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once

v0.1.0

Adds Once execution-safety tools for consequential AI-agent writes, ambiguous outcomes and safe retries.

Claude Code1 MCP serverstdio

By OnceLicense: MIT0 GitHub starsUpdated 1 hour ago

Directory evidence

Runtimes
Claude Code
Parsed components
1 skill or MCP entry
Source updated
Sep 24, 2026
Manifest status
Canonical path parsed

The directory validates manifest shape and source location. It does not execute the plugin or provide a security endorsement. Review the indexing methodology →

Install once for Claude Code

Installs for the current user
claude plugin marketplace add IchenDEV/agent-plugin-mkt
claude plugin marketplace update agent-plugin-marketplace
claude plugin install once@agent-plugin-marketplace

Paste and run these commands in a terminal with Claude Code. They add and refresh the PluginsMP catalog, then install this plugin.

The installer fetches third-party code from the source repository shown on this page. This directory validates manifest structure and source location, but does not perform a security audit; review the manifest, components, and source before installing.

Get the source manually
git clone https://github.com/stringsofthemind-oss/once

Clone the source repository, then follow its setup instructions to add the plugin to a compatible client. The plugin root is plugins/claude-code/once/.

Plugin files

plugins/claude-code/once/
├── .claude-plugin/plugin.json
└── .mcp.json

MCP servers1

oncestdio
command
node
args
${CLAUDE_PLUGIN_ROOT}/scripts/once-mcp.cjs

MCP configuration uses runtime-provided plugin path placeholders such as ${PLUGIN_ROOT} or ${CLAUDE_PLUGIN_ROOT}. Review the manifest for the runtime-specific expansion rules.

Plugin manifests1

plugins/claude-code/once/.claude-plugin/plugin.json
{
  "name": "once",
  "version": "0.1.0",
  "description": "Adds Once execution-safety tools for consequential AI-agent writes, ambiguous outcomes and safe retries.",
  "author": {
    "name": "Once"
  },
  "homepage": "https://onceexec.com/claude-code-mcp-safe-retries/",
  "repository": "https://github.com/stringsofthemind-oss/once",
  "license": "MIT"
}

For maintainers

If you maintain this plugin, link to this source-backed listing from your README so users can review its manifest and indexed components.

[once on Agent Plugins Marketplace](https://pluginsmp.com/plugins/once)