How do I install the Authenticate skill?

Run npx skillmds@latest add reggiechan74/authenticate in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Authenticate skill do?

Authenticate Gmail and Google Calendar MCP servers. Use after first install, after codespace rebuild, or when MCP authentication fails. Runs OAuth flow for both Gmail and Calendar services. It is listed under AI & ML on SkillMD.

Is Authenticate safe to use?

This skill has not completed SkillMD's automated safety review yet. Capability flags: reads secrets. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Authenticate?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Authenticate free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Authenticate?

reggiechan74 (@reggiechan74) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Authenticate by reggiechan74 — Agent Skill

Name: Authenticate
Rating: 4.2 (5 reviews)
Author: reggiechan74

File contents

Google Workspace Authentication

Authenticate the Gmail and Google Calendar MCP servers via OAuth 2.0.

Prerequisites

A Google Cloud Platform project with a Desktop-type OAuth 2.0 Client ID
Download the OAuth JSON and place it in BOTH locations:
- ~/.gmail-mcp/gcp-oauth.keys.json
- ~/.calendar-mcp/gcp-oauth.keys.json
Enable these APIs in the GCP project:
- Gmail API
- Google Calendar API
- People API (for contact lookup)

Procedure

Verify OAuth keys exist:

ls ~/.gmail-mcp/gcp-oauth.keys.json ~/.calendar-mcp/gcp-oauth.keys.json

Create config directories if missing:
```
mkdir -p ~/.gmail-mcp ~/.calendar-mcp
```
Authenticate Gmail server (opens browser for OAuth consent):
```
node ${CLAUDE_PLUGIN_ROOT}/servers/gmail/index.js auth
```

Authenticate Calendar server:

node ${CLAUDE_PLUGIN_ROOT}/servers/calendar/index.js auth

Verify credentials were created:

ls ~/.gmail-mcp/credentials.json ~/.calendar-mcp/credentials.json

Test connectivity by running /mcp to reconnect both servers.
Report success/failure to user.

Troubleshooting

Port 3000 conflict: lsof -ti:3000 | xargs kill -9 then retry
Browser doesn't open: Copy the auth URL from terminal output manually
People API error: Ensure People API is enabled in GCP console
Token expired: Re-run this authentication flow. Tokens auto-refresh during normal use but may expire after prolonged inactivity.

Frequently asked questions

Authenticate