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Things MCP Server

by elizagarate

get_tagged_items

Retrieves all tasks, projects, and items in Things 3 that are associated with a given tag.

Instructions

Get items with a specific tag

Args: tag: Tag title to filter by

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
tagYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Implementation Reference

  • The handler function for the 'get_tagged_items' tool. It takes a tag parameter, calls things.todos(tag=tag, include_items=True) to fetch items with that tag, formats each todo using format_todo(), and returns them joined by separators.
    @mcp.tool
    async def get_tagged_items(tag: str) -> str:
        """Get items with a specific tag
    
        Args:
            tag: Tag title to filter by
        """
        todos = things.todos(tag=tag, include_items=True)
        if not todos:
            return f"No items found with tag '{tag}'"
    
        formatted_todos = [format_todo(todo) for todo in todos]
        return "\n\n---\n\n".join(formatted_todos)
  • The tool is registered with MCP via the @mcp.tool decorator. The mcp object is a FastMCP instance created on line 19 of server.py and exported via __init__.py.
    @mcp.tool
    async def get_tagged_items(tag: str) -> str:
  • Input schema: the 'tag' parameter is a required string. The docstring describes it as 'Tag title to filter by'. The return type is a plain string.
    Args:
        tag: Tag title to filter by
    """
  • The format_todo() helper function is used by get_tagged_items to format each todo item into a readable string including title, UUID, type, dates, notes, project, tags, and checklist items.
    def format_todo(todo: dict) -> str:
        """Helper function to format a single todo into a readable string."""
        logger.debug(f"Formatting todo: {todo}")
        todo_text = f"Title: {todo['title']}"
    
        # Add UUID for reference
        todo_text += f"\nUUID: {todo['uuid']}"
    
        # Add type
        todo_text += f"\nType: {todo['type']}"
    
        # Add status if present
        if todo.get('status'):
            todo_text += f"\nStatus: {todo['status']}"
    
        # Look up parent project once (used for both List status and Project display)
        # For heading-level tasks without a project field, resolve heading -> project
        parent_project = None
        if todo.get('project'):
            try:
                parent_project = things.get(todo['project'])
            except Exception:
                pass
        elif todo.get('heading'):
            try:
                heading_obj = things.get(todo['heading'])
                if heading_obj and heading_obj.get('project'):
                    parent_project = things.get(heading_obj['project'])
            except Exception:
                pass
    
        # Add start/list location with Someday inheritance
        if todo.get('start'):
            effective_start = todo['start']
            if effective_start != 'Someday' and parent_project and parent_project.get('start') == 'Someday':
                effective_start = 'Someday'
                todo_text += f"\nList: {effective_start} (inherited from project)"
            else:
                todo_text += f"\nList: {effective_start}"
    
        # Add dates
        if todo.get('start_date'):
            todo_text += f"\nStart Date: {todo['start_date']}"
        if todo.get('deadline'):
            todo_text += f"\nDeadline: {todo['deadline']}"
        if todo.get('stop_date'):  # Completion date
            todo_text += f"\nCompleted: {todo['stop_date']}"
    
        # Add creation and modification dates
        if todo.get('created'):
            todo_text += f"\nCreated: {todo['created']}"
            # Calculate age since creation
            try:
                age_text = _calculate_age(todo['created'])
                todo_text += f"\nAge: {age_text}"
            except (ValueError, TypeError):
                pass
    
        if todo.get('modified'):
            todo_text += f"\nModified: {todo['modified']}"
            # Calculate time since last modification
            try:
                modified_age = _calculate_age(todo['modified'])
                todo_text += f"\nLast modified: {modified_age}"
            except (ValueError, TypeError):
                pass
    
        # Add notes if present
        if todo.get('notes'):
            todo_text += f"\nNotes: {todo['notes']}"
    
        # Add project info if present
        if parent_project:
            todo_text += f"\nProject: {parent_project['title']}"
    
        # Add heading info if present
        if todo.get('heading'):
            try:
                heading = things.get(todo['heading'])
                if heading:
                    todo_text += f"\nHeading: {heading['title']}"
            except Exception:
                pass
    
        # Add area info if present
        if todo.get('area'):
            try:
                area = things.get(todo['area'])
                if area:
                    todo_text += f"\nArea: {area['title']}"
            except Exception:
                pass
    
        # Add tags if present
        if todo.get('tags'):
            todo_text += f"\nTags: {', '.join(todo['tags'])}"
    
        # Add checklist if present and contains items
        if isinstance(todo.get('checklist'), list):
            todo_text += "\nChecklist:"
            for item in todo['checklist']:
                checkbox = "✓" if item.get('status') == 'completed' else "☐"
                todo_text += f"\n  {checkbox} {item['title']}"
    
        return todo_text
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations; description does not disclose read-only nature, side effects, or any behavioral traits beyond the basic operation.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Short and direct, but lacks a typical usage description; could be more structured but not verbose.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Minimal but sufficient given the output schema; however, no info on error behavior or prerequisites.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Describes the 'tag' parameter as 'Tag title to filter by', adding meaning beyond the schema's type-only (string) definition.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Description clearly states it gets items with a specific tag, distinguishing it from sibling tools that retrieve other lists or tag definitions.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance on when to use this tool versus alternatives like get_tags or search_items; no scenarios or exclusions mentioned.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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