Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Mcp N8N Workflow Builder

Mcp N8N Workflow Builder, an MCP server listed in the PlugVet directory.

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 ba48196ba4d0, unchanged since the check below.

PERMISSION_DELETE_FILES INSTALL_UNPINNED NETWORK_NO_FIXED_HOST NETWORK_UNNAMED_HOST SECRETS_PATH_DOTENV INSTALL_DOCUMENTED_INSTALLER SECRETS_ENV_READ

Why this grade

  • PERMISSION_DELETE_FILES Low

    Contains a call that can delete files.

    _bmad/scripts/render_skill.py, line 319 shutil.rmtree(staging, ignore_errors=True)

  • INSTALL_UNPINNED Low

    Dependencies use a range or git URL with no lockfile.

    docs/getting-started/installation/npm-installation.md, line 336 curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.0/install.sh | bash

  • NETWORK_NO_FIXED_HOST Low

    Makes a network call whose host is not written as a fixed address.

    cleanup-test-tags.js, line 14 const response = await axios.post(mcpServerUrl, {

  • NETWORK_UNNAMED_HOST Low

    Calls a fixed host that the description does not name.

    cleanup-test-tags.js, line 14 const response = await axios.post(mcpServerUrl, {

  • SECRETS_PATH_DOTENV Low

    Mentions a .env file.

    src/index.ts, line 3 // Load environment variables from .env file

  • INSTALL_DOCUMENTED_INSTALLER Note

    Documentation shows an installer that pipes a download into a shell.

    docs/getting-started/installation/npm-installation.md, line 336 curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.0/install.sh | bash

  • SECRETS_ENV_READ Note

    Reads an environment variable whose name contains KEY, SECRET, TOKEN, PASSWORD or CREDENTIAL.

    test-credentials-all-methods-direct.js, line 25 n8nApiKey: process.env.N8N_API_KEY

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

    _bmad/scripts/render_skill.py, line 319

    shutil.rmtree(staging, ignore_errors=True)

    docs/api/resources-prompts.md, line 588

    prompt_result = subprocess.run(

    docs/api/resources-prompts.md, line 614

    create_result = subprocess.run(

    Show more

    docs/api/tags-api.md, line 157

    result = subprocess.run(

    docs/api/workflows-api.md, line 362

    result = subprocess.run(

    docs/stories/epic-7/story-7.2-workflows-api-reference.md, line 370

    result = subprocess.run(

  • Install and update

    Concern

    dependencies are not pinned. The docs document an installer that pipes a download into a shell.

    INSTALL_UNPINNED INSTALL_DOCUMENTED_INSTALLER

    docs/getting-started/installation/npm-installation.md, line 336

    curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.0/install.sh | bash

    package.json, line 24

    @modelcontextprotocol/sdk

  • Network

    Concern

    can reach a host that is not written as a fixed address. can reach staging.app.n8n.cloud. The description does not name that host.

    NETWORK_NO_FIXED_HOST NETWORK_UNNAMED_HOST

    cleanup-test-tags.js, line 14

    const response = await axios.post(mcpServerUrl, {

    cleanup-validtest-tags.js, line 9

    const response = await axios.post(mcpServerUrl, {

    debug-tags.js, line 9

    const response = await axios.post(mcpServerUrl, {

    Show more

    test-check-tags.js, line 4

    const response = await axios.post('http://localhost:3456/mcp', {

    test-comprehensive.js, line 32

    const req = http.request(options, (res) => {

    test-comprehensive.js, line 81

    http.get(`http://${HOST}:${PORT}/health`, (res) => {

    test-create-tag-simple.js, line 4

    const response = await axios.post('http://localhost:3456/mcp', {

    test-credentials-api-direct.js, line 34

    const response = await axios.get(`${config.n8nHost}/api/v1/credentials`, {

    test-credentials-create.js, line 38

    const response = await axios.post(config.mcpServerUrl, {

    test-credentials-create.js, line 75

    const response = await axios.get(config.healthCheckUrl);

    test-debug-response.js, line 4

    const response = await axios.post('http://localhost:3456/mcp', {

    docs/n8n-api-docs/20-EXECUTIONS-API.md, line 106

    const response = await axios.get('https://n8n.example.com/api/v1/executions', {

    docs/n8n-api-docs/20-EXECUTIONS-API.md, line 289

    const response = await axios.get(`https://n8n.example.com/api/v1/executions/${executionId}`, {

    docs/n8n-api-docs/20-EXECUTIONS-API.md, line 951

    const response = await axios.get('https://n8n.example.com/api/v1/executions', {

    docs/n8n-api-docs/20-EXECUTIONS-API.md, line 1005

    const listResponse = await axios.get('https://n8n.example.com/api/v1/executions', {

    docs/n8n-api-docs/20-EXECUTIONS-API.md, line 1093

    const response = await axios.get('https://n8n.example.com/api/v1/executions', {

  • Secrets

    Concern

    reads a credential or environment file.

    SECRETS_ENV_READ SECRETS_PATH_DOTENV

    test-credentials-all-methods-direct.js, line 25

    n8nApiKey: process.env.N8N_API_KEY

    test-credentials-api-direct.js, line 25

    n8nApiKey: process.env.N8N_API_KEY

    src/index.ts, line 3

    // Load environment variables from .env file

    Show more

    test-credentials-delete-and-schema.js, line 116

    n8nApiKey: process.env.N8N_API_KEY

    test-credentials-delete-validation.js, line 25

    n8nApiKey: process.env.N8N_API_KEY

    test-credentials-get-by-id-direct.js, line 25

    n8nApiKey: process.env.N8N_API_KEY

    src/config/configLoader.ts, line 20

    * Load configuration from .config.json or .env (fallback)

    src/config/configLoader.ts, line 54

    // Fallback to .env for backward compatibility

    src/config/configLoader.ts, line 56

    console.error(`[ConfigLoader] No .config.json found, falling back to .env`);

    src/config/configLoader.ts, line 111

    * Load configuration from .env (backward compatibility)

    src/config/configLoader.ts, line 114

    // Load .env file from multiple possible locations

    src/config/configLoader.ts, line 116

    path.join(process.cwd(), '.env'),

    src/config/configLoader.ts, line 117

    path.join(__dirname, '../../.env'), // Relative to build/config/configLoader.js

    src/config/configLoader.ts, line 131

    const n8nApiKey = process.env.N8N_API_KEY;

    src/config/constants.ts, line 2

    export const N8N_API_KEY = process.env.N8N_API_KEY || '';

  • 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.

Get the full report on this tool, £49

Note

Hygiene check of commit ba48196ba4d0. can delete files. dependencies are not pinned. The docs document an installer that pipes a download into a shell. can reach a host that is not written as a fixed address. can reach staging.app.n8n.cloud. The description does not name that host. reads a credential or environment file.

Date and source

Date checked:

View source

github.com

Commit graded: ba48196ba4d06e67dafe1b1200628a40d764f73b

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