google-calendar-skill: Research & Knowledge for AI Agents | OpenAgentSkill

Overview

Manage Google Calendar - search, create, update events and answer calendar questions. Use when user wants to interact with their Google Calendar for scheduling and calendar operations.

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Google Calendar Skill

This skill provides comprehensive Google Calendar integration through lightweight CLI scripts. All operations are token-efficient and composable.

First-Time Setup

Before using this skill, you must set up OAuth authentication:

Install dependencies:

cd ~/.claude/skills/google-calendar-skill && npm install

Set up Google Cloud credentials:
- Follow the guide in docs/google-cloud-setup.md
- Enable Google Calendar API
- Download credentials.json and save to scripts/auth/credentials.json

Authenticate:

cd ~/.claude/skills/google-calendar-skill && npm run setup

This will open a browser for Google OAuth and save your token locally.

Multi-Account Support

The Calendar skill supports multiple accounts (e.g., personal and work calendars):

Add Additional Accounts

# Add a second account (from skill directory)
npm run setup -- --account work

# Add a third account
npm run setup -- --account personal

Each account needs separate OAuth authentication.

Manage Accounts

# List all configured accounts
node scripts/manage-accounts.js --list

# Set default account (used when --account is not specified)
node scripts/manage-accounts.js --set-default work

# Remove an account
node scripts/manage-accounts.js --remove old-account

Using Specific Accounts

All Calendar operations support the --account parameter:

# List work calendar events
node calendar-events-list.js --account work --limit 10

# Create event on personal calendar (or omit --account to use default)
node calendar-events-create.js --account personal --summary "..." --start "..." --end "..."

# Search work calendar
node calendar-events-list.js --account work --query "team meeting"

If --account is not specified, the default account is used.

Usage Guidelines

1. Read Documentation On-Demand

When first using Calendar operations, read the comprehensive README:

cat ~/.claude/skills/google-calendar-skill/README.md

This provides detailed usage examples for all operations.

2. Execute Scripts via Bash

All scripts are in the scripts/ directory and output JSON for easy parsing:

cd ~/.claude/skills/google-calendar-skill/scripts

3. Parse JSON Output

All scripts return JSON. Parse the output and present relevant information to the user in a friendly format.

4. Chain Operations

Save intermediate results to files when chaining operations:

# List events and save
node calendar-events-list.js --query "team meeting" > /tmp/events.json

# Get details for first event
EVENT_ID=$(cat /tmp/events.json | jq -r '.events[0].id')
node calendar-events-get.js --id "$EVENT_ID"

Available Operations

List Calendars

node calendar-list.js

Search/List Events

# Upcoming events
node calendar-events-list.js --limit 10

# Search by date range
node calendar-events-list.js \
  --timeMin "2025-11-15T00:00:00Z" \
  --timeMax "2025-11-30T23:59:59Z"

# Search by keyword
node calendar-events-list.js --query "team meeting"

Get Event Details

node calendar-events-get.js --id "EVENT_ID"

Create Event

# Timed event
node calendar-events-create.js \
  --summary "Team Meeting" \
  --start "2025-11-20T14:00:00-08:00" \
  --end "2025-11-20T15:00:00-08:00" \
  --location "Conference Room A" \
  --attendees "alice@example.com,bob@example.com"

# All-day event
node calendar-events-create.js \
  --summary "Company Holiday" \
  --allDay \
  --date "2025-12-25"

# With Google Meet
node calendar-events-create.js \
  --summary "Team Sync" \
  --start "2025-11-20T14:00:00-08:00" \
  --end "2025-11-20T15:00:00-08:00" \
  --addMeet

Update Event

# Update title
node calendar-events-update.js --id "EVENT_ID" --summary "New Title"

# Update time
node calendar-events-update.js \
  --id "EVENT_ID" \
  --start "2025-11-20T15:00:00-08:00" \
  --end "2025-11-20T16:00:00-08:00"

