Add Tandem Workflow Architect

Author: tacshade

.agents/plugins/marketplace.json

@@ -335,6 +335,21 @@
       "category": "Development & Workflow",
       "description": "Hook-powered test generation -- detects files changed during an agent turn and instructs Codex to write and run tests automatically. Zero config, 8 languages."
     },
+    {
+      "name": "tandem-codex-plugin",
+      "displayName": "Tandem Workflow Architect",
+      "source": {
+        "source": "local",
+        "path": "./plugins/frumu-ai/tandem-codex-plugin"
+      },
+      "policy": {
+        "installation": "AVAILABLE",
+        "authentication": "ON_INSTALL"
+      },
+      "category": "Development & Workflow",
+      "description": "Plan Tandem workflows in Codex, then validate, preview, and run them through the governed Tandem engine.",
+      "icon": "./plugins/frumu-ai/tandem-codex-plugin/assets/icon.png"
+    },
     {
       "name": "tartinerlabs",
       "displayName": "Tartiner Labs",

README.md

@@ -136,6 +136,7 @@ Third-party plugins built by the community. [PRs welcome](#contributing)!
 - [Session Orchestrator](https://github.com/Kanevry/session-orchestrator) - Session orchestration for Claude Code, Codex, and Cursor IDE — structured planning, wave-based execution, VCS integration (GitLab + GitHub), quality gates, and clean session close-out with issue tracking.
 - [Spec-Driven Development](https://github.com/Habib0x0/spec-driven-plugin) - Three-phase Requirements → Design → Tasks workflow for Claude Code and Codex — EARS notation acceptance criteria, autonomous execution loop, cross-spec dependencies, and post-implementation acceptance testing.
 - [tailtest](https://github.com/avansaber/tailtest-codex) - Hook-powered test generation -- detects files changed during an agent turn and instructs Codex to write and run tests automatically. Zero config, 8 languages.
+- [Tandem Workflow Architect](https://github.com/frumu-ai/tandem-codex-plugin) - Plan Tandem workflows in Codex, then validate, preview, and run them through the governed Tandem engine.
 - [Tartiner Labs](https://github.com/tartinerlabs/skills) - Agent skills for git workflows, GitHub automation, security audits, code refactoring, and project tooling.
 - [Team Skills Platform](https://github.com/Colin4k1024/tsp) - Role-based team delivery framework — Tech Lead-orchestrated 8-role system with 195+ skills, 27 specialist agents, 80+ commands, hooks, and ECC harness for Claude Code, Codex, and OpenCode.
 - [Tool Advisor](https://github.com/dragon1086/claude-skills) - Read-only meta-skill that scans your MCP servers, skills, plugins, and CLI tools, then suggests up to three ranked approaches (Methodical / Fast / Deep) with a copy-paste Quick Action table.

plugins.json

@@ -3,7 +3,7 @@
   "name": "awesome-codex-plugins",
   "version": "1.0.0",
   "last_updated": "2026-05-13",
-  "total": 68,
+  "total": 69,
   "categories": [
     "Development & Workflow",
     "Tools & Integrations"
@@ -239,6 +239,16 @@
       "source": "awesome-codex-plugins",
       "install_url": "https://raw.githubusercontent.com/avansaber/tailtest-codex/HEAD/.codex-plugin/plugin.json"
     },
+    {
+      "name": "Tandem Workflow Architect",
+      "url": "https://github.com/frumu-ai/tandem-codex-plugin",
+      "owner": "frumu-ai",
+      "repo": "tandem-codex-plugin",
+      "description": "Plan Tandem workflows in Codex, then validate, preview, and run them through the governed Tandem engine.",
+      "category": "Development & Workflow",
+      "source": "awesome-codex-plugins",
+      "install_url": "https://raw.githubusercontent.com/frumu-ai/tandem-codex-plugin/HEAD/.codex-plugin/plugin.json"
+    },
     {
       "name": "Tartiner Labs",
       "url": "https://github.com/tartinerlabs/skills",

plugins/frumu-ai/tandem-codex-plugin/.codex-plugin/plugin.json

@@ -0,0 +1,44 @@
+{
+  "name": "tandem-codex-plugin",
+  "version": "0.1.3",
+  "description": "Tandem Workflow Architect for Codex. Plan-mode design partner that helps you shape Tandem workflows (V2 automations and workflow plans) and hands them to the Tandem engine for validation, preview, and run. Plan with Codex. Govern with Tandem. Run with receipts.",
+  "keywords": [
+    "tandem",
+    "workflow",
+    "automation",
+    "mcp",
+    "architect",
+    "plan-mode"
+  ],
+  "homepage": "https://github.com/frumu-ai/tandem-codex-plugin",
+  "repository": "https://github.com/frumu-ai/tandem-codex-plugin",
+  "license": "MIT",
+  "author": {
+    "name": "frumu-ai",
+    "url": "https://github.com/frumu-ai"
+  },
+  "skills": "./skills/",
+  "mcpServers": "./.mcp.json",
+  "commands": "./commands/",
+  "interface": {
+    "displayName": "Tandem Workflow Architect",
+    "shortDescription": "Plan Tandem workflows in Codex; govern and run them in Tandem.",
+    "longDescription": "A Codex plugin for designing Tandem workflows with plan-mode guidance, bundled Tandem docs, validation, previews, and governed execution through the Tandem engine.",
+    "developerName": "frumu-ai",
+    "category": "Productivity",
+    "capabilities": [
+      "Interactive",
+      "Read",
+      "Write"
+    ],
+    "websiteURL": "https://github.com/frumu-ai/tandem-codex-plugin",
+    "brandColor": "#2563EB",
+    "defaultPrompt": [
+      "Create a Tandem workflow from an intent",
+      "Build a complex Tandem workflow DAG",
+      "Preview or validate a Tandem workflow"
+    ],
+    "composerIcon": "./assets/icon.png",
+    "logo": "./assets/icon.png"
+  }
+}

plugins/frumu-ai/tandem-codex-plugin/.gitignore

@@ -0,0 +1,20 @@
+node_modules/
+/plugins/
+/plugins/*/node_modules/
+dist/
+/plugins/*/dist/
+coverage/
+/plugins/*/coverage/
+.env
+.env.local
+/plugins/*/.env
+/plugins/*/.env.local
+.DS_Store
+.tandem/
+.tandem-codex/
+*.log
+*.tsbuildinfo
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*

plugins/frumu-ai/tandem-codex-plugin/.mcp.json

@@ -0,0 +1,7 @@
+{
+  "mcpServers": {
+    "tandemDocs": {
+      "url": "https://tandem.ac/mcp"
+    }
+  }
+}

plugins/frumu-ai/tandem-codex-plugin/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 frumu LTD
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.