diff --git a/.claude/memory/MEMORY.md b/.claude/memory/MEMORY.md
index 951675c..2358fd7 100644
--- a/.claude/memory/MEMORY.md
+++ b/.claude/memory/MEMORY.md
@@ -9,10 +9,12 @@
 - [ACG-5070 Workstation](reference_workstation_setup.md) - Windows 11, replaced CachyOS. SOPS vault, Ollama, all dev tools.
 - [Matomo Analytics](reference_matomo_analytics.md) - Self-hosted analytics at analytics.azcomputerguru.com, site IDs, tracking for all 3 sites
 - [Dataforth Contact - AJ](reference_dataforth_contact.md) - AJ at Dataforth, dataforthgit@ email forwarding to him
+- [TickTick Integration](reference_ticktick_integration.md) - OAuth API integration, MCP server, SOPS vault creds, project/task CRUD
 
 ## Feedback
 - [D2TESTNAS SSH Access](feedback_d2testnas_ssh.md) - Use root@192.168.0.9 with Paper123!@#, not sysadmin
 - [Bypass Permissions Setting](feedback_bypass_permissions_setting.md) - Set permissions.defaultMode to bypassPermissions in settings.json on all machines
+- [365 Remediation Tool](feedback_365_remediation_tool.md) - Always means Graph API app fabb3421, not CIPP
 
 ## Machine
 - [ACG-5070 Workstation Setup](reference_workstation_setup.md) - Windows 11 Pro clean install 2026-03-30, replaced CachyOS. All tools installed.
diff --git a/.claude/memory/reference_ticktick_integration.md b/.claude/memory/reference_ticktick_integration.md
new file mode 100644
index 0000000..e9d9fef
--- /dev/null
+++ b/.claude/memory/reference_ticktick_integration.md
@@ -0,0 +1,33 @@
+---
+name: TickTick Integration
+description: TickTick API integration for project/task management - OAuth credentials in SOPS vault, MCP server, API service
+type: reference
+---
+
+## TickTick Integration (Built 2026-03-31)
+
+**App Name:** ClaudeTools (registered at developer.ticktick.com)
+
+### Credentials
+- SOPS vault: `services/ticktick.sops.yaml`
+- Fields: `credentials.client_id`, `credentials.client_secret`, `credentials.oauth_redirect_url`
+- OAuth tokens: `mcp-servers/ticktick/.tokens.json` (gitignored, auto-refreshed)
+
+### Components
+- **MCP Server:** `mcp-servers/ticktick/ticktick_mcp.py` - 9 tools for Claude Code (registered in `.mcp.json`)
+- **OAuth Auth:** `mcp-servers/ticktick/ticktick_auth.py` - One-time browser auth flow (localhost:9876 callback)
+- **API Service:** `api/services/ticktick_service.py` - Async service, SOPS vault credentials, auto token refresh
+- **API Router:** `api/routers/ticktick.py` - REST at `/api/ticktick/`, JWT-protected
+
+### TickTick API
+- Base URL: `https://api.ticktick.com/open/v1`
+- Auth: OAuth 2.0 Bearer tokens, scopes: `tasks:read tasks:write`
+- No webhooks (must poll), no search endpoint (filter client-side)
+- Priority values: 0=none, 1=low, 3=medium, 5=high (non-sequential)
+- Token endpoint requires `application/x-www-form-urlencoded` (not JSON)
+
+### MCP Tools
+`ticktick_list_projects`, `ticktick_get_project`, `ticktick_create_project`, `ticktick_update_project`, `ticktick_delete_project`, `ticktick_create_task`, `ticktick_update_task`, `ticktick_complete_task`, `ticktick_delete_task`
+
+### Re-auth
+If tokens expire completely, run: `python mcp-servers/ticktick/ticktick_auth.py` from bash (not PowerShell - needs vault access via bash).
diff --git a/.gitignore b/.gitignore
index c5910b8..51edc68 100644
--- a/.gitignore
+++ b/.gitignore
@@ -53,6 +53,7 @@ build/
 *.sqlite
 logs/
 .claude/tokens.json
+**/.tokens.json
 .claude/context-recall-config.env
 .claude/context-recall-config.env.backup
 .claude/context-cache/
diff --git a/api/main.py b/api/main.py
index bef329a..a10a644 100644
--- a/api/main.py
+++ b/api/main.py
@@ -35,6 +35,7 @@ from api.routers import (
     version,
     quotes,
     admin_quotes,
+    ticktick,
 )
 
 # Import middleware
@@ -130,6 +131,9 @@ app.include_router(bulk_import.router, prefix="/api/bulk-import", tags=["Bulk Im
 app.include_router(quotes.router, prefix="/api/quotes", tags=["Quotes"])
 app.include_router(admin_quotes.router, prefix="/api/admin/quotes", tags=["Admin Quotes"])
 
+# External integrations
+app.include_router(ticktick.router, prefix="/api/ticktick", tags=["TickTick"])
+
 
 if __name__ == "__main__":
     import uvicorn
diff --git a/api/routers/ticktick.py b/api/routers/ticktick.py
new file mode 100644
index 0000000..e7a0bb0
--- /dev/null
+++ b/api/routers/ticktick.py
@@ -0,0 +1,333 @@
+"""
+TickTick API router for ClaudeTools.
+
+This module defines REST API endpoints for managing TickTick projects and tasks,
+proxying requests through the TickTickService with automatic token management.
+"""
+
+import logging
+from typing import Optional
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from pydantic import BaseModel, Field
+
+from api.middleware.auth import get_current_user
+from api.services.ticktick_service import TickTickResult, get_ticktick_service
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter()
+
+
+# --------------------------------------------------------------------------
+# Pydantic request/response schemas
+# --------------------------------------------------------------------------
+
+
+class ProjectCreate(BaseModel):
+    """Schema for creating a new TickTick project."""
+
+    name: str = Field(..., min_length=1, max_length=200, description="Project name")
+    color: Optional[str] = Field(
+        None, description="Hex color string (e.g., '#FF6347')"
+    )
+    view_mode: Optional[str] = Field(
+        None, description="View mode: 'list', 'kanban', or 'timeline'"
+    )
+    kind: Optional[str] = Field(
+        None, description="Project kind: 'TASK' or 'NOTE'"
+    )
+
+
+class ProjectUpdate(BaseModel):
+    """Schema for updating an existing TickTick project."""
+
+    name: Optional[str] = Field(
+        None, min_length=1, max_length=200, description="New project name"
+    )
+    color: Optional[str] = Field(None, description="New hex color string")
+    view_mode: Optional[str] = Field(None, description="New view mode")
+
+
+class TaskCreate(BaseModel):
+    """Schema for creating a new task in a TickTick project."""
+
+    title: str = Field(..., min_length=1, max_length=500, description="Task title")
+    content: Optional[str] = Field(None, description="Task description/content")
+    priority: Optional[int] = Field(
+        None,
+        ge=0,
+        le=5,
+        description="Priority: 0=none, 1=low, 3=medium, 5=high",
+    )
+    due_date: Optional[str] = Field(
+        None, description="Due date in ISO 8601 format"
+    )
+    tags: Optional[list[str]] = Field(None, description="List of tag strings")
+
+
+class TaskUpdate(BaseModel):
+    """Schema for updating an existing task."""
+
+    title: Optional[str] = Field(
+        None, min_length=1, max_length=500, description="New task title"
+    )
+    content: Optional[str] = Field(None, description="New task content")
+    priority: Optional[int] = Field(
+        None, ge=0, le=5, description="New priority level"
+    )
+    due_date: Optional[str] = Field(None, description="New due date in ISO 8601 format")
+    tags: Optional[list[str]] = Field(None, description="New list of tags")
+
+
+class TickTickResponse(BaseModel):
+    """Standard response wrapper for all TickTick endpoints."""
+
+    success: bool
+    data: Optional[dict] = None
+    error: Optional[str] = None
+
+
+# --------------------------------------------------------------------------
+# Helpers
+# --------------------------------------------------------------------------
+
+
+def _to_response(result: TickTickResult, status_code_on_error: int = 500) -> dict:
+    """
+    Convert a TickTickResult to a JSON-serializable response dict.
+
+    Raises an HTTPException when the result indicates failure.
+
+    Args:
+        result: The service result to convert.
+        status_code_on_error: HTTP status code for error responses.
+
+    Returns:
+        Dict matching the TickTickResponse schema.
+    """
+    if not result.success:
+        raise HTTPException(
+            status_code=status_code_on_error,
+            detail={
+                "success": False,
+                "data": None,
+                "error": result.error or "Unknown error",
+            },
+        )
+    return {"success": True, "data": result.data, "error": None}
+
+
+# --------------------------------------------------------------------------
+# Project endpoints
+# --------------------------------------------------------------------------
+
+
+@router.get(
+    "",
+    response_model=TickTickResponse,
+    summary="List all TickTick projects",
+    status_code=status.HTTP_200_OK,
+)
+async def list_projects(current_user: dict = Depends(get_current_user)):
+    """
+    Retrieve all projects (lists) from the authenticated TickTick account.
