Superpower Codex

A TypeScript MCP server that coordinates Codex and Antigravity CLI with a Superpowers-style software development workflow.

Codex handles planning, review, debugging, and verification. Antigravity CLI is the canonical coding executor. The server adds workspace authorization, Git-based change verification, acceptance criteria, compact task reports, and persisted diagnostics.

Requirements

• Node.js 20.19 or newer, or Node.js 22.12 or newer
• Codex CLI installed and authenticated
• Antigravity CLI (agy) installed and authenticated
• Git

Install

git clone https://github.com/Pushplayhero/superpower-codex-mcp.git
cd superpower-codex-mcp
npm.cmd install
npm.cmd run build
npm.cmd test

On macOS or Linux, use npm instead of npm.cmd.

Codex Desktop configuration

Add the server to your Codex MCP configuration. Replace the paths with your local clone and the workspaces the server may access.

[mcp_servers.superpower-codex]
command = "node"
args = ["C:\\path\\to\\superpower-codex-mcp\\dist\\src\\index.js"]

[mcp_servers.superpower-codex.env]
SUPERPOWER_CODEX_ALLOWED_ROOTS = "C:\\path\\to\\projects"

Restart Codex Desktop after changing MCP configuration.

On Windows, the server resolves Codex in this order:

1. SUPERPOWER_CODEX_COMMAND
2. codex.exe found on PATH
3. An existing global npm @openai/codex entrypoint

The packaged Codex Desktop binary under WindowsApps\OpenAI.Codex_* is skipped because Windows can reject external child-process launches with EPERM.

If no candidate exists, Codex-backed tools return structured diagnostics with codexCliAvailable: false and the paths that were searched.

Antigravity configuration

In a project that should use this MCP server, add .agents/mcp_config.json:

{
  "mcpServers": {
    "superpower-codex": {
      "command": "node",
      "args": [
        "C:\\path\\to\\superpower-codex-mcp\\dist\\src\\index.js"
      ],
      "env": {
        "SUPERPOWER_CODEX_ALLOWED_ROOTS": "C:\\path\\to\\projects"
      }
    }
  }
}

The default Antigravity executable is:

%LOCALAPPDATA%\agy\bin\agy.exe

Set SUPERPOWER_ANTIGRAVITY_COMMAND when it is installed elsewhere:

$env:SUPERPOWER_ANTIGRAVITY_COMMAND = "C:\custom\path\agy.exe"

Available tools

Tool	Purpose
validate_workspace	Validate workspace authorization and local capabilities without invoking a model.
summarize_repo_context	Read repository instructions such as AGENTS.md and GEMINI.md.
plan_with_codex	Ask Codex to create and save an implementation plan.
review_with_codex	Ask Codex to review a diff or selected files.
debug_with_codex	Ask Codex to investigate failures systematically.
verify_with_codex	Run explicitly allowed verification commands and ask Codex to assess the evidence.
review_code_quality	Run a local TypeScript structural scan without consuming model tokens.
run_antigravity_coding_task	Canonical coding execution tool backed by Antigravity CLI.
run_gemini_coding_task	Deprecated compatibility alias for run_antigravity_coding_task; it does not invoke Gemini CLI directly.
run_development_workflow	Coordinate plan, implement, review, fix, and verify stages.

Recommended workflow

1. Call validate_workspace.
2. Call summarize_repo_context.
3. Use plan_with_codex for broad or risky changes.
4. Execute the approved task with run_antigravity_coding_task.
5. Use review_code_quality as a token-free pre-filter.
6. Call review_with_codex.
7. Send review corrections back to Antigravity when required.
8. Call verify_with_codex before declaring completion.

For an automated version of this sequence, use run_development_workflow. Its verificationCommands input defaults to ["npm test", "npm run typecheck"] and can be replaced for pnpm, Bun, Python, Go, monorepo, or other project toolchains.

review_with_codex returns validated structured JSON with a status, summary, and severity-ordered findings array. Malformed model output is reported as an error instead of being interpreted as a clean review.

review_code_quality currently supports TypeScript. A Python-only workspace returns unsupportedLanguage: "python" instead of presenting zero scanned files as a clean review. Recursive Python detection ignores virtual environment and build directories (such as venv, .venv, __pycache__, .tox, build, dist, node_modules, and .git).