# Add attendees (preserves existing)
node calendar-events-update.js --id "EVENT_ID" --addAttendees "new@example.com"

Delete Event

node calendar-events-delete.js --id "EVENT_ID"

Quick Add (Natural Language)

node calendar-events-quick.js --text "Lunch with Sarah tomorrow at 12pm"

Common Use Cases

Answering Calendar Questions

When users ask about their schedule:

Use calendar-events-list.js with appropriate time filters
Parse the JSON output
Present a natural language summary

Example:

# User asks: "What's on my calendar today?"
TODAY_START=$(date -u +"%Y-%m-%dT00:00:00Z")
TODAY_END=$(date -u +"%Y-%m-%dT23:59:59Z")
node calendar-events-list.js --timeMin "$TODAY_START" --timeMax "$TODAY_END"

Creating Events from Natural Language

For simple event creation, use quick add:

# User says: "Schedule lunch with Bob tomorrow at noon"
node calendar-events-quick.js --text "Lunch with Bob tomorrow at 12pm"

For detailed events with specific requirements, use create:

node calendar-events-create.js \
  --summary "Lunch with Bob" \
  --start "2025-11-16T12:00:00-08:00" \
  --end "2025-11-16T13:00:00-08:00" \
  --location "Restaurant Name"

Modifying Events

Search for the event by summary or time
Extract the event ID from results
Use update script with specific changes

# Find event
node calendar-events-list.js --query "team meeting" > /tmp/results.json
EVENT_ID=$(cat /tmp/results.json | jq -r '.events[0].id')

# Update it
node calendar-events-update.js --id "$EVENT_ID" --location "New Location"

Time Zones and Date Formats

ISO 8601 DateTime Format

Use for --start and --end with timed events:

2025-11-20T14:00:00-08:00  (2pm Pacific)
2025-11-20T14:00:00-05:00  (2pm Eastern)
2025-11-20T14:00:00Z       (2pm UTC)

Date-Only Format

Use for --date with all-day events:

2025-11-20  (YYYY-MM-DD)

Setting Timezone

# Default is America/Los_Angeles
node calendar-events-create.js --summary "..." --start "..." --end "..."

# Custom timezone
node calendar-events-create.js \
  --summary "..." \
  --start "..." \
  --end "..." \
  --timezone "America/New_York"

Error Handling

If scripts fail:

Check that token.json exists in scripts/auth/
If token is expired, run npm run setup again
Verify the user granted Google Calendar API permissions
Ensure date/time formats are valid ISO 8601
Check that event IDs are correct

Common error patterns:

{
  "success": false,
  "error": "Token not found. Run: npm run setup"
}

Best Practices

Always change to the scripts directory first to ensure relative paths work
Parse JSON output and present user-friendly summaries
Validate date/time formats before passing to scripts
Handle timezones explicitly when creating/updating events
Use natural language quickAdd for simple events
Use structured create for events with specific requirements
Extract event IDs from list/search results when updating or deleting
Present calendar data clearly with dates, times, and attendee information

Token Efficiency

This skill is designed for minimal token usage:

Documentation loaded only when needed
Scripts are small and focused
JSON output is compact and parseable
No persistent server overhead
~300-500 tokens vs 13,000+ for MCP-based solutions

View source ↗

File metadata

name: google-calendar-skill
description: "Manage Google Calendar - search, create, update events and answer calendar questions. Use when user wants to interact with their Google Calendar for scheduling and calendar operations."
version: 1.0.0
allowed-tools: [Bash, Read, Write]

View original text

---
name: google-calendar-skill
description: "Manage Google Calendar - search, create, update events and answer calendar questions. Use when user wants to interact with their Google Calendar for scheduling and calendar operations."
version: 1.0.0
allowed-tools: [Bash, Read, Write]
---

# Google Calendar Skill

This skill provides comprehensive Google Calendar integration through lightweight CLI scripts. All operations are token-efficient and composable.