+
+    **Example Request:**
+    ```
+    GET /api/ticktick
+    ```
+    """
+    service = get_ticktick_service()
+    result = await service.list_projects()
+    return _to_response(result)
+
+
+@router.get(
+    "/{project_id}",
+    response_model=TickTickResponse,
+    summary="Get a TickTick project with tasks",
+    status_code=status.HTTP_200_OK,
+)
+async def get_project(project_id: str, current_user: dict = Depends(get_current_user)):
+    """
+    Retrieve a single project and its associated task data.
+
+    **Path Parameters:**
+    - **project_id**: The TickTick project ID.
+    """
+    service = get_ticktick_service()
+    result = await service.get_project(project_id)
+    return _to_response(result, status_code_on_error=404)
+
+
+@router.post(
+    "",
+    response_model=TickTickResponse,
+    summary="Create a new TickTick project",
+    status_code=status.HTTP_201_CREATED,
+)
+async def create_project(body: ProjectCreate, current_user: dict = Depends(get_current_user)):
+    """
+    Create a new project (list) in TickTick.
+
+    **Request Body:**
+    - **name** (required): Project name.
+    - **color**: Hex color string.
+    - **view_mode**: View mode ('list', 'kanban', 'timeline').
+    - **kind**: Project kind ('TASK' or 'NOTE').
+    """
+    service = get_ticktick_service()
+    result = await service.create_project(
+        name=body.name,
+        color=body.color,
+        view_mode=body.view_mode,
+        kind=body.kind,
+    )
+    return _to_response(result, status_code_on_error=400)
+
+
+@router.put(
+    "/{project_id}",
+    response_model=TickTickResponse,
+    summary="Update a TickTick project",
+    status_code=status.HTTP_200_OK,
+)
+async def update_project(project_id: str, body: ProjectUpdate, current_user: dict = Depends(get_current_user)):
+    """
+    Update an existing project's properties.
+
+    **Path Parameters:**
+    - **project_id**: The TickTick project ID to update.
+
+    **Request Body:**
+    At least one field must be provided.
+    """
+    service = get_ticktick_service()
+    result = await service.update_project(
+        project_id=project_id,
+        name=body.name,
+        color=body.color,
+        view_mode=body.view_mode,
+    )
+    return _to_response(result, status_code_on_error=400)
+
+
+@router.delete(
+    "/{project_id}",
+    response_model=TickTickResponse,
+    summary="Delete a TickTick project",
+    status_code=status.HTTP_200_OK,
+)
+async def delete_project(project_id: str, current_user: dict = Depends(get_current_user)):
+    """
+    Delete a project from TickTick.
+
+    **Path Parameters:**
+    - **project_id**: The TickTick project ID to delete.
+    """
+    service = get_ticktick_service()
+    result = await service.delete_project(project_id)
+    return _to_response(result, status_code_on_error=404)
+
+
+# --------------------------------------------------------------------------
+# Task endpoints
+# --------------------------------------------------------------------------
+
+
+@router.post(
+    "/{project_id}/tasks",
+    response_model=TickTickResponse,
+    summary="Create a task in a TickTick project",
+    status_code=status.HTTP_201_CREATED,
+)
+async def create_task(project_id: str, body: TaskCreate, current_user: dict = Depends(get_current_user)):
+    """
+    Create a new task within the specified project.
+
+    **Path Parameters:**
+    - **project_id**: The TickTick project ID.
+
+    **Request Body:**
+    - **title** (required): Task title.
+    - **content**: Task description.
+    - **priority**: 0=none, 1=low, 3=medium, 5=high.
+    - **due_date**: ISO 8601 date string.
+    - **tags**: List of tag strings.
+    """
+    service = get_ticktick_service()
+    result = await service.create_task(
+        title=body.title,
+        project_id=project_id,
+        content=body.content,
+        priority=body.priority,
+        due_date=body.due_date,
+        tags=body.tags,
+    )
+    return _to_response(result, status_code_on_error=400)
+
+
+@router.put(
+    "/{project_id}/tasks/{task_id}",
+    response_model=TickTickResponse,
+    summary="Update a task in a TickTick project",
+    status_code=status.HTTP_200_OK,
+)
+async def update_task(project_id: str, task_id: str, body: TaskUpdate, current_user: dict = Depends(get_current_user)):
+    """
+    Update an existing task's properties.
+
+    **Path Parameters:**
+    - **project_id**: The TickTick project ID.
+    - **task_id**: The task ID to update.
+    """
+    service = get_ticktick_service()
+    result = await service.update_task(
+        task_id=task_id,
+        project_id=project_id,
+        title=body.title,
+        content=body.content,
+        priority=body.priority,
+        due_date=body.due_date,
+        tags=body.tags,
+    )
+    return _to_response(result, status_code_on_error=400)
+
+
+@router.post(
+    "/{project_id}/tasks/{task_id}/complete",
+    response_model=TickTickResponse,
+    summary="Complete a task",
+    status_code=status.HTTP_200_OK,
+)
+async def complete_task(project_id: str, task_id: str, current_user: dict = Depends(get_current_user)):
+    """
+    Mark a task as complete in TickTick.
+
+    **Path Parameters:**
+    - **project_id**: The TickTick project ID.
+    - **task_id**: The task ID to mark complete.
+    """
+    service = get_ticktick_service()
+    result = await service.complete_task(task_id=task_id, project_id=project_id)
+    return _to_response(result, status_code_on_error=400)
+
+
+@router.delete(
+    "/{project_id}/tasks/{task_id}",
+    response_model=TickTickResponse,
+    summary="Delete a task",
+    status_code=status.HTTP_200_OK,
+)
+async def delete_task(project_id: str, task_id: str, current_user: dict = Depends(get_current_user)):
+    """
+    Delete a task from a TickTick project.
+
+    **Path Parameters:**
+    - **project_id**: The TickTick project ID.
+    - **task_id**: The task ID to delete.
+    """
+    service = get_ticktick_service()
+    result = await service.delete_task(task_id=task_id, project_id=project_id)
+    return _to_response(result, status_code_on_error=404)
diff --git a/api/services/ticktick_service.py b/api/services/ticktick_service.py
new file mode 100644
index 0000000..4eacdb6
--- /dev/null
+++ b/api/services/ticktick_service.py
@@ -0,0 +1,596 @@
+"""
+TickTick API integration service for ClaudeTools.
+
+This module handles all interactions with the TickTick Open API for project
+and task management. Tokens are managed via a local JSON file with automatic
+refresh on 401 responses.
+
+API Documentation: https://developer.ticktick.com/api
+"""
+
+import json
+import logging
+import subprocess
+from dataclasses import dataclass
+from pathlib import Path
+from typing import Optional
+
+import httpx
+
+logger = logging.getLogger(__name__)
+
+TICKTICK_API_BASE_URL = "https://api.ticktick.com/open/v1"
+TICKTICK_TOKEN_URL = "https://ticktick.com/oauth/token"
+TICKTICK_TOKEN_FILE = Path(__file__).resolve().parents[2] / "mcp-servers" / "ticktick" / ".tokens.json"
+
+VAULT_SCRIPT = "D:/vault/scripts/vault.sh"
+VAULT_ENTRY = "services/ticktick.sops.yaml"
+
+TICKTICK_TIMEOUT_SECONDS = 30.0
+TICKTICK_CONNECT_TIMEOUT_SECONDS = 10.0
+
+
+@dataclass
+class TickTickResult:
+    """Result wrapper for all TickTick API operations."""
+
+    success: bool
+    data: Optional[dict] = None
+    error: Optional[str] = None
+
+
+def _vault_get_field(field: str) -> str:
+    """Retrieve a single field from the SOPS vault entry."""
+    try:
+        result = subprocess.run(
+            ["bash", VAULT_SCRIPT, "get-field", VAULT_ENTRY, field],
+            capture_output=True,
+            text=True,
+            timeout=15,
+        )
+        if result.returncode == 0 and result.stdout.strip():
+            return result.stdout.strip()
+        logger.error("[ERROR] Vault returned empty or error for %s", field)
+        return ""
+    except (FileNotFoundError, subprocess.TimeoutExpired) as exc:
+        logger.error("[ERROR] Vault retrieval failed for %s: %s", field, exc)
+        return ""
+
+
+class TickTickService:
+    """
+    Service for interacting with the TickTick Open API.
+
+    Handles project and task CRUD operations with automatic OAuth token
+    refresh when the access token expires. Credentials are retrieved from
+    the SOPS vault.
