AI-agent-friendly command-line toolkit: timestamp/date conversion, JWT decoding, port killing, file finding, and directory trees — headless, --json, with a self-describing manifest and a built-in MCP server (mfn mcp).

Meet the Socket team at Black Hat in Las Vegas, August 3-6

@master4n/master-cli

master4novice

master-cli

An ambiguous license classifier was found.

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Ambiguous License Classifier

Source files are encoded using a non-standard text encoding.

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Bad text encoding

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Bad semver

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Bad dependency semver

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Bidirectional unicode control characters

This package has multiple bin scripts with the same name. This can cause non-deterministic behavior when installing or could be a sign of a supply chain attack.

What is bin script confusion?

Bin script confusion

This Chrome extension includes content scripts that execute JavaScript on specified websites.

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Chrome: Content Script

This Chrome extension requests host permissions to access specific websites or domains.

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Chrome: Host Permission

This Chrome extension requests permissions to access browser APIs, user data, or system features.

What are Chrome extension permissions?

Chrome: Permission

This Chrome extension requests wildcard host permissions that grant broad access to websites.

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Chrome: Wildcard Host Permission

Semantic versions published out of chronological order.

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Chronological version anomaly

Project maintainer's SSH key has been compromised.

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Compromised SSH key

What do I need to know about license files?

Copyleft License

Contains a Critical Common Vulnerability and Exposure (CVE).

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Title

Critical CVE

Contains a high severity Common Vulnerability and Exposure (CVE).

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High CVE

Uses debug, reflection and dynamic code execution features.

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Debug access

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Deprecated

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Deprecated SPDX exception

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Deprecated license

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Possible typosquat attack

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Dynamic require

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Environment variable access

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Name

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File dependency

Accesses the file system, and could potentially read sensitive data.

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Filesystem access

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Wildcard dependency

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Alert title

Generic alert

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What are GitHub Actions taint flows?

GitHub Actions: Input argument exported as environment variable

An input argument to this GitHub Action is being passed back as an output. If a user of this action passes untrusted input, it could be used in an insecure manner by consuming workflows.

GitHub Actions: Input argument passed back as output

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GitHub Actions: Input argument flows to dangerous sink

A GitHub context variable (such as issue title, PR description, or comment body) is being exported as an environment variable. These context values are user-controlled and could be exploited by subsequent workflow steps.

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A GitHub context variable (such as issue title, PR description, or comment body) flows into a dangerous sink (such as shell command execution). This is a critical security issue that could allow command injection or code execution attacks.

GitHub Actions: GitHub context variable flows to dangerous sink

An environment variable flows into a dangerous sink (such as shell command execution). If this environment variable comes from an untrusted source, it could be exploited to inject commands.

GitHub Actions: Environment variable flows to dangerous sink

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What are git dependencies?

Git dependency

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What are GitHub dependencies?

GitHub dependency

AI has identified unusual behaviors that may pose a security risk.

What is an AI-detected potential code anomaly?

AI-detected potential code anomaly

AI has identified this package as a potential typosquat of a more popular package. This suggests that the package may be intentionally mimicking another package's name, description, or other metadata.

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AI-detected possible typosquat

AI has identified this package as malware. This is a strong signal that the package may be malicious.

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AI-detected potential malware

AI has determined that this package may contain potential security issues or vulnerabilities.

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AI-detected potential security risk

Contains native code (e.g., compiled binaries or shared libraries). Including native code can obscure malicious behavior.

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Native code

Contains high entropy strings. This could be a sign of encrypted data, leaked secrets or obfuscated code.

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High entropy strings

Contains unicode homoglyphs which can be used in supply chain confusion attacks.

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Unicode homoglyphs

Contains a dependency which resolves to a remote HTTP URL which could be used to inject untrusted code and reduce overall package reliability.

What are http dependencies?

HTTP dependency

Install scripts are run when the package is installed or built. Malicious packages often use scripts that run automatically to execute payloads or fetch additional code.

What is an install script?

Install scripts

Package has an invalid manifest file and can cause installation problems if you try to use it.

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Invalid manifest file

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Invisible chars

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License change

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License exception

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License Policy Violation

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Long strings

Package has recently undergone a major refactor. It may be unstable or indicate significant internal changes. Use caution when updating to versions that include significant changes.

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Major refactor

This package version is identified as malware. It has been flagged either by Socket's AI scanner and confirmed by our threat research team, or is listed as malicious in security databases and other sources.

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Known malware

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Manifest confusion

Contains a medium severity Common Vulnerability and Exposure (CVE).

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Medium CVE

Contains a low severity Common Vulnerability and Exposure (CVE).

What is a mild CVE?

Low CVE

This package contains minified code. This may be harmless in some cases where minified code is included in packaged libraries, however packages on npm should not minify code.

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Minified code

A package's licensing information has fine-grained problems.

Misc. License Issues

The package was published by an npm account that no longer exists.

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Non-existent author

A required dependency is not declared in package.json and may prevent the package from working.

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Missing dependency

Package does not have a license and consumption legal status is unknown.

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Missing license

A manifest file was found without a corresponding lockfile. Without a lockfile, dependency resolution is non-deterministic and may resolve to different (potentially malicious) versions across installs.

Why are lockfiles important?

Missing lockfile

This package is missing its tarball. It could be removed from the npm registry or there may have been an error when publishing.

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Missing package tarball

What is a mixed license?

Mixed license

Package contains a modified version of an SPDX license exception. Please read carefully before using this code.

What is a modified license exception?

Modified license exception

Package contains a modified version of an SPDX license. Please read carefully before using this code.

		@@ -19,3 +19,3 @@ # @master4n/master-cli (`mfn`)
		concurrently (a slow `wait` never blocks `ping`). Client config:
		`{ "command": "npx", "args": ["-y", "@master4n/master-cli", "mcp"] }`.
		`{ "command": "npx", "args": ["-y", "@master4n/master-cli@latest", "mcp"] }`.
		`mfn mcp --json` describes the server without starting it.
		@@ -22,0 +22,0 @@ - Machine output: pass `--json`, OR just pipe the command (when stdout is not

		{
		"name": "@master4n/master-cli",
		"version": "3.0.5",
		"version": "3.0.6",
		"description": "AI-agent-friendly command-line toolkit: timestamp/date conversion, JWT decoding, port killing, file finding, and directory trees — headless, --json, with a self-describing manifest and a built-in MCP server (mfn mcp).",
		@@ -5,0 +5,0 @@ "type": "module",

		@@ -67,3 +67,3 @@ # @master4n/master-cli (`mfn`)
		"mcpServers": {
		"mfn": { "command": "npx", "args": ["-y", "@master4n/master-cli", "mcp"] }
		"mfn": { "command": "npx", "args": ["-y", "@master4n/master-cli@latest", "mcp"] }
		}
		@@ -79,2 +79,12 @@ }

		An [Agent Skill](./skills/mfn/SKILL.md) ships at `skills/mfn/SKILL.md` — a
		portable SKILL.md (YAML frontmatter + usage guide) that teaches any coding
		agent (Claude Code, Roo, Cline, …) the full command catalog, output contract,
		recipes, and gotchas. `.claude/skills/mfn` symlinks to it so Claude Code
		auto-discovers it in this repo; point other agents at the file directly.

		This repo ships a [`.mcp.json`](./.mcp.json) with exactly this wiring, so
		cloning it gives Claude Code (and any client honouring project-scope MCP
		config) the `mfn` server automatically.

		## Quick start
		@@ -81,0 +91,0 @@

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