## First-Time Setup

Before using this skill, you must set up OAuth authentication:

1. **Install dependencies:**
   ```bash
   cd ~/.claude/skills/google-calendar-skill && npm install
   ```

2. **Set up Google Cloud credentials:**
   - Follow the guide in `docs/google-cloud-setup.md`
   - Enable Google Calendar API
   - Download `credentials.json` and save to `scripts/auth/credentials.json`

3. **Authenticate:**
   ```bash
   cd ~/.claude/skills/google-calendar-skill && npm run setup
   ```

This will open a browser for Google OAuth and save your token locally.

## Multi-Account Support

The Calendar skill supports multiple accounts (e.g., personal and work calendars):

### Add Additional Accounts

```bash
# Add a second account (from skill directory)
npm run setup -- --account work

# Add a third account
npm run setup -- --account personal
```

Each account needs separate OAuth authentication.

### Manage Accounts

```bash
# List all configured accounts
node scripts/manage-accounts.js --list

# Set default account (used when --account is not specified)
node scripts/manage-accounts.js --set-default work

# Remove an account
node scripts/manage-accounts.js --remove old-account
```

### Using Specific Accounts

All Calendar operations support the `--account` parameter:

```bash
# List work calendar events
node calendar-events-list.js --account work --limit 10

# Create event on personal calendar (or omit --account to use default)
node calendar-events-create.js --account personal --summary "..." --start "..." --end "..."

# Search work calendar
node calendar-events-list.js --account work --query "team meeting"
```

If `--account` is not specified, the default account is used.

## Usage Guidelines

### 1. Read Documentation On-Demand

When first using Calendar operations, read the comprehensive README:
```bash
cat ~/.claude/skills/google-calendar-skill/README.md
```

This provides detailed usage examples for all operations.

### 2. Execute Scripts via Bash

All scripts are in the `scripts/` directory and output JSON for easy parsing:

```bash
cd ~/.claude/skills/google-calendar-skill/scripts
```

### 3. Parse JSON Output

All scripts return JSON. Parse the output and present relevant information to the user in a friendly format.

### 4. Chain Operations

Save intermediate results to files when chaining operations:

```bash
# List events and save
node calendar-events-list.js --query "team meeting" > /tmp/events.json

# Get details for first event
EVENT_ID=$(cat /tmp/events.json | jq -r '.events[0].id')
node calendar-events-get.js --id "$EVENT_ID"
```

## Available Operations

### List Calendars
```bash
node calendar-list.js
```

### Search/List Events
```bash
# Upcoming events
node calendar-events-list.js --limit 10

# Search by date range
node calendar-events-list.js \
  --timeMin "2025-11-15T00:00:00Z" \
  --timeMax "2025-11-30T23:59:59Z"

# Search by keyword
node calendar-events-list.js --query "team meeting"
```

### Get Event Details
```bash
node calendar-events-get.js --id "EVENT_ID"
```

### Create Event
```bash
# Timed event
node calendar-events-create.js \
  --summary "Team Meeting" \
  --start "2025-11-20T14:00:00-08:00" \
  --end "2025-11-20T15:00:00-08:00" \
  --location "Conference Room A" \
  --attendees "alice@example.com,bob@example.com"

# All-day event
node calendar-events-create.js \
  --summary "Company Holiday" \
  --allDay \
  --date "2025-12-25"

# With Google Meet
node calendar-events-create.js \
  --summary "Team Sync" \
  --start "2025-11-20T14:00:00-08:00" \
  --end "2025-11-20T15:00:00-08:00" \
  --addMeet
```

### Update Event
```bash
# Update title
node calendar-events-update.js --id "EVENT_ID" --summary "New Title"

# Update time
node calendar-events-update.js \
  --id "EVENT_ID" \
  --start "2025-11-20T15:00:00-08:00" \
  --end "2025-11-20T16:00:00-08:00"

# Add attendees (preserves existing)
node calendar-events-update.js --id "EVENT_ID" --addAttendees "new@example.com"
```