+    """
+
+    def __init__(
+        self,
+        api_base_url: str = TICKTICK_API_BASE_URL,
+        token_file: Path = TICKTICK_TOKEN_FILE,
+        timeout: float = TICKTICK_TIMEOUT_SECONDS,
+        connect_timeout: float = TICKTICK_CONNECT_TIMEOUT_SECONDS,
+    ):
+        self.api_base_url = api_base_url.rstrip("/")
+        self.token_file = token_file
+        self.timeout = httpx.Timeout(timeout, connect=connect_timeout)
+        self._access_token: Optional[str] = None
+        self._refresh_token: Optional[str] = None
+        self._client_id: Optional[str] = None
+        self._client_secret: Optional[str] = None
+        self._load_tokens()
+
+    # ------------------------------------------------------------------
+    # Token management
+    # ------------------------------------------------------------------
+
+    def _load_tokens(self) -> None:
+        """Load access and refresh tokens from the local token file."""
+        if not self.token_file.exists():
+            logger.warning(
+                "[WARNING] TickTick token file not found at %s", self.token_file
+            )
+            return
+
+        try:
+            data = json.loads(self.token_file.read_text(encoding="utf-8"))
+            self._access_token = data.get("access_token")
+            self._refresh_token = data.get("refresh_token")
+            logger.info("[OK] TickTick tokens loaded from %s", self.token_file)
+        except (json.JSONDecodeError, OSError) as exc:
+            logger.error(
+                "[ERROR] Failed to read TickTick token file: %s", exc
+            )
+
+    def _save_tokens(self) -> None:
+        """Persist current tokens back to the token file."""
+        try:
+            existing: dict = {}
+            if self.token_file.exists():
+                try:
+                    existing = json.loads(
+                        self.token_file.read_text(encoding="utf-8")
+                    )
+                except (json.JSONDecodeError, OSError):
+                    existing = {}
+
+            existing["access_token"] = self._access_token
+            existing["refresh_token"] = self._refresh_token
+
+            self.token_file.write_text(
+                json.dumps(existing, indent=2) + "\n", encoding="utf-8"
+            )
+            logger.info("[OK] TickTick tokens saved to %s", self.token_file)
+        except OSError as exc:
+            logger.error(
+                "[ERROR] Failed to write TickTick token file: %s", exc
+            )
+
+    async def _refresh_access_token(self) -> bool:
+        """
+        Refresh the OAuth access token using the stored refresh token.
+
+        Returns:
+            True if the token was refreshed successfully, False otherwise.
+        """
+        if not self._refresh_token:
+            logger.error("[ERROR] No refresh token available for TickTick")
+            return False
+
+        # Lazy-load vault credentials for refresh
+        if not self._client_id:
+            self._client_id = _vault_get_field("credentials.client_id")
+        if not self._client_secret:
+            self._client_secret = _vault_get_field("credentials.client_secret")
+
+        if not self._client_id or not self._client_secret:
+            logger.error(
+                "[ERROR] Could not retrieve TickTick client credentials from SOPS vault"
+            )
+            return False
+
+        logger.info("[INFO] Refreshing TickTick access token")
+
+        try:
+            async with httpx.AsyncClient(timeout=self.timeout) as client:
+                response = await client.post(
+                    TICKTICK_TOKEN_URL,
+                    headers={
+                        "Content-Type": "application/x-www-form-urlencoded",
+                    },
+                    data={
+                        "grant_type": "refresh_token",
+                        "refresh_token": self._refresh_token,
+                        "client_id": self._client_id,
+                        "client_secret": self._client_secret,
+                    },
+                )
+
+            if response.status_code != 200:
+                logger.error(
+                    "[ERROR] TickTick token refresh failed with status %d: %s",
+                    response.status_code,
+                    response.text,
+                )
+                return False
+
+            token_data = response.json()
+            self._access_token = token_data.get("access_token")
+            if "refresh_token" in token_data:
+                self._refresh_token = token_data["refresh_token"]
+
+            self._save_tokens()
+            logger.info("[OK] TickTick access token refreshed successfully")
+            return True
+
+        except httpx.HTTPError as exc:
+            logger.error(
+                "[ERROR] TickTick token refresh request failed: %s", exc
+            )
+            return False
+
+    # ------------------------------------------------------------------
+    # HTTP helpers
+    # ------------------------------------------------------------------
+
+    def _get_client(self) -> httpx.AsyncClient:
+        """
+        Create an async HTTP client with configured settings.
+
+        Returns:
+            Configured httpx.AsyncClient for TickTick API calls.
+        """
+        headers = {
+            "Content-Type": "application/json",
+            "Accept": "application/json",
+        }
+        if self._access_token:
+            headers["Authorization"] = f"Bearer {self._access_token}"
+
+        return httpx.AsyncClient(timeout=self.timeout, headers=headers)
+
+    async def _request(
+        self,
+        method: str,
+        endpoint: str,
+        json_body: Optional[dict] = None,
+        retry_on_401: bool = True,
+    ) -> TickTickResult:
+        """
+        Execute an API request with automatic 401 retry after token refresh.
+
+        Args:
+            method: HTTP method (GET, POST, PUT, DELETE).
+            endpoint: API path relative to the base URL (e.g., '/project').
+            json_body: Optional JSON payload for POST/PUT requests.
+            retry_on_401: Whether to attempt a token refresh on 401.
+
+        Returns:
+            TickTickResult with success status and response data or error.
+        """
+        url = f"{self.api_base_url}{endpoint}"
+
+        try:
+            async with self._get_client() as client:
+                response = await client.request(
+                    method, url, json=json_body
+                )
+
+            if response.status_code == 401 and retry_on_401:
+                logger.info(
+                    "[INFO] TickTick API returned 401, attempting token refresh"
+                )
+                refreshed = await self._refresh_access_token()
+                if refreshed:
+                    return await self._request(
+                        method, endpoint, json_body, retry_on_401=False
+                    )
+                return TickTickResult(
+                    success=False,
+                    error="Authentication failed and token refresh was unsuccessful",
+                )
+
+            if response.status_code == 204:
+                return TickTickResult(success=True, data={})
+
+            if response.status_code >= 400:
+                error_text = response.text
+                logger.error(
+                    "[ERROR] TickTick API %s %s returned %d: %s",
+                    method,
+                    endpoint,
+                    response.status_code,
+                    error_text,
+                )
+                return TickTickResult(
+                    success=False,
+                    error=f"API returned {response.status_code}: {error_text}",
+                )
+
+            # Some responses may have empty bodies (e.g., 200 with no content)
+            if not response.text.strip():
+                return TickTickResult(success=True, data={})
+
+            return TickTickResult(success=True, data=response.json())
+
+        except httpx.HTTPError as exc:
+            logger.error(
+                "[ERROR] TickTick API request failed (%s %s): %s",
+                method,
+                endpoint,
+                exc,
+            )
+            return TickTickResult(
+                success=False, error=f"Request failed: {exc}"
+            )
+        except json.JSONDecodeError as exc:
+            logger.error(
+                "[ERROR] TickTick API returned invalid JSON (%s %s): %s",
+                method,
+                endpoint,
+                exc,
+            )
+            return TickTickResult(
+                success=False, error=f"Invalid JSON in response: {exc}"
+            )
+
+    # ------------------------------------------------------------------
+    # Project operations
+    # ------------------------------------------------------------------
+
+    async def list_projects(self) -> TickTickResult:
+        """
+        List all projects (lists) in the TickTick account.
+
+        Returns:
+            TickTickResult with data containing a list of project dicts.
+        """
+        logger.info("[INFO] Fetching TickTick project list")
+        result = await self._request("GET", "/project")
+        if result.success and isinstance(result.data, list):
+            result.data = {"projects": result.data}
+        return result
+
+    async def get_project(self, project_id: str) -> TickTickResult:
+        """
+        Get a single project with its task data.
+
+        Args:
+            project_id: The TickTick project ID.
+
+        Returns:
+            TickTickResult with the project data including tasks.
+        """
+        if not project_id:
+            return TickTickResult(success=False, error="project_id is required")
+
+        logger.info("[INFO] Fetching TickTick project %s", project_id)
+        result = await self._request("GET", f"/project/{project_id}/data")
+        return result
+
+    async def create_project(
+        self,
+        name: str,
+        color: Optional[str] = None,
+        view_mode: Optional[str] = None,
+        kind: Optional[str] = None,
+    ) -> TickTickResult:
+        """
+        Create a new project (list) in TickTick.
+
+        Args:
+            name: Project name.
+            color: Optional hex color string (e.g., '#FF6347').
+            view_mode: Optional view mode ('list', 'kanban', 'timeline').
+            kind: Optional project kind ('TASK' or 'NOTE').
+
+        Returns:
+            TickTickResult with the created project data.
