A bridge that lets an AI coding agent use String to connect to apps, web pages, and shell sessions through one interface.

Connecting the agent to supported apps, browsing web content as Markdown, running shell sessions, and troubleshooting failed actions.

It avoids switching between separate tools and gives the agent a guided way to install apps, run actions, read web pages, and recover from errors.

string-os — Plugin by string-os

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Claude Code

/plugin marketplace add string-os/string

agentmods

npx agentmods add plugins/string-os/string/marketplace

Clone the repo

git clone --depth 1 https://github.com/string-os/string

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

string-os scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude-plugin/marketplace.json · 28 lines

What it actually says

{
  "name": "string-os",
  "owner": {
    "name": "string-os",
    "url": "https://github.com/string-os"
  },
  "metadata": {
    "description": "String — a universal surface for AI agent work. String apps, web pages, and shell sessions through one MCP tool.",
    "version": "0.1.15"
  },
  "plugins": [
    {
      "name": "string",
      "source": "./",
      "description": "The String runtime as a Claude Code plugin. Installs the `string` MCP server (via npx — no manual install) and a skill that walks Claude through installing apps, calling actions, browsing pages as markdown, and recovering from errors.",
      "version": "0.1.15",
      "author": {
        "name": "H1R AI",
        "url": "https://h1r.ai"
      },
      "homepage": "https://string-os.org",
      "license": "MIT",
      "keywords": ["mcp", "sfmd", "markdown", "agent", "runtime", "apps"],
      "category": "workflow"
    }
  ]
}

Files

What ships with it

1 file beside marketplace.json in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

plugin.json 624 B

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2d ago First seen · 28 lines scan A d226f67db963

Subscribe to this mod's changes

string-os is a plugin published in the GitHub repository string-os/string (65 stars, last pushed 13d ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Data and AI Debugging LLM Writing and docs agent-runtime agent-skills ai-agents cli commonmark

string-os

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What ships with it

What this file has done since we first saw it

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