### Delete Event
```bash
node calendar-events-delete.js --id "EVENT_ID"
```

### Quick Add (Natural Language)
```bash
node calendar-events-quick.js --text "Lunch with Sarah tomorrow at 12pm"
```

## Common Use Cases

### Answering Calendar Questions

When users ask about their schedule:
1. Use `calendar-events-list.js` with appropriate time filters
2. Parse the JSON output
3. Present a natural language summary

Example:
```bash
# User asks: "What's on my calendar today?"
TODAY_START=$(date -u +"%Y-%m-%dT00:00:00Z")
TODAY_END=$(date -u +"%Y-%m-%dT23:59:59Z")
node calendar-events-list.js --timeMin "$TODAY_START" --timeMax "$TODAY_END"
```

### Creating Events from Natural Language

For simple event creation, use quick add:
```bash
# User says: "Schedule lunch with Bob tomorrow at noon"
node calendar-events-quick.js --text "Lunch with Bob tomorrow at 12pm"
```

For detailed events with specific requirements, use create:
```bash
node calendar-events-create.js \
  --summary "Lunch with Bob" \
  --start "2025-11-16T12:00:00-08:00" \
  --end "2025-11-16T13:00:00-08:00" \
  --location "Restaurant Name"
```

### Modifying Events

1. Search for the event by summary or time
2. Extract the event ID from results
3. Use update script with specific changes

```bash
# Find event
node calendar-events-list.js --query "team meeting" > /tmp/results.json
EVENT_ID=$(cat /tmp/results.json | jq -r '.events[0].id')

# Update it
node calendar-events-update.js --id "$EVENT_ID" --location "New Location"
```

## Time Zones and Date Formats

### ISO 8601 DateTime Format
Use for `--start` and `--end` with timed events:
```
2025-11-20T14:00:00-08:00  (2pm Pacific)
2025-11-20T14:00:00-05:00  (2pm Eastern)
2025-11-20T14:00:00Z       (2pm UTC)
```

### Date-Only Format
Use for `--date` with all-day events:
```
2025-11-20  (YYYY-MM-DD)
```

### Setting Timezone
```bash
# Default is America/Los_Angeles
node calendar-events-create.js --summary "..." --start "..." --end "..."

# Custom timezone
node calendar-events-create.js \
  --summary "..." \
  --start "..." \
  --end "..." \
  --timezone "America/New_York"
```

## Error Handling

If scripts fail:
- Check that `token.json` exists in `scripts/auth/`
- If token is expired, run `npm run setup` again
- Verify the user granted Google Calendar API permissions
- Ensure date/time formats are valid ISO 8601
- Check that event IDs are correct

Common error patterns:
```json
{
  "success": false,
  "error": "Token not found. Run: npm run setup"
}
```

## Best Practices

1. **Always change to the scripts directory first** to ensure relative paths work
2. **Parse JSON output** and present user-friendly summaries
3. **Validate date/time formats** before passing to scripts
4. **Handle timezones explicitly** when creating/updating events
5. **Use natural language quickAdd** for simple events
6. **Use structured create** for events with specific requirements
7. **Extract event IDs** from list/search results when updating or deleting
8. **Present calendar data clearly** with dates, times, and attendee information

## Token Efficiency

This skill is designed for minimal token usage:
- Documentation loaded only when needed
- Scripts are small and focused
- JSON output is compact and parseable
- No persistent server overhead
- ~300-500 tokens vs 13,000+ for MCP-based solutions

Review the source

Skill source recorded

Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.

Review before install: Avoid automatic install

License: MIT

Dependency or permission surface needs review
Permission surface may require sandboxing
The skill uses `npm install` which introduces supply chain risk from third-party dependencies, though this is standard practice.
The action logger writes to a file and may log sensitive event details if sanitization is incomplete; the provided excerpt shows sanitization functions but their full implementation is not visible.
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
GitHub adoption: 94 GitHub stars
Stars/forks activity: 94 stars, 5 forks; issue activity unavailable in current metadata
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution

Open full audit

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Source & usage notes

Indexed

Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.