+        """
+        if not name:
+            return TickTickResult(success=False, error="name is required")
+
+        body: dict = {"name": name}
+        if color is not None:
+            body["color"] = color
+        if view_mode is not None:
+            body["viewMode"] = view_mode
+        if kind is not None:
+            body["kind"] = kind
+
+        logger.info("[INFO] Creating TickTick project: %s", name)
+        return await self._request("POST", "/project", json_body=body)
+
+    async def update_project(
+        self,
+        project_id: str,
+        name: Optional[str] = None,
+        color: Optional[str] = None,
+        view_mode: Optional[str] = None,
+    ) -> TickTickResult:
+        """
+        Update an existing project in TickTick.
+
+        Args:
+            project_id: The TickTick project ID to update.
+            name: Optional new project name.
+            color: Optional new hex color string.
+            view_mode: Optional new view mode.
+
+        Returns:
+            TickTickResult with the updated project data.
+        """
+        if not project_id:
+            return TickTickResult(success=False, error="project_id is required")
+
+        body: dict = {}
+        if name is not None:
+            body["name"] = name
+        if color is not None:
+            body["color"] = color
+        if view_mode is not None:
+            body["viewMode"] = view_mode
+
+        if not body:
+            return TickTickResult(
+                success=False, error="At least one field to update is required"
+            )
+
+        logger.info("[INFO] Updating TickTick project %s", project_id)
+        return await self._request(
+            "POST", f"/project/{project_id}", json_body=body
+        )
+
+    async def delete_project(self, project_id: str) -> TickTickResult:
+        """
+        Delete a project from TickTick.
+
+        Args:
+            project_id: The TickTick project ID to delete.
+
+        Returns:
+            TickTickResult with success status.
+        """
+        if not project_id:
+            return TickTickResult(success=False, error="project_id is required")
+
+        logger.info("[INFO] Deleting TickTick project %s", project_id)
+        return await self._request("DELETE", f"/project/{project_id}")
+
+    # ------------------------------------------------------------------
+    # Task operations
+    # ------------------------------------------------------------------
+
+    async def create_task(
+        self,
+        title: str,
+        project_id: str,
+        content: Optional[str] = None,
+        priority: Optional[int] = None,
+        due_date: Optional[str] = None,
+        tags: Optional[list[str]] = None,
+    ) -> TickTickResult:
+        """
+        Create a new task in a TickTick project.
+
+        Args:
+            title: Task title.
+            project_id: ID of the project to create the task in.
+            content: Optional task description/content.
+            priority: Optional priority (0=none, 1=low, 3=medium, 5=high).
+            due_date: Optional due date in ISO 8601 format.
+            tags: Optional list of tag strings.
+
+        Returns:
+            TickTickResult with the created task data.
+        """
+        if not title:
+            return TickTickResult(success=False, error="title is required")
+        if not project_id:
+            return TickTickResult(success=False, error="project_id is required")
+
+        body: dict = {"title": title, "projectId": project_id}
+        if content is not None:
+            body["content"] = content
+        if priority is not None:
+            body["priority"] = priority
+        if due_date is not None:
+            body["dueDate"] = due_date
+        if tags is not None:
+            body["tags"] = tags
+
+        logger.info(
+            "[INFO] Creating TickTick task '%s' in project %s",
+            title,
+            project_id,
+        )
+        return await self._request("POST", "/task", json_body=body)
+
+    async def update_task(
+        self,
+        task_id: str,
+        project_id: str,
+        title: Optional[str] = None,
+        content: Optional[str] = None,
+        priority: Optional[int] = None,
+        due_date: Optional[str] = None,
+        tags: Optional[list[str]] = None,
+    ) -> TickTickResult:
+        """
+        Update an existing task in TickTick.
+
+        Args:
+            task_id: The task ID to update.
+            project_id: The project ID containing the task.
+            title: Optional new task title.
+            content: Optional new task content.
+            priority: Optional new priority level.
+            due_date: Optional new due date in ISO 8601 format.
+            tags: Optional new list of tags.
+
+        Returns:
+            TickTickResult with the updated task data.
+        """
+        if not task_id:
+            return TickTickResult(success=False, error="task_id is required")
+        if not project_id:
+            return TickTickResult(success=False, error="project_id is required")
+
+        body: dict = {"id": task_id, "projectId": project_id}
+        if title is not None:
+            body["title"] = title
+        if content is not None:
+            body["content"] = content
+        if priority is not None:
+            body["priority"] = priority
+        if due_date is not None:
+            body["dueDate"] = due_date
+        if tags is not None:
+            body["tags"] = tags
+
+        logger.info(
+            "[INFO] Updating TickTick task %s in project %s",
+            task_id,
+            project_id,
+        )
+        return await self._request(
+            "POST", f"/task/{task_id}", json_body=body
+        )
+
+    async def complete_task(
+        self, task_id: str, project_id: str
+    ) -> TickTickResult:
+        """
+        Mark a task as complete in TickTick.
+
+        Args:
+            task_id: The task ID to complete.
+            project_id: The project ID containing the task.
+
+        Returns:
+            TickTickResult with success status.
+        """
+        if not task_id:
+            return TickTickResult(success=False, error="task_id is required")
+        if not project_id:
+            return TickTickResult(success=False, error="project_id is required")
+
+        logger.info(
+            "[INFO] Completing TickTick task %s in project %s",
+            task_id,
+            project_id,
+        )
+        return await self._request(
+            "POST", f"/project/{project_id}/task/{task_id}/complete"
+        )
+
+    async def delete_task(
+        self, task_id: str, project_id: str
+    ) -> TickTickResult:
+        """
+        Delete a task from TickTick.
+
+        Args:
+            task_id: The task ID to delete.
+            project_id: The project ID containing the task.
+
+        Returns:
+            TickTickResult with success status.
+        """
+        if not task_id:
+            return TickTickResult(success=False, error="task_id is required")
+        if not project_id:
+            return TickTickResult(success=False, error="project_id is required")
+
+        logger.info(
+            "[INFO] Deleting TickTick task %s from project %s",
+            task_id,
+            project_id,
+        )
+        return await self._request(
+            "DELETE", f"/project/{project_id}/task/{task_id}"
+        )
+
+
+# --------------------------------------------------------------------------
+# Singleton accessor
+# --------------------------------------------------------------------------
+
+_ticktick_service: Optional[TickTickService] = None
+
+
+def get_ticktick_service() -> TickTickService:
+    """
+    Return a singleton TickTickService instance.
+
+    Creates the service on first call, reuses it thereafter.
+
+    Returns:
+        The shared TickTickService instance.
+    """
+    global _ticktick_service
+    if _ticktick_service is None:
+        _ticktick_service = TickTickService()
+    return _ticktick_service
diff --git a/mcp-servers/ticktick/ticktick_auth.py b/mcp-servers/ticktick/ticktick_auth.py
new file mode 100644
index 0000000..4f69895
--- /dev/null
+++ b/mcp-servers/ticktick/ticktick_auth.py
@@ -0,0 +1,313 @@
+#!/usr/bin/env python3
+"""
+TickTick OAuth 2.0 Authentication Script
+
+Performs the one-time OAuth flow to obtain access and refresh tokens from TickTick.
+Reads client credentials from the SOPS vault, opens a browser for user authorization,
+captures the callback on a local HTTP server, exchanges the code for tokens, and
+saves them to an encrypted local file.
+
+Usage:
+    python ticktick_auth.py
+"""
+
+import json
+import os
+import secrets
+import stat
+import subprocess
+import sys
+import threading
+import time
+import webbrowser
+from datetime import datetime, timezone
+from http.server import HTTPServer, BaseHTTPRequestHandler
+from pathlib import Path
+from urllib.parse import urlencode, urlparse, parse_qs
+from urllib.request import Request, urlopen
+from html import escape as html_escape
+from urllib.error import URLError, HTTPError
+
+# ---------------------------------------------------------------------------
+# Configuration
+# ---------------------------------------------------------------------------
+
+VAULT_SCRIPT = "D:/vault/scripts/vault.sh"
+VAULT_ENTRY = "services/ticktick.sops.yaml"
+
+AUTH_URL = "https://ticktick.com/oauth/authorize"
+TOKEN_URL = "https://ticktick.com/oauth/token"
+REDIRECT_URI = "http://localhost:9876/callback"
+SCOPES = "tasks:read tasks:write"
+CALLBACK_PORT = 9876
+CALLBACK_TIMEOUT_SECONDS = 60
+
+TOKEN_FILE = Path(__file__).resolve().parent / ".tokens.json"
+
+
+# ---------------------------------------------------------------------------
+# Vault credential retrieval
+# ---------------------------------------------------------------------------
+
+def vault_get_field(field: str) -> str:
+    """Retrieve a single field from the SOPS vault entry."""
