Gtasks CLI

Google Tasks CLI Skill

This skill enables you to manage Google Tasks directly from the command line using the gtasks CLI tool.

It can also be installed into supported AI agent skill directories with the built-in gtasks skills commands.

Prerequisites

Before using any commands, ensure the following requirements are met:

1. GTasks Installation

Check if gtasks is installed on the system:

# Cross-platform check (works on macOS, Linux, Windows Git Bash)
gtasks --version 2>/dev/null || gtasks.exe --version 2>/dev/null || echo "gtasks not found"

# Or use which/where commands
# macOS/Linux:
which gtasks

# Windows (Command Prompt):
where gtasks

# Windows (PowerShell):
Get-Command gtasks

If gtasks is not installed:

macOS/Linux (recommended):

curl -fsSL https://gtasks.sidv.dev/install | bash

Installs to ~/.local/bin by default. Set INSTALL_DIR to override:

INSTALL_DIR=/usr/local/bin curl -fsSL https://gtasks.sidv.dev/install | bash

Manual install:

1. Download the binary for your system from GitHub Releases
2. Move to a directory in your PATH (e.g. ~/.local/bin or /usr/local/bin)
3. chmod +x gtasks

Windows: Download the binary from GitHub Releases and add to PATH.

Verify installation: gtasks --version

IMPORTANT for Agents: Always check if gtasks is installed before attempting to use it. If the command is not found, inform the user and provide installation instructions.

2. Environment Variables

Set up Google OAuth2 credentials as environment variables:

export GTASKS_CLIENT_ID="your-client-id.apps.googleusercontent.com"
export GTASKS_CLIENT_SECRET="your-client-secret"

How to get credentials:

1. Go to Google Cloud Console
2. Create a new project or select an existing one
3. Enable the Google Tasks API
4. Create OAuth2 credentials (Application type: "Desktop app")
5. Note the authorized redirect URIs that gtasks uses:
   • http://localhost:8080/callback
   • http://localhost:8081/callback
   • http://localhost:8082/callback
   • http://localhost:9090/callback
   • http://localhost:9091/callback

For persistent setup, the recommended approach is to add credentials to the gtasks config file:

# ~/.config/gtasks/config.toml  (new installs)
# ~/.gtasks/config.toml          (legacy installs)
[credentials]
client_id     = "your-client-id.apps.googleusercontent.com"
client_secret = "your-client-secret"

Set permissions: chmod 600 ~/.config/gtasks/config.toml

Alternatively, export from your shell profile — do not commit these values to version control:

export GTASKS_CLIENT_ID="your-client-id"
export GTASKS_CLIENT_SECRET="your-client-secret"

3. Authentication

Once environment variables are set, authenticate with Google:

gtasks login

This will open a browser for OAuth2 authentication. The token is stored in the system keyring (macOS Keychain, Linux Secret Service, Windows Credential Manager). On headless systems where no keyring is available, it falls back to a token file in the config directory. If you no longer need access, run gtasks logout to remove the stored token.

4. Optional: Install This Skill for Supported Agents

If gtasks is already installed, you can install this skill into supported agent directories with:

gtasks skills install

Supported agent targets:

• claude -> ~/.claude/skills/gtasks-cli/
• codex -> ~/.agents/skills/gtasks-cli/
• openclaw -> ~/.openclaw/skills/gtasks-cli/

Useful commands:

gtasks skills status
gtasks skills install --agent codex
gtasks skills install --agent all
gtasks skills uninstall --agent codex

For automated setups, prefer --agent <name> or --agent all to avoid interactive prompts.

Core Concepts

• Task Lists: Containers that hold tasks (like "Work", "Personal", "Shopping")
• Tasks: Individual to-do items within a task list
• Task Properties: Title (required), notes/description (optional), due date (optional), status (pending/completed)

Command Structure

All commands follow this pattern:

gtasks [command] [subcommand] [flags] [arguments]

Authentication

Login

gtasks login

Opens browser for Google OAuth2 authentication. Required before using any other commands.

Logout

gtasks logout

Removes stored credentials from the system keyring (and token file if present).

Skill Management

These commands manage installation of the gtasks-cli skill itself for supported AI agents.

