Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Screaming Frog Mcp

A headless MCP (Model Context Protocol) server for Screaming Frog SEO Spider.

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.

Rescanned at commit e6bbd37e239c, unchanged since the check below.

PERMISSION_DELETE_FILES INSTALL_UNPINNED SECRETS_PATH_DOTENV OBFUSCATION_FILE_OVER_READ_CAP

Why this grade

  • PERMISSION_DELETE_FILES Low

    Contains a call that can delete files.

    src/screaming_frog_mcp/server.py, line 177 result = subprocess.run(

  • INSTALL_UNPINNED Low

    Dependencies use a range or git URL with no lockfile.

    requirements.txt, line 1 mcp>=1.26.0

  • SECRETS_PATH_DOTENV Low

    Mentions a .env file.

    .gitignore, line 1 .env

  • 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

    Concern

    can delete files.

    PERMISSION_DELETE_FILES

    src/screaming_frog_mcp/server.py, line 177

    result = subprocess.run(

    src/screaming_frog_mcp/server.py, line 209

    shutil.rmtree(path, ignore_errors=True)

    src/screaming_frog_mcp/server.py, line 220

    shutil.rmtree(d, ignore_errors=True)

    Show more

    src/screaming_frog_mcp/server.py, line 304

    shutil.rmtree(log_dir, ignore_errors=True)

    src/screaming_frog_mcp/server.py, line 315

    shutil.rmtree(output_dir, ignore_errors=True)

    src/screaming_frog_mcp/server.py, line 386

    result = subprocess.run(

    src/screaming_frog_mcp/server.py, line 517

    shutil.rmtree(output_dir, ignore_errors=True)

    src/screaming_frog_mcp/server.py, line 668

    result = subprocess.run(

    src/screaming_frog_mcp/server.py, line 1273

    result = subprocess.run(

    CHANGELOG.md, line 115

    - Added `encoding='utf-8', errors='replace'` to all `subprocess.run` calls so non-ASCII CLI output is handled safely on any locale

  • Install and update

    Concern

    dependencies are not pinned.

    INSTALL_UNPINNED

    requirements.txt, line 1

    mcp>=1.26.0

  • Network

    Pass

    No network call found.

  • Secrets

    Concern

    reads a credential or environment file.

    SECRETS_PATH_DOTENV

    src/screaming_frog_mcp/server.py, line 381

    return "ERROR: Screaming Frog CLI not found. Check SF_CLI_PATH in .env."

    src/screaming_frog_mcp/server.py, line 437

    return "ERROR: Screaming Frog CLI not found. Check SF_CLI_PATH in .env."

    .gitignore, line 1

    .env

    Show more

    src/screaming_frog_mcp/server.py, line 662

    return "ERROR: Screaming Frog CLI not found. Check SF_CLI_PATH in .env."

    src/screaming_frog_mcp/server.py, line 735

    return "ERROR: Screaming Frog CLI not found. Check SF_CLI_PATH in .env."

    src/screaming_frog_mcp/server.py, line 1263

    return "ERROR: Screaming Frog CLI not found. Check SF_CLI_PATH in .env."

    README.md, line 96

    If you cloned the repo, copy `.env.example` to `.env` and edit it.

    README.md, line 237

    | CLI not found | Check that `SF_CLI_PATH` in `.env` points to the correct executable |

  • 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.

Get the full report on this tool, £49

Note

Hygiene check of commit e6bbd37e239c. can delete files. dependencies are not pinned. reads a credential or environment file. a file was over the read cap and was not fully read.

Date and source

Date checked:

View source

github.com

Commit graded: e6bbd37e239cbd558f4e632b9ae7fb522dba439a

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