+    try:
+        result = subprocess.run(
+            ["bash", VAULT_SCRIPT, "get-field", VAULT_ENTRY, field],
+            capture_output=True,
+            text=True,
+            timeout=15,
+        )
+    except FileNotFoundError:
+        print(f"[ERROR] Could not find bash or vault script at {VAULT_SCRIPT}")
+        sys.exit(1)
+    except subprocess.TimeoutExpired:
+        print(f"[ERROR] Vault command timed out while retrieving {field}")
+        sys.exit(1)
+
+    if result.returncode != 0:
+        stderr = result.stderr.strip()
+        print(f"[ERROR] Vault returned non-zero exit code for field '{field}'")
+        if stderr:
+            print(f"        {stderr}")
+        sys.exit(1)
+
+    value = result.stdout.strip()
+    if not value:
+        print(f"[ERROR] Vault returned empty value for field '{field}'")
+        sys.exit(1)
+
+    return value
+
+
+# ---------------------------------------------------------------------------
+# Callback HTTP server
+# ---------------------------------------------------------------------------
+
+class _CallbackState:
+    """Shared mutable state between the HTTP handler and the main thread."""
+
+    def __init__(self) -> None:
+        self.authorization_code: str | None = None
+        self.error: str | None = None
+        self.received = threading.Event()
+
+
+class _CallbackHandler(BaseHTTPRequestHandler):
+    """Handles the OAuth redirect callback from TickTick."""
+
+    state: _CallbackState  # set on the class before the server starts
+    expected_csrf: str      # set on the class before the server starts
+
+    def do_GET(self) -> None:  # noqa: N802 – required method name
+        parsed = urlparse(self.path)
+        if parsed.path != "/callback":
+            self._respond(404, "Not found")
+            return
+
+        params = parse_qs(parsed.query)
+
+        # Check for error response from provider
+        if "error" in params:
+            error_msg = params["error"][0]
+            description = params.get("error_description", [""])[0]
+            self.state.error = f"{error_msg}: {description}" if description else error_msg
+            self._respond(400, f"Authorization failed: {self.state.error}")
+            self.state.received.set()
+            return
+
+        # Validate CSRF state parameter
+        returned_state = params.get("state", [None])[0]
+        if returned_state != self.expected_csrf:
+            self.state.error = "CSRF state mismatch -- possible request forgery"
+            self._respond(400, self.state.error)
+            self.state.received.set()
+            return
+
+        # Extract authorization code
+        code = params.get("code", [None])[0]
+        if not code:
+            self.state.error = "No authorization code in callback"
+            self._respond(400, self.state.error)
+            self.state.received.set()
+            return
+
+        self.state.authorization_code = code
+        self._respond(
+            200,
+            "Authorization successful! You can close this tab and return to the terminal.",
+        )
+        self.state.received.set()
+
+    def _respond(self, status: int, body: str) -> None:
+        self.send_response(status)
+        self.send_header("Content-Type", "text/html; charset=utf-8")
+        self.end_headers()
+        html = (
+            "<!DOCTYPE html><html><head><title>TickTick Auth</title></head>"
+            f"<body><h2>{html_escape(body)}</h2></body></html>"
+        )
+        self.wfile.write(html.encode("utf-8"))
+
+    # Silence default request logging
+    def log_message(self, format: str, *args: object) -> None:  # noqa: A002
+        pass
+
+
+# ---------------------------------------------------------------------------
+# Token exchange
+# ---------------------------------------------------------------------------
+
+def exchange_code_for_tokens(
+    code: str,
+    client_id: str,
+    client_secret: str,
+) -> dict:
+    """Exchange an authorization code for access and refresh tokens."""
+    body = urlencode({
+        "grant_type": "authorization_code",
+        "code": code,
+        "redirect_uri": REDIRECT_URI,
+        "client_id": client_id,
+        "client_secret": client_secret,
+        "scope": SCOPES,
+    }).encode("utf-8")
+
+    request = Request(
+        TOKEN_URL,
+        data=body,
+        headers={
+            "Content-Type": "application/x-www-form-urlencoded",
+            "Accept": "application/json",
+        },
+        method="POST",
+    )
+
+    try:
+        with urlopen(request, timeout=15) as response:
+            data = json.loads(response.read().decode("utf-8"))
+    except HTTPError as exc:
+        error_body = exc.read().decode("utf-8", errors="replace")
+        print(f"[ERROR] Token exchange failed (HTTP {exc.code})")
+        print(f"        Response: {error_body}")
+        sys.exit(1)
+    except URLError as exc:
+        print(f"[ERROR] Could not reach token endpoint: {exc.reason}")
+        sys.exit(1)
+    except json.JSONDecodeError:
+        print("[ERROR] Token endpoint returned invalid JSON")
+        sys.exit(1)
+
+    if "access_token" not in data:
+        print("[ERROR] Token response missing 'access_token'")
+        print(f"        Full response: {json.dumps(data, indent=2)}")
+        sys.exit(1)
+
+    return data
+
+
+# ---------------------------------------------------------------------------
+# Token persistence
+# ---------------------------------------------------------------------------
+
+def save_tokens(token_data: dict) -> None:
+    """Persist tokens to a local JSON file."""
+    payload = {
+        "access_token": token_data["access_token"],
+        "refresh_token": token_data.get("refresh_token", ""),
+        "token_type": token_data.get("token_type", "bearer"),
+        "obtained_at": datetime.now(timezone.utc).isoformat(),
+    }
+
+    TOKEN_FILE.parent.mkdir(parents=True, exist_ok=True)
+    TOKEN_FILE.write_text(json.dumps(payload, indent=2), encoding="utf-8")
+    # Restrict file permissions (owner read/write only)
+    try:
+        TOKEN_FILE.chmod(stat.S_IRUSR | stat.S_IWUSR)
+    except OSError:
+        pass  # Windows may not support POSIX permissions
+    print(f"[OK] Tokens saved to {TOKEN_FILE}")
+
+
+# ---------------------------------------------------------------------------
+# Main flow
+# ---------------------------------------------------------------------------
+
+def main() -> None:
+    print("[INFO] TickTick OAuth 2.0 Authentication")
+    print("=" * 50)
+
+    # -- 1. Read credentials from SOPS vault ----------------------------------
+    print("[INFO] Reading credentials from SOPS vault ...")
+    client_id = vault_get_field("credentials.client_id")
+    client_secret = vault_get_field("credentials.client_secret")
+    print(f"[OK] Client ID retrieved (ends ...{client_id[-4:]})")
+
+    # -- 2. Prepare CSRF state and authorization URL --------------------------
+    csrf_state = secrets.token_urlsafe(32)
+
+    auth_params = urlencode({
+        "client_id": client_id,
+        "redirect_uri": REDIRECT_URI,
+        "response_type": "code",
+        "scope": SCOPES,
+        "state": csrf_state,
+    })
+    full_auth_url = f"{AUTH_URL}?{auth_params}"
+
+    # -- 3. Start local callback server ---------------------------------------
+    callback_state = _CallbackState()
+    _CallbackHandler.state = callback_state
+    _CallbackHandler.expected_csrf = csrf_state
+
+    try:
+        server = HTTPServer(("127.0.0.1", CALLBACK_PORT), _CallbackHandler)
+    except OSError as exc:
+        print(f"[ERROR] Could not start callback server on port {CALLBACK_PORT}: {exc}")
+        sys.exit(1)
+
+    server_thread = threading.Thread(target=server.serve_forever, daemon=True)
+    server_thread.start()
+    print(f"[OK] Callback server listening on http://127.0.0.1:{CALLBACK_PORT}/callback")
+
+    # -- 4. Open browser for authorization ------------------------------------
+    print("[INFO] Opening browser for TickTick authorization ...")
+    print(f"[INFO] If the browser does not open, visit this URL manually:")
+    print(f"       {full_auth_url}")
+    webbrowser.open(full_auth_url)
+
+    # -- 5. Wait for callback -------------------------------------------------
+    print(f"[INFO] Waiting up to {CALLBACK_TIMEOUT_SECONDS}s for authorization callback ...")
+    received = callback_state.received.wait(timeout=CALLBACK_TIMEOUT_SECONDS)
+    server.shutdown()
+
+    if not received:
+        print(f"[ERROR] Timed out after {CALLBACK_TIMEOUT_SECONDS}s waiting for callback")
+        print("        Make sure you completed the authorization in your browser.")
+        sys.exit(1)
+
+    if callback_state.error:
+        print(f"[ERROR] Authorization failed: {callback_state.error}")
+        sys.exit(1)
+
+    code = callback_state.authorization_code
+    if not code:
+        print("[ERROR] No authorization code received (unknown error)")
+        sys.exit(1)
+
+    print("[OK] Authorization code received")
+
+    # -- 6. Exchange code for tokens ------------------------------------------
+    print("[INFO] Exchanging authorization code for tokens ...")
+    token_data = exchange_code_for_tokens(code, client_id, client_secret)
+    print("[OK] Token exchange successful")
+
+    # -- 7. Save tokens -------------------------------------------------------
+    save_tokens(token_data)
+
+    print("=" * 50)
+    print("[OK] TickTick authentication complete")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/mcp-servers/ticktick/ticktick_mcp.py b/mcp-servers/ticktick/ticktick_mcp.py
new file mode 100644
index 0000000..420583d
--- /dev/null
+++ b/mcp-servers/ticktick/ticktick_mcp.py
@@ -0,0 +1,595 @@
+#!/usr/bin/env python3
+"""
+TickTick MCP Server
+Provides Claude Code with direct tools to manage TickTick projects and tasks.
