude Code.

Compatibility: Not stated.

Grade C

One Medium finding. Read the findings before installing.

Graded by PlugVetRubric v2

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

Rescanned at commit 8a7f1b0133af, unchanged since the check below.

PERMISSION_SHELL_UNDECLARED

Why this grade

  • PERMISSION_SHELL_UNDECLARED Medium

    Runs shell commands that the manifest or description does not mention.

    src/agy_headless_bridge/bridge.py, line 11 plain `subprocess.run(["agy", "-p", prompt])` returns an empty string - which

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

    Concern

    requests shell access. No manifest field names shell or command execution.

    PERMISSION_SHELL_UNDECLARED

    src/agy_headless_bridge/bridge.py, line 11

    plain `subprocess.run(["agy", "-p", prompt])` returns an empty string - which

    src/agy_headless_bridge/bridge.py, line 26

    * POSIX : the stdlib `pty` module (`os.openpty` + `subprocess.Popen`).

    src/agy_headless_bridge/bridge.py, line 346

    proc = subprocess.Popen(

    Show more

    README.md, line 59

    r = subprocess.run(["agy", "-p", "say hi"], capture_output=True, text=True)

    README.md, line 120

    | **Linux / macOS** | stdlib [`pty`] (`os.openpty` + `subprocess.Popen`) | ⚠️ pty mechanics verified on Linux CI; real `agy` round-trip **not yet verified on POSIX hardware** |

  • Install and update

    Pass

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

  • Network

    Pass

    No network call found.

  • Secrets

    Concern

    reads a credential or environment file.

    SECRETS_PATH_UNCONFIRMED

    .gitignore, line 9

    venv/

  • Agent instructions

    Pass

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

  • Obfuscation

    Pass

    No encoded or minified payload found.

  • 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 8a7f1b0133af. requests shell access. No manifest field names shell or command execution. reads a credential or environment file.

Date and source

Date checked:

View source

github.com

Commit graded: 8a7f1b0133af16b4bddbd50d5a1f7cf32337242e

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