Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Fastmcp Ts

The TypeScript framework for building Model Context Protocol servers, clients, and apps.

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 1baebca834ec.

NETWORK_NO_FIXED_HOST NETWORK_UNNAMED_HOST SECRETS_PATH_DOTENV SECRETS_ENV_READ OBFUSCATION_FILE_OVER_READ_CAP OBFUSCATION_FILE_CAP_REACHED

Why this grade

  • NETWORK_NO_FIXED_HOST Low

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

    src/client/auth.ts, line 720 const response = await fetch(this._tokenEndpoint, {

  • NETWORK_UNNAMED_HOST Low

    Calls a fixed host that the description does not name.

    src/client/auth.ts, line 720 const response = await fetch(this._tokenEndpoint, {

  • SECRETS_PATH_DOTENV Low

    Mentions a .env file.

    src/client/transports.ts, line 117 this.env = options?.env

  • SECRETS_ENV_READ Note

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

    src/server/FastMCP.ts, line 420 const raw = process.env['FASTMCP_CLI_AUTH_TOKEN']

  • OBFUSCATION_FILE_OVER_READ_CAP Note

    A file was over the read cap and was not fully read.

    package-lock.json, line 1 {

  • OBFUSCATION_FILE_CAP_REACHED Note

    The 400 file cap was reached before every file was read.

    package-lock.json, line 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

    Pass

    No shell or command execution found, and no extra permission was declared.

  • 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. can reach api.internal. The description does not name that host.

    NETWORK_NO_FIXED_HOST NETWORK_UNNAMED_HOST

    src/client/auth.ts, line 720

    const response = await fetch(this._tokenEndpoint, {

    src/client/auth.ts, line 855

    return fetch(url, { ...init, body: body.toString() })

    src/client/transports.ts, line 198

    return fetch(url, {

    Show more

    src/server/FastMCP.ts, line 105

    * values throw here, at construction, for every transport. `fetch()` is

    src/server/FastMCP.ts, line 201

    * This option does not apply to `fetch()`, which has no bind address from which

    src/server/FastMCP.ts, line 202

    * to infer a trusted host. A framework embedding `fetch()` owns Host/Origin

    src/server/FastMCP.ts, line 256

    * startup, like `stateless`) and never served through `fetch()`.

    src/server/FastMCP.ts, line 1440

    * Routes never serve on stdio or through `fetch()` — a framework embedding

  • Secrets

    Concern

    reads a credential or environment file.

    SECRETS_ENV_READ SECRETS_PATH_DOTENV

    src/server/FastMCP.ts, line 420

    const raw = process.env['FASTMCP_CLI_AUTH_TOKEN']

    src/cli/commands/run.ts, line 39

    env: { ...process.env, ...buildEntrypointEnv(spec), ...env },

    src/client/transports.ts, line 117

    this.env = options?.env

    Show more

    .gitignore, line 15

    .env

  • 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. the file cap was reached before every file was read.

    OBFUSCATION_FILE_OVER_READ_CAP OBFUSCATION_FILE_CAP_REACHED

    package-lock.json, line 1

    {

    tests/client/client.test.ts, line 1

    import { describe, it, expect, afterEach } from 'vitest'

  • Licence

    Note

    no licence file found.

    LICENCE_MISSING

  • Maintainer activity

    Pass

    The latest commit is within the last 365 days.

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Note

Hygiene check of commit 1baebca834ec. can reach a host that is not written as a fixed address. can reach api.internal. The description does not name that host. reads a credential or environment file. a file was over the read cap and was not fully read. the file cap was reached before every file was read. no licence file found.

Date and source

Date checked:

View source

github.com

Commit graded: 1baebca834ec4e95dbb115dccbadf68214051403

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