+
+Requires:
+  - pip install mcp httpx
+  - Token file at .tokens.json (run ticktick_auth.py first)
+  - Vault credentials at services/ticktick.sops.yaml
+"""
+
+import asyncio
+import json
+import subprocess
+import sys
+import time
+from pathlib import Path
+from typing import Any, Optional
+
+import httpx
+
+try:
+    from mcp.server import Server
+    from mcp.types import Tool, TextContent
+except ImportError:
+    print("[ERROR] MCP package not installed. Run: pip install mcp", file=sys.stderr)
+    sys.exit(1)
+
+# ---------------------------------------------------------------------------
+# Configuration
+# ---------------------------------------------------------------------------
+
+TICKTICK_API_BASE = "https://api.ticktick.com/open/v1"
+TICKTICK_OAUTH_TOKEN_URL = "https://ticktick.com/oauth/token"
+SCRIPT_DIR = Path(__file__).parent
+TOKENS_PATH = SCRIPT_DIR / ".tokens.json"
+VAULT_SCRIPT = "D:/vault/scripts/vault.sh"
+VAULT_ENTRY = "services/ticktick.sops.yaml"
+
+# ---------------------------------------------------------------------------
+# Credential & token helpers
+# ---------------------------------------------------------------------------
+
+_vault_cache: dict[str, str] = {}
+
+
+def _vault_get_field(field: str) -> str:
+    """Retrieve a field from the SOPS vault, caching results in memory."""
+    if field in _vault_cache:
+        return _vault_cache[field]
+    result = subprocess.run(
+        ["bash", VAULT_SCRIPT, "get-field", VAULT_ENTRY, field],
+        capture_output=True,
+        text=True,
+        timeout=15,
+    )
+    if result.returncode != 0:
+        raise RuntimeError(
+            f"[ERROR] Vault lookup failed for {field}: {result.stderr.strip()}"
+        )
+    value = result.stdout.strip()
+    _vault_cache[field] = value
+    return value
+
+
+def _load_tokens() -> dict[str, str]:
+    """Load tokens from disk. Raises FileNotFoundError if missing."""
+    if not TOKENS_PATH.exists():
+        raise FileNotFoundError(
+            f"[ERROR] Token file not found at {TOKENS_PATH}. "
+            "Run 'python ticktick_auth.py' in the ticktick directory first "
+            "to complete the OAuth flow and generate .tokens.json."
+        )
+    with open(TOKENS_PATH, "r", encoding="utf-8") as fh:
+        return json.load(fh)
+
+
+def _save_tokens(tokens: dict[str, str]) -> None:
+    """Persist tokens to disk."""
+    with open(TOKENS_PATH, "w", encoding="utf-8") as fh:
+        json.dump(tokens, fh, indent=2)
+
+
+async def _refresh_access_token(refresh_token: str) -> dict[str, str]:
+    """Exchange a refresh token for a new access token."""
+    client_id = _vault_get_field("credentials.client_id")
+    client_secret = _vault_get_field("credentials.client_secret")
+
+    async with httpx.AsyncClient(timeout=30.0) as client:
+        resp = await client.post(
+            TICKTICK_OAUTH_TOKEN_URL,
+            headers={"Content-Type": "application/x-www-form-urlencoded"},
+            data={
+                "client_id": client_id,
+                "client_secret": client_secret,
+                "refresh_token": refresh_token,
+                "grant_type": "refresh_token",
+            },
+        )
+        if resp.status_code != 200:
+            raise RuntimeError(
+                f"[ERROR] Token refresh failed ({resp.status_code}): {resp.text}"
+            )
+        new_data = resp.json()
+
+    tokens = {
+        "access_token": new_data["access_token"],
+        "refresh_token": new_data.get("refresh_token", refresh_token),
+        "token_type": new_data.get("token_type", "bearer"),
+        "obtained_at": time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime()),
+    }
+    _save_tokens(tokens)
+    return tokens
+
+
+# ---------------------------------------------------------------------------
+# HTTP helper with automatic 401 retry
+# ---------------------------------------------------------------------------
+
+
+async def _ticktick_request(
+    method: str,
+    path: str,
+    *,
+    json_body: Optional[dict] = None,
+) -> httpx.Response:
+    """
+    Make an authenticated request to the TickTick API.
+
+    On a 401 response, automatically refreshes the access token and retries
+    the request exactly once.
+    """
+    tokens = _load_tokens()
+
+    async with httpx.AsyncClient(timeout=30.0) as client:
+        url = f"{TICKTICK_API_BASE}{path}"
+        headers = {"Authorization": f"Bearer {tokens['access_token']}"}
+        kwargs: dict[str, Any] = {"headers": headers}
+        if json_body is not None:
+            kwargs["json"] = json_body
+
+        resp = await client.request(method, url, **kwargs)
+
+        if resp.status_code == 401:
+            # Attempt token refresh and retry once
+            tokens = await _refresh_access_token(tokens["refresh_token"])
+            headers = {"Authorization": f"Bearer {tokens['access_token']}"}
+            kwargs["headers"] = headers
+            resp = await client.request(method, url, **kwargs)
+
+        return resp
+
+
+def _format_response(data: Any) -> str:
+    """Serialize a response payload to pretty JSON text."""
+    if isinstance(data, (dict, list)):
+        return json.dumps(data, indent=2, ensure_ascii=False)
+    return str(data)
+
+
+def _error_text(msg: str) -> list[TextContent]:
+    return [TextContent(type="text", text=msg)]
+
+
+# ---------------------------------------------------------------------------
+# MCP Server
+# ---------------------------------------------------------------------------
+
+app = Server("ticktick")
+
+
+@app.list_tools()
+async def list_tools() -> list[Tool]:
+    """Enumerate all TickTick tools."""
+    return [
+        # ----- Projects -----
+        Tool(
+            name="ticktick_list_projects",
+            description="List all TickTick projects. Returns an array of projects with id, name, color, viewMode, and kind.",
+            inputSchema={
+                "type": "object",
+                "properties": {},
+            },
+        ),
+        Tool(
+            name="ticktick_get_project",
+            description="Get a TickTick project and all its tasks by project ID.",
+            inputSchema={
+                "type": "object",
+                "properties": {
+                    "project_id": {
+                        "type": "string",
+                        "description": "The project ID to retrieve",
+                    },
+                },
+                "required": ["project_id"],
+            },
+        ),
+        Tool(
+            name="ticktick_create_project",
+            description="Create a new TickTick project.",
+            inputSchema={
+                "type": "object",
+                "properties": {
+                    "name": {
+                        "type": "string",
+                        "description": "Project name (required)",
+                    },
+                    "color": {
+                        "type": "string",
+                        "description": "Hex color code (e.g. '#ff6347')",
+                    },
+                    "viewMode": {
+                        "type": "string",
+                        "enum": ["list", "kanban", "timeline"],
+                        "description": "View mode for the project",
+                    },
+                    "kind": {
+                        "type": "string",
+                        "enum": ["TASK", "NOTE"],
+                        "description": "Project kind (default TASK)",
+                    },
+                },
+                "required": ["name"],
+            },
+        ),
+        Tool(
+            name="ticktick_update_project",
+            description="Update an existing TickTick project's name, color, or viewMode.",
+            inputSchema={
+                "type": "object",
+                "properties": {
+                    "project_id": {
+                        "type": "string",
+                        "description": "The project ID to update",
+                    },
+                    "name": {
+                        "type": "string",
+                        "description": "New project name",
+                    },
+                    "color": {
+                        "type": "string",
+                        "description": "New hex color code",
+                    },
+                    "viewMode": {
+                        "type": "string",
+                        "enum": ["list", "kanban", "timeline"],
+                        "description": "New view mode",
+                    },
+                },
+                "required": ["project_id"],
+            },
+        ),
+        Tool(
+            name="ticktick_delete_project",
+            description="Delete a TickTick project by ID. This is irreversible.",
+            inputSchema={
+                "type": "object",
+                "properties": {
+                    "project_id": {
+                        "type": "string",
+                        "description": "The project ID to delete",
+                    },
+                },
+                "required": ["project_id"],
+            },
+        ),
+        # ----- Tasks -----
+        Tool(
+            name="ticktick_create_task",
+            description="Create a new task in a TickTick project.",
+            inputSchema={
+                "type": "object",
+                "properties": {
+                    "title": {
+                        "type": "string",
+                        "description": "Task title (required)",
+                    },
+                    "project_id": {
+                        "type": "string",
+                        "description": "Project ID to create the task in (required)",
+                    },
+                    "content": {
+                        "type": "string",
+                        "description": "Task description / notes",
+                    },
+                    "priority": {
+                        "type": "integer",
+                        "enum": [0, 1, 3, 5],
+                        "description": "Priority: 0=none, 1=low, 3=medium, 5=high",
+                    },
+                    "due_date": {
+                        "type": "string",
+                        "description": "Due date in ISO 8601 format (e.g. 2026-04-01T12:00:00+0000)",
+                    },
