sigistry/marketplace · plugins/mcp-server-smith/skills/mcp-server-security/SKILL.md

mcp-server-security skillA

mcp-server-security is agent-read markdown (skill) from sigistry/marketplace: This skill should be used when the user mentions "MCP security", "MCP server security", "prompt injection", "tool poisoning", "confused deputy", "token passthrough", "MCP threat model", "command injection", "SSRF", "rate limiting MCP", "MCP CORS", or hardening a Model Context Protocol server against attack. It provides the MCP threat model and per-risk mitigations..

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add sigistry/marketplace/mcp-server-security@git:20260826.571bc2f
Exact content
mdr add sigistry/marketplace/mcp-server-security@sha256:d4d43ccf758af0c0

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_lv6gbzoufiwzg5wy.svg)](https://markdownregistry.com/a/art_lv6gbzoufiwzg5wy)

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Versions

versioncommittedcommitsizeaudit
git:20260826.571bc2f latest2026-08-26 571bc2f 5,225 BA view · diff
git:20260802.9f9bd442026-08-02 9f9bd44 5,225 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (5225 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

sigistry/marketplace · 3 stars · license MIT · pushed 2026-09-15 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_lv6gbzoufiwzg5wy
GET https://markdownregistry.com/api/v1/resolve?ref=sigistry/marketplace/mcp-server-security
GET https://markdownregistry.com/api/v1/blob/d4d43ccf758af0c04f014f440e5e24d42792d6249ba5ae896d8b0b92f3682669

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.