For explicit mixed selections (e.g. app.ts and app.py), the tool scans the TypeScript files and returns unsupportedFiles: ["app.py"] while omitting unsupportedLanguage.

Coding task example

{
  "workspacePath": "C:\\path\\to\\project",
  "prompt": "Implement the approved task using test-driven development.",
  "allowExecution": true,
  "timeoutSeconds": 1800,
  "model": "Gemini 3.5 Flash (Medium)",
  "mode": "execute",
  "planApproved": true,
  "requireCommit": true,
  "requireCleanWorkspace": true,
  "acceptanceCriteria": [
    {
      "id": "AC-1",
      "description": "The new behavior is covered by a regression test."
    }
  ],
  "allowedFiles": [
    "src/example.ts",
    "tests/example.test.ts"
  ],
  "responseDetail": "summary"
}

Supported model names:

• gemini-3.5-flash
• Gemini 3.5 Flash (Medium)
• Gemini 3.1 Pro (High)

Unsupported legacy Gemini model names are rejected. The server does not automatically retry with a stronger model.

Status model and diagnostics

Coding task statuses

The coding tools (run_antigravity_coding_task and the legacy alias run_gemini_coding_task) return a JSON payload with a status field:

• planned: A requested planning task was completed.
• implemented_unverified: Files may be implemented, but required test or acceptance evidence is incomplete.
• tests_passed: All supplied acceptance criteria map to named passing tests, but no commit was required or verified.
• committed: Required commit and acceptance evidence were verified successfully.
• mode_mismatch: Execute mode was requested, but the model asked for approval or returned a plan-only response.
• contract_failed: Preconditions or postconditions failed (e.g., dirty workspace before execution, missing commit, output outside allowedFiles).
• execution_failed: The tool or a required Git command failed to execute.
• timed_out: Execution exceeded the configured timeout.

Workflow statuses

• completed: Every recorded stage completed successfully.
• completed_with_issues: Implementation ran, but one or more later stages did not complete successfully.
• failed: The workflow could not pass an early prerequisite such as planning.

Deprecation guidance

Structured JSON responses from the legacy alias run_gemini_coding_task include a top-level machine-readable deprecation object:

"deprecation": {
  "message": "run_gemini_coding_task is deprecated. Please use run_antigravity_coding_task instead.",
  "replacement": "run_antigravity_coding_task"
}

Workflow diagnostics

When run_development_workflow does not complete cleanly, it returns these additional diagnostic fields:

• failedStage: The name of the first failing stage (e.g. "plan", "implement", "review", "verify").
• nextAction: A descriptive recommendation on what to do next to resolve the issue.
• failureSummary: The failed stage summary lifted to the top level.
• failureDetails: The failed stage details lifted to the top level.

Workspace safety

By default, only the MCP process working directory and its descendants are allowed. Additional roots must be explicitly configured:

$env:SUPERPOWER_CODEX_ALLOWED_ROOTS = "C:\projects;D:\work"

Use ; as the delimiter on Windows and : on macOS or Linux.

Additional safeguards:

• Coding execution requires allowExecution: true.
• Verification commands require allowCommandExecution: true.
• Verification commands run without a shell; pipes, redirects, and command separators are rejected.
• Strict execution compares reported files and commits with Git metadata.
• allowedFiles accepts only repository-relative paths.
• Antigravity does not recursively call the coding-task MCP tool.

Development

npm.cmd install
npm.cmd run typecheck
npm.cmd test
npm.cmd run build

The verified baseline is 160 passing tests across 11 test files.

Updating an existing Windows installation

Download superpower-codex-mcp-v0.1.1-windows.zip from the GitHub release, extract it, and run:

powershell -NoProfile -ExecutionPolicy Bypass `
  -File .\scripts\update-installed.ps1 `
  -InstallPath "C:\path\to\superpower-codex-mcp"

The updater validates the installation, creates a backup under .update-backups, installs production dependencies, and verifies MCP tool discovery. Restart Codex Desktop after the update.

License

MIT