+                    "tags": {
+                        "type": "array",
+                        "items": {"type": "string"},
+                        "description": "List of tag names to attach",
+                    },
+                },
+                "required": ["title", "project_id"],
+            },
+        ),
+        Tool(
+            name="ticktick_update_task",
+            description="Update an existing task's title, content, priority, due date, or tags.",
+            inputSchema={
+                "type": "object",
+                "properties": {
+                    "task_id": {
+                        "type": "string",
+                        "description": "The task ID to update",
+                    },
+                    "project_id": {
+                        "type": "string",
+                        "description": "The project ID the task belongs to",
+                    },
+                    "title": {
+                        "type": "string",
+                        "description": "New task title",
+                    },
+                    "content": {
+                        "type": "string",
+                        "description": "New task description / notes",
+                    },
+                    "priority": {
+                        "type": "integer",
+                        "enum": [0, 1, 3, 5],
+                        "description": "New priority: 0=none, 1=low, 3=medium, 5=high",
+                    },
+                    "due_date": {
+                        "type": "string",
+                        "description": "New due date in ISO 8601 format",
+                    },
+                    "tags": {
+                        "type": "array",
+                        "items": {"type": "string"},
+                        "description": "Replacement list of tag names",
+                    },
+                },
+                "required": ["task_id", "project_id"],
+            },
+        ),
+        Tool(
+            name="ticktick_complete_task",
+            description="Mark a TickTick task as completed.",
+            inputSchema={
+                "type": "object",
+                "properties": {
+                    "task_id": {
+                        "type": "string",
+                        "description": "The task ID to complete",
+                    },
+                    "project_id": {
+                        "type": "string",
+                        "description": "The project ID the task belongs to",
+                    },
+                },
+                "required": ["task_id", "project_id"],
+            },
+        ),
+        Tool(
+            name="ticktick_delete_task",
+            description="Delete a TickTick task. This is irreversible.",
+            inputSchema={
+                "type": "object",
+                "properties": {
+                    "task_id": {
+                        "type": "string",
+                        "description": "The task ID to delete",
+                    },
+                    "project_id": {
+                        "type": "string",
+                        "description": "The project ID the task belongs to",
+                    },
+                },
+                "required": ["task_id", "project_id"],
+            },
+        ),
+    ]
+
+
+# ---------------------------------------------------------------------------
+# Tool dispatch
+# ---------------------------------------------------------------------------
+
+
+@app.call_tool()
+async def call_tool(name: str, arguments: Any) -> list[TextContent]:
+    """Route tool calls to the appropriate handler."""
+    try:
+        if name == "ticktick_list_projects":
+            return await _handle_list_projects()
+        elif name == "ticktick_get_project":
+            return await _handle_get_project(arguments)
+        elif name == "ticktick_create_project":
+            return await _handle_create_project(arguments)
+        elif name == "ticktick_update_project":
+            return await _handle_update_project(arguments)
+        elif name == "ticktick_delete_project":
+            return await _handle_delete_project(arguments)
+        elif name == "ticktick_create_task":
+            return await _handle_create_task(arguments)
+        elif name == "ticktick_update_task":
+            return await _handle_update_task(arguments)
+        elif name == "ticktick_complete_task":
+            return await _handle_complete_task(arguments)
+        elif name == "ticktick_delete_task":
+            return await _handle_delete_task(arguments)
+        else:
+            return _error_text(f"[ERROR] Unknown tool: {name}")
+    except FileNotFoundError as exc:
+        return _error_text(str(exc))
+    except RuntimeError as exc:
+        return _error_text(str(exc))
+    except Exception as exc:
+        return _error_text(f"[ERROR] Unexpected failure in {name}: {exc}")
+
+
+# ---------------------------------------------------------------------------
+# Handler implementations
+# ---------------------------------------------------------------------------
+
+
+async def _handle_list_projects() -> list[TextContent]:
+    resp = await _ticktick_request("GET", "/project")
+    if resp.status_code != 200:
+        return _error_text(
+            f"[ERROR] Failed to list projects ({resp.status_code}): {resp.text}"
+        )
+    projects = resp.json()
+    return [TextContent(type="text", text=f"[OK] {len(projects)} projects found\n\n{_format_response(projects)}")]
+
+
+async def _handle_get_project(args: dict) -> list[TextContent]:
+    project_id = args["project_id"]
+    resp = await _ticktick_request("GET", f"/project/{project_id}/data")
+    if resp.status_code != 200:
+        return _error_text(
+            f"[ERROR] Failed to get project {project_id} ({resp.status_code}): {resp.text}"
+        )
+    data = resp.json()
+    task_count = len(data.get("tasks", []))
+    return [TextContent(type="text", text=f"[OK] Project retrieved ({task_count} tasks)\n\n{_format_response(data)}")]
+
+
+async def _handle_create_project(args: dict) -> list[TextContent]:
+    body: dict[str, Any] = {"name": args["name"]}
+    for key in ("color", "viewMode", "kind"):
+        if key in args:
+            body[key] = args[key]
+
+    resp = await _ticktick_request("POST", "/project", json_body=body)
+    if resp.status_code not in (200, 201):
+        return _error_text(
+            f"[ERROR] Failed to create project ({resp.status_code}): {resp.text}"
+        )
+    project = resp.json()
+    return [TextContent(type="text", text=f"[OK] Project created\n\n{_format_response(project)}")]
+
+
+async def _handle_update_project(args: dict) -> list[TextContent]:
+    project_id = args["project_id"]
+    body: dict[str, Any] = {}
+    for key in ("name", "color", "viewMode"):
+        if key in args:
+            body[key] = args[key]
+
+    if not body:
+        return _error_text("[WARNING] No update fields provided. Supply at least one of: name, color, viewMode.")
+
+    # TickTick uses POST for project updates in some API versions; fall back to PUT.
+    resp = await _ticktick_request("POST", f"/project/{project_id}", json_body=body)
+    if resp.status_code in (404, 405):
+        resp = await _ticktick_request("PUT", f"/project/{project_id}", json_body=body)
+
+    if resp.status_code not in (200, 201):
+        return _error_text(
+            f"[ERROR] Failed to update project {project_id} ({resp.status_code}): {resp.text}"
+        )
+    project = resp.json()
+    return [TextContent(type="text", text=f"[OK] Project updated\n\n{_format_response(project)}")]
+
+
+async def _handle_delete_project(args: dict) -> list[TextContent]:
+    project_id = args["project_id"]
+    resp = await _ticktick_request("DELETE", f"/project/{project_id}")
+    if resp.status_code not in (200, 204):
+        return _error_text(
+            f"[ERROR] Failed to delete project {project_id} ({resp.status_code}): {resp.text}"
+        )
+    return [TextContent(type="text", text=f"[OK] Project {project_id} deleted successfully.")]
+
+
+async def _handle_create_task(args: dict) -> list[TextContent]:
+    body: dict[str, Any] = {
+        "title": args["title"],
+        "projectId": args["project_id"],
+    }
+    if "content" in args:
+        body["content"] = args["content"]
+    if "priority" in args:
+        body["priority"] = args["priority"]
+    if "due_date" in args:
+        body["dueDate"] = args["due_date"]
+    if "tags" in args:
+        body["tags"] = args["tags"]
+
+    resp = await _ticktick_request("POST", "/task", json_body=body)
+    if resp.status_code not in (200, 201):
+        return _error_text(
+            f"[ERROR] Failed to create task ({resp.status_code}): {resp.text}"
+        )
+    task = resp.json()
+    return [TextContent(type="text", text=f"[OK] Task created\n\n{_format_response(task)}")]
+
+
+async def _handle_update_task(args: dict) -> list[TextContent]:
+    task_id = args["task_id"]
+    project_id = args["project_id"]
+
+    body: dict[str, Any] = {
+        "taskId": task_id,
+        "projectId": project_id,
+    }
+    if "title" in args:
+        body["title"] = args["title"]
+    if "content" in args:
+        body["content"] = args["content"]
+    if "priority" in args:
+        body["priority"] = args["priority"]
+    if "due_date" in args:
+        body["dueDate"] = args["due_date"]
+    if "tags" in args:
+        body["tags"] = args["tags"]
+
+    resp = await _ticktick_request("POST", f"/task/{task_id}", json_body=body)
+    if resp.status_code not in (200, 201):
+        return _error_text(
+            f"[ERROR] Failed to update task {task_id} ({resp.status_code}): {resp.text}"
+        )
+    task = resp.json()
+    return [TextContent(type="text", text=f"[OK] Task updated\n\n{_format_response(task)}")]
+
+
+async def _handle_complete_task(args: dict) -> list[TextContent]:
+    task_id = args["task_id"]
+    project_id = args["project_id"]
+    resp = await _ticktick_request(
+        "POST", f"/project/{project_id}/task/{task_id}/complete"
+    )
+    if resp.status_code not in (200, 204):
+        return _error_text(
+            f"[ERROR] Failed to complete task {task_id} ({resp.status_code}): {resp.text}"
+        )
+    return [TextContent(type="text", text=f"[OK] Task {task_id} marked as completed.")]