Source repository: aisa-group/skill-inject
License: MIT
Version: 1.0.0
Last GitHub push: Aug 29, 2026
Registry updated: Sep 7, 2026
Instruction path: data/skills/google-calendar-skill/SKILL.md @ 182f3d9d9836

Version reported in registry metadata; check source releases before relying on it.

Quality

66/100

Promising

Trust

55/100

Agent access

This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.

Open install API LLM text format Open manifest Auto-resolve Plan

More details

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      "productionOutcomes": 0,
      "humanReviewRequired": 0,
      "uniqueAgents": 0,
      "lastOutcomeAt": null
    },
    "signals": [],
    "penalties": [
      "No real agent outcome evidence yet"
    ]
  },
  "audit": {
    "score": 73,
    "risk_level": "needs_review",
    "risk_label": "Needs review",
    "warnings": [
      "Dependency or permission surface needs review",
      "Permission surface may require sandboxing",
      "The skill uses `npm install` which introduces supply chain risk from third-party dependencies, though this is standard practice.",
      "The action logger writes to a file and may log sensitive event details if sanitization is incomplete; the provided excerpt shows sanitization functions but their full implementation is not visible.",
      "Quality score needs review",
      "Permission surface needs review: secrets or environment access, shell or command execution",
      "GitHub adoption: 94 GitHub stars",
      "Stars/forks activity: 94 stars, 5 forks; issue activity unavailable in current metadata"
    ]
  },
  "safety_gate": {
    "tier": "blocked",
    "label": "Blocked for auto-install",
    "auto_install_policy": "block",
    "auto_install_allowed": false,
    "human_review_required": true,
    "blocked": true,
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
  },
  "quality": {
    "score": 66,
    "label": "Promising"
  },
  "supply": {
    "track": "Research and knowledge work",
    "scenario": "Research agents",
    "maintenance": "19d since push",
    "risk": "Needs review"
  },
  "alternative_skills": [
    {
      "slug": "yanliudesign-mono-color-skill",
      "name": "mono-color",
      "url": "https://www.openagentskill.com/skills/yanliudesign-mono-color-skill",
      "stars": 1919,
      "install_command": "npx skills add yanliudesign/mono-color-skill --skill mono-color",
      "trust_score": 85,
      "audit_score": 93
    }
  ],
  "do_not_use_when": [
    "teams that need a vendor-supported SLA",
    "production agents without a repository review",
    "The skill uses `npm install` which introduces supply chain risk from third-party dependencies, though this is standard practice.",
    "No OpenAgentSkill engagement data yet",
    "High-risk permission hints: Shell or command execution, Secrets or environment access",
    "Dependency or permission surface needs review",
    "Permission surface may require sandboxing",
    "The action logger writes to a file and may log sensitive event details if sanitization is incomplete; the provided excerpt shows sanitization functions but their full implementation is not visible."
  ],
  "agent_contract": {
    "task_input": "Use google-calendar-skill in an agent workflow",
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
    "install_policy": "block",
    "minimum_review_before_use": [
      "Trust: 63/100 Manual review",
      "Audit: 73/100 Needs review",
      "Safety: 25/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "aisa-group-google-calendar-skill (google-calendar-skill)",
      "install_command": "npx skills add aisa-group/skill-inject --skill google-calendar-skill",
      "risk_summary": "Needs review; Blocked for auto-install; Review before production",
      "verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
    }
  },
  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "aisa-group-google-calendar-skill",
      "task": "Use google-calendar-skill in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/aisa-group-google-calendar-skill",
    "api": "https://www.openagentskill.com/api/agent/skills/aisa-group-google-calendar-skill",
    "audit": "https://www.openagentskill.com/skills/aisa-group-google-calendar-skill/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=aisa-group-google-calendar-skill&task=Use%20google-calendar-skill%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20google-calendar-skill%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20google-calendar-skill%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/aisa-group-google-calendar-skill/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/aisa-group-google-calendar-skill"
  }
}

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Creator: aisa-group
Source: aisa-group/skill-inject
Indexed by: OpenAgentSkill community index

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