Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Datacron

Local MCP server to query and maintain a Markdown vault from Claude, Codex, Gemini, or another stdio MCP client, without sending the whole vault into the context.

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

Why this grade

  • AGENT_IGNORE_INSTRUCTIONS High

    Text tells the agent to ignore earlier instructions.

    src/datacron/mcp/sandbox.py, line 25 (``Ignore previous instructions``) by replacing them with

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

    Concern

    can delete files.

    PERMISSION_DELETE_FILES

    packaging/windows/build_installer.py, line 79

    completed = subprocess.run( # noqa: S603

    packaging/windows/build_installer.py, line 152

    completed = subprocess.run(command, cwd=_REPO_ROOT, check=False) # noqa: S603

    scripts/check_invariants.py, line 87

    completed = subprocess.run(command, cwd=_REPO_ROOT, check=False) # noqa: S603

    Show more

    scripts/ci_scope.py, line 97

    result = subprocess.run( # noqa: S603 - resolved executable and validated commit hashes

    scripts/release_preflight.py, line 76

    completed: subprocess.CompletedProcess[str] = subprocess.run( # noqa: S603

    scripts/smoke_released_binary.py, line 93

    indexed = subprocess.run( # noqa: S603 - the executable is a resolved argument

    scripts/verify_windows_install.py, line 157

    completed = subprocess.run( # noqa: S603 - fixed interpreter, path from this process

    scripts/verify_windows_install.py, line 200

    return subprocess.run( # noqa: S603 - hash-verified candidate on a disposable host

    src/datacron/setup_wizard.py, line 441

    shutil.rmtree(index)

    src/datacron/organization/library_workbench.py, line 378

    shutil.rmtree(output, ignore_errors=True)

  • Install and update

    Pass

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

  • Network

    Concern

    can reach a host that is not written as a fixed address.

    NETWORK_NO_FIXED_HOST

    scripts/mcp_registry_publish.sh, line 88

    for required_command in curl jq sha256sum tar mktemp; do

    scripts/mcp_registry_publish.sh, line 129

    curl \

    scripts/mcp_registry_publish.sh, line 175

    log "PyPI version is not available yet (HTTP ${HTTP_STATUS}, curl ${CURL_EXIT})."

    Show more

    scripts/mcp_registry_publish.sh, line 178

    fail "PyPI check failed (HTTP ${HTTP_STATUS}, curl ${CURL_EXIT})."

    scripts/mcp_registry_publish.sh, line 228

    fail "Registry pre-check failed (HTTP ${HTTP_STATUS}, curl ${CURL_EXIT})."

    scripts/mcp_registry_publish.sh, line 239

    curl \

    src/datacron/companion/ui.py, line 545

    const res = await fetch(path, {

  • Secrets

    Concern

    reads a credential or environment file.

    SECRETS_PATH_DOTENV

    src/datacron/core/config.py, line 14

    """Runtime configuration loaded from environment variables and ``.env``.

    src/datacron/core/config.py, line 1121

    No ``.env`` file is read. One used to be, from the current working

    src/datacron/core/config.py, line 1123

    opened: a cloned repository's ``.env`` could set

    Show more

    .gitignore, line 55

    # Secrets

    .gitignore, line 56

    .env

    .gitignore, line 57

    .env.local

    CHANGELOG.md, line 630

    - Settings were also read from a `.env` file in the working directory, which for a stdio

    CHANGELOG.md, line 632

    or move the log directory. No `.env` file is read any more; set `DATACRON_*` variables in

  • Agent instructions

    Serious

    instructions tell the agent to ignore earlier instructions.

    AGENT_IGNORE_INSTRUCTIONS

    src/datacron/mcp/sandbox.py, line 25

    (``Ignore previous instructions``) by replacing them with

  • 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

    tests/unit/mcp/test_tools.py, line 1

    # Copyright 2026 Julien Bombled

  • 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 25d2b322fcf0. can delete files. can reach a host that is not written as a fixed address. reads a credential or environment file. instructions tell the agent to ignore earlier instructions. a file was over the read cap and was not fully read.

Date and source

Date checked:

View source

github.com

Commit graded: 25d2b322fcf02ded6d26c0ac3f53bf655c554d31

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