install_skill_from_markdown · Friday MCP Server MCP

WHAT IT DOES

What install_skill_from_markdown does on Friday MCP Server

AI agents invoke install_skill_from_markdown to trigger actions in Friday MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why install_skill_from_markdown needs a policy

Installing a skill from markdown effectively executes or registers new code/capabilities into the running MCP server. This is a self-extension mechanism that could introduce arbitrary execution logic. The blast radius is critical because a malicious or misconfigured skill could compromise the entire server environment, execute arbitrary commands, or exfiltrate data.

From the tool's definition 'Install a skill from markdown front matter and instructions' — installs executable skill code/logic into the MCP server, enabling arbitrary capability extension

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

install_skill_from_markdown Rate-limited

install_skill_from_markdown stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "install_skill_from_markdown": {
      "limits": [
        {
          "counter": "install_skill_from_markdown_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Friday MCP Server, so you can run agents against it safely.

FAQ

Questions about install_skill_from_markdown

What does the install_skill_from_markdown tool do? +

Install a skill from markdown front matter and instructions. It is categorised as a Execute tool in the Friday MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on install_skill_from_markdown? +

Register the Friday MCP Server MCP server in PolicyLayer and add a rule for install_skill_from_markdown: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Friday MCP Server. Nothing to install.

What risk level is install_skill_from_markdown? +

install_skill_from_markdown is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit install_skill_from_markdown? +

Yes. Add a rate_limit block to the install_skill_from_markdown rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block install_skill_from_markdown completely? +

Set action: deny in the PolicyLayer policy for install_skill_from_markdown. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides install_skill_from_markdown? +

install_skill_from_markdown is provided by the Friday MCP Server MCP server (jeremylakeyjr/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.