Check Skill Status

gtasks skills status

Shows whether the skill is installed for Claude, Codex, and OpenClaw, along with the installed version when available.

Install the Skill

gtasks skills install
gtasks skills install --agent claude
gtasks skills install --agent codex
gtasks skills install --agent openclaw
gtasks skills install --agent all

Installs the embedded gtasks-cli skill files into the selected agent skill directory.

Uninstall the Skill

gtasks skills uninstall
gtasks skills uninstall --agent codex
gtasks skills uninstall --agent all

Removes the installed gtasks-cli skill from the selected agent skill directory.

Task List Management

View All Task Lists

gtasks tasklists view

Displays all task lists with numbered indices.

Output Example:

[1] My Tasks
[2] Work
[3] Personal

Create a Task List

gtasks tasklists add -t "Work Projects"
gtasks tasklists add --title "Shopping List"

Creates a new task list with the specified title.

Flags:

• -t, --title: Task list title (required)

Delete a Task List

gtasks tasklists rm

Interactive prompt to select and delete a task list.

Update Task List Title

gtasks tasklists update -t "New Title"

Interactive prompt to select a task list and update its title.

Flags:

• -t, --title: New title for the task list (required)

Task Management

All task commands can optionally specify a task list using the -l flag. If omitted, gtasks uses GTASKS_DEFAULT_TASKLIST env var or tasks.default_task_list from the config file. If only one list exists, it is selected automatically. Otherwise you'll be prompted interactively.

View Tasks

Basic view:

gtasks tasks view
gtasks tasks view -l "Work"

Include completed tasks:

gtasks tasks view --include-completed
gtasks tasks view -i

Show only completed tasks:

gtasks tasks view --completed

Sort tasks:

gtasks tasks view --sort=due        # Sort by due date
gtasks tasks view --sort=title      # Sort by title
gtasks tasks view --sort=position   # Sort by position (default)

Output formats:

gtasks tasks view --format=table    # Table format (default)
gtasks tasks view --format=json     # JSON output
gtasks tasks view --format=csv      # CSV output

Table Output Example:

Tasks in Work:
No  Title              Description         Status     Due
1   Finish report      Q4 analysis         pending    25 December 2024
2   Team meeting       Weekly sync         pending    -
3   Code review        PR #123            completed  20 December 2024

JSON Output Example:

[
  {
    "number": 1,
    "title": "Finish report",
    "description": "Q4 analysis",
    "status": "pending",
    "due": "2024-12-25"
  }
]

Create a Task

Interactive mode:

gtasks tasks add
gtasks tasks add -l "Work"

Prompts for title, notes, and due date.

Flag mode:

gtasks tasks add -t "Buy groceries"
gtasks tasks add -t "Finish report" -n "Q4 analysis" -d "2024-12-25"
gtasks tasks add -t "Call dentist" -d "tomorrow"
gtasks tasks add -t "Team meeting" -d "Dec 25"

Flags:

• -t, --title: Task title (required for non-interactive mode)
• -n, --note: Task notes/description (optional)
• -d, --due: Due date (optional, flexible format)

Date Format Examples: The date parser supports many formats:

• 2024-12-25 (ISO format)
• Dec 25, 2024
• December 25
• tomorrow
• next Friday
• 12/25/2024

See dateparse examples for all supported formats.

Mark Task as Complete

With task number:

gtasks tasks done 1
gtasks tasks done 3 -l "Work"

Interactive mode:

gtasks tasks done
gtasks tasks done -l "Personal"

Prompts to select a task from the list.

Delete a Task

With task number:

gtasks tasks rm 2
gtasks tasks rm 1 -l "Shopping"

Interactive mode:

gtasks tasks rm
gtasks tasks rm -l "Work"

Prompts to select a task to delete.

View Task Details

With task number:

gtasks tasks info 1
gtasks tasks info 3 -l "Work"

Interactive mode:

gtasks tasks info
gtasks tasks info -l "Personal"

Output Example:

Task: Finish report
Status: Needs action
Due: 25 December 2024
Notes: Complete Q4 analysis and submit to manager

Links:
  - https://docs.google.com/document/d/...

View in Google Tasks: https://tasks.google.com/...

