Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Mcp Nats

Mcp Nats, an MCP server listed in the PlugVet directory.

Compatibility: Not stated.

Grade C

One Medium finding. Read the report 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_UNDECLARED

Why this grade

  • PERMISSION_SHELL_UNDECLARED Medium

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

    cmd/mcp-nats/transport_integration_test.go, line 29 build := exec.Command("go", "build", "-o", out, ".")

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

    cmd/mcp-nats/transport_integration_test.go, line 29

    build := exec.Command("go", "build", "-o", out, ".")

    cmd/mcp-nats/transport_integration_test.go, line 151

    cmd := exec.CommandContext(cmdCtx, bin,

    cmd/mcp-nats/transport_integration_test.go, line 202

    cmd := exec.CommandContext(cmdCtx, bin,

    Show more

    tools/common/nats.go, line 194

    cmd := exec.Command("nats", args...)

  • Install and update

    Pass

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

  • Network

    Pass

    No network call found.

  • Secrets

    Note

    reads an environment variable.

    SECRETS_ENV_READ

    tools/common/nats.go, line 262

    password := os.Getenv("NATS_PASSWORD")

  • Agent instructions

    Pass

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

  • Obfuscation

    Concern

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

    OBFUSCATION_ENCODED_BLOB

    README.md, line 2

    [![Install MCP Server](https://cursor.com/deeplink/mcp-install-dark.svg)](https://cursor.com/en/install-mcp?name=NATS&config=eyJjb21tYW5kIjoiZG9ja2VyIHJ1biAtaSAtLXJtIC0taW5pdCAtZSB

  • 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 669f19e8f616. requests shell access. No manifest field names shell or command execution. reads an environment variable. contains an encoded blob in a file that should be readable.

Date and source

Date checked:

View source

github.com

Commit graded: 669f19e8f616a6aed40671a55add8db5a7e8beee

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