Common Workflows

Quick Task Creation

When a user says "add a task to my work list":

gtasks tasks add -l "Work" -t "Task title"

Check Today's Tasks

gtasks tasks view --sort=due

Complete Multiple Tasks

gtasks tasks done -l "Work"
# Interactive prompt appears, select task
gtasks tasks done -l "Work"
# Repeat as needed

View All Tasks Across Lists

Run view command multiple times for each list, or first list all task lists:

gtasks tasklists view
gtasks tasks view -l "Work"
gtasks tasks view -l "Personal"

Export Tasks

gtasks tasks view --format=json > tasks.json
gtasks tasks view --format=csv > tasks.csv

Best Practices

1. Always check authentication first: If commands fail with authentication errors, run gtasks login

2. Use task list flag for automation: When scripting or when the user specifies a list name, use -l flag to avoid interactive prompts

3. Leverage flexible date parsing: The --due flag accepts natural language dates like "tomorrow", "next week", etc.

4. Use appropriate output format:

   • Table format for human-readable output
   • JSON for parsing/integration with other tools
   • CSV for spreadsheet import

5. Task numbers are ephemeral: Task numbers change when tasks are added, completed, or deleted. Always view the list first to get current numbers.

6. Handle missing lists gracefully: If a user specifies a non-existent list name, the command will error. Always verify list names first with gtasks tasklists view.

Error Handling

Common errors and solutions:

• "Failed to get service" or Authentication errors:
  • First, ensure environment variables are set: echo $GTASKS_CLIENT_ID
  • If variables are not set, export them (see Prerequisites section)
  • Then run gtasks login to authenticate
• "incorrect task-list name": The specified list name doesn't exist. Use gtasks tasklists view to see available lists
• "Incorrect task number": The task number is invalid. Use gtasks tasks view to see current task numbers
• "Date format incorrect": The date string couldn't be parsed. Use formats like "2024-12-25", "tomorrow", or "Dec 25"

Examples

Example 1: Create a shopping list and add items

gtasks tasklists add -t "Shopping"
gtasks tasks add -l "Shopping" -t "Milk"
gtasks tasks add -l "Shopping" -t "Bread"
gtasks tasks add -l "Shopping" -t "Eggs"

Example 2: Review and complete work tasks

gtasks tasks view -l "Work" --sort=due
gtasks tasks done 1 -l "Work"

Example 3: Add task with deadline

gtasks tasks add -l "Work" -t "Submit proposal" -n "Include budget and timeline" -d "next Friday"

Example 4: Export completed tasks

gtasks tasks view --completed --format=json -l "Work" > completed_work.json

Tips for Agents

Before Running Any Commands

1. Check gtasks installation first:

   # Try to run gtasks version check
   gtasks --version 2>/dev/null || gtasks.exe --version 2>/dev/null
   

   If this fails, inform the user that gtasks is not installed and provide installation instructions from the Prerequisites section.

2. Verify environment variables are set:

   # Check if variables exist (macOS/Linux)
   [ -n "$GTASKS_CLIENT_ID" ] && echo "GTASKS_CLIENT_ID is set" || echo "GTASKS_CLIENT_ID is not set"
   [ -n "$GTASKS_CLIENT_SECRET" ] && echo "GTASKS_CLIENT_SECRET is set" || echo "GTASKS_CLIENT_SECRET is not set"
   
   # Windows PowerShell
   if ($env:GTASKS_CLIENT_ID) { "GTASKS_CLIENT_ID is set" } else { "GTASKS_CLIENT_ID is not set" }
   if ($env:GTASKS_CLIENT_SECRET) { "GTASKS_CLIENT_SECRET is set" } else { "GTASKS_CLIENT_SECRET is not set" }
   

3. Check authentication status:

   gtasks tasklists view &>/dev/null && echo "Authenticated" || echo "Not authenticated - run 'gtasks login'"
   

General Tips

• When the user mentions "tasks" without specifying a tool, ask if they want to use Google Tasks
• If the user asks about their tasks, first run gtasks tasklists view to see available lists
• Always confirm which task list to use if not specified by the user
• When creating tasks with dates, prefer explicit date formats (YYYY-MM-DD) over relative terms for clarity
• Remember that task numbers are 1-indexed and change after modifications
• If a command requires interaction but you're running non-interactively, use flags to provide all required information