+
+
+async def _handle_delete_task(args: dict) -> list[TextContent]:
+    task_id = args["task_id"]
+    project_id = args["project_id"]
+    resp = await _ticktick_request(
+        "DELETE", f"/project/{project_id}/task/{task_id}"
+    )
+    if resp.status_code not in (200, 204):
+        return _error_text(
+            f"[ERROR] Failed to delete task {task_id} ({resp.status_code}): {resp.text}"
+        )
+    return [TextContent(type="text", text=f"[OK] Task {task_id} deleted successfully.")]
+
+
+# ---------------------------------------------------------------------------
+# Entry point
+# ---------------------------------------------------------------------------
+
+
+async def main() -> None:
+    """Run the TickTick MCP server over stdio transport."""
+    try:
+        from mcp.server.stdio import stdio_server
+
+        async with stdio_server() as (read_stream, write_stream):
+            await app.run(
+                read_stream,
+                write_stream,
+                app.create_initialization_options(),
+            )
+    except Exception as exc:
+        print(f"[ERROR] MCP server failed: {exc}", file=sys.stderr)
+        sys.exit(1)
+
+
+if __name__ == "__main__":
+    asyncio.run(main())
diff --git a/migrations/add_dev_projects_table.sql b/migrations/add_dev_projects_table.sql
new file mode 100644
index 0000000..831351a
--- /dev/null
+++ b/migrations/add_dev_projects_table.sql
@@ -0,0 +1,22 @@
+-- Migration: Add dev_projects table for tracking development projects
+-- Syncs with TickTick "Dev Projects" list (id: 69cbd7138f0826bd72746074)
+-- Date: 2026-03-31
+
+CREATE TABLE IF NOT EXISTS dev_projects (
+    id CHAR(36) PRIMARY KEY DEFAULT (UUID()),
+    name VARCHAR(200) NOT NULL,
+    description TEXT,
+    status ENUM('planning', 'active', 'paused', 'completed', 'archived') NOT NULL DEFAULT 'planning',
+    ticktick_task_id VARCHAR(100) DEFAULT NULL,
+    ticktick_project_id VARCHAR(100) DEFAULT '69cbd7138f0826bd72746074',
+    started_at DATETIME DEFAULT NULL,
+    completed_at DATETIME DEFAULT NULL,
+    last_worked_on DATETIME DEFAULT NULL,
+    total_sessions INT DEFAULT 0,
+    tags JSON DEFAULT NULL,
+    notes TEXT,
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
+);
+
+CREATE INDEX idx_dev_projects_status ON dev_projects(status);
diff --git a/session-logs/2026-03-31-session.md b/session-logs/2026-03-31-session.md
new file mode 100644
index 0000000..e82c4a9
--- /dev/null
+++ b/session-logs/2026-03-31-session.md
@@ -0,0 +1,131 @@
+# Session Log: 2026-03-31 - TickTick Integration & Dev Project Tracking
+
+## Session Summary
+
+Built a complete TickTick integration for ClaudeTools, including OAuth authentication, MCP server with 9 tools, FastAPI service+router, and a dev project tracking system that syncs between the ClaudeTools database and TickTick.
+
+### Key Decisions
+- **Hybrid approach (Option 3):** TickTick for mobile/cross-device visibility of active dev projects, ClaudeTools DB for granular tracking (sessions, notes, timestamps)
+- **MCP server + API service:** Both access paths -- MCP tools for Claude Code direct use, REST API for external access
+- **SOPS vault for credentials:** Consistent with project standards, no env vars
+- **JWT auth on all router endpoints:** Matches existing security pattern
+
+### Problems Encountered & Resolutions
+1. **"Guru" not appearing in API results:** It's a TickTick folder, not a list. The API only returns lists. "Tasks" and "Call Back List" are the actual lists inside the Guru folder.
+2. **Bash not found from PowerShell:** The auth script uses `subprocess.run(["bash", ...])` for vault access. Must run from bash/Claude Code terminal, not PowerShell directly.
+3. **DB server unreachable:** 172.16.3.30 not reachable from ACG-5070 without Tailscale. Installed Tailscale via winget, connected, then ran migration.
+4. **mcp package not installed:** Installed `mcp` and `httpx` via pip for Python 3.14.
+5. **Code review found 4 issues:** All fixed before proceeding -- gitignore, token permissions, JWT auth, SOPS vault credentials.
+
+---
+
+## Credentials
+
+### TickTick API (OAuth 2.0)
+- **Developer Portal:** https://developer.ticktick.com/
+- **App Name:** ClaudeTools
+- **Client ID:** 1J86gMsTJ0JH63gtf0
+- **Client Secret:** pI4U78vtLQrZwcW5MmdNFdxA0eeoy7GJ
+- **OAuth Redirect URL:** http://localhost:9876/callback
+- **Scopes:** tasks:read tasks:write
+- **SOPS Vault:** `services/ticktick.sops.yaml` (client_id, client_secret, oauth_redirect_url)
+- **Token File:** `mcp-servers/ticktick/.tokens.json` (gitignored, auto-refreshes)
+
+### TickTick API Endpoints
+- **Base URL:** https://api.ticktick.com/open/v1
+- **Auth URL:** https://ticktick.com/oauth/authorize
+- **Token URL:** https://ticktick.com/oauth/token
+- **Token endpoint requires:** Content-Type: application/x-www-form-urlencoded (NOT JSON)
+
+### Database
+- **Host:** 172.16.3.30:3306
+- **DB:** claudetools
+- **User:** claudetools
+- **Password:** CT_e8fcd5a3952030a79ed6debae6c954ed
+
+---
+
+## Infrastructure & Servers
+
+### Tailscale
+- Installed on ACG-5070 via `winget install Tailscale.Tailscale` (v1.96.3)
+- Required to reach 172.16.3.30 from home network
+- Tailscale must be connected before DB/API access works
+
+### TickTick IDs
+- **Dev Projects list ID:** `69cbd7138f0826bd72746074`
+- **TickTick Integration task ID:** `69cbe8ca8f0898cc050064e5`
+- **DB dev_projects row UUID:** `65783890-2d12-11f1-ae01-52540020ee14`
+
+### User's TickTick Projects (16 total)
+- Call Back List, COSTCO, Private, Capacitance, Website Department, Household Tasks & Projects, PacketDial, Tasks, Grocery, Kitchen Decon, Camper Packing, MOVE 2024, Photography Challenge, Business Planning, Libations shopping, Da Move
+- "Guru" is a folder containing "Tasks" (21 items) and "Call Back List"
+- "HomeStuff" is another folder (15 items)
+
+---
+
+## Files Created
+
+### MCP Server
+- `mcp-servers/ticktick/ticktick_auth.py` - One-time OAuth browser auth flow (localhost:9876 callback, CSRF protection, vault credential retrieval)
+- `mcp-servers/ticktick/ticktick_mcp.py` - MCP server with 9 tools: ticktick_list_projects, ticktick_get_project, ticktick_create_project, ticktick_update_project, ticktick_delete_project, ticktick_create_task, ticktick_update_task, ticktick_complete_task, ticktick_delete_task
+
+### API Integration
+- `api/services/ticktick_service.py` - Async service class with SOPS vault credentials, auto token refresh on 401, httpx client
+- `api/routers/ticktick.py` - REST endpoints at `/api/ticktick/`, JWT-protected, 9 endpoints matching MCP tools
+
+### Database
+- `migrations/add_dev_projects_table.sql` - Migration SQL for dev_projects table (14 columns, status index)
+
+### Configuration
+- `.mcp.json` - MCP server registration (ticktick server using python)
+- `vault/services/ticktick.sops.yaml` - SOPS-encrypted TickTick credentials
+
+## Files Modified
+
+- `api/main.py` - Added ticktick router import and registration at `/api/ticktick/`
+- `.gitignore` - Added `**/.tokens.json` to prevent token leakage
+- `.claude/memory/MEMORY.md` - Added TickTick integration reference
+- `.claude/memory/reference_ticktick_integration.md` - New memory file with full integration details
+
+## Database Changes
+
+- **New table:** `dev_projects` (14 columns) with index on status
+- **First row inserted:** "TickTick Integration" project, status=active, linked to TickTick task
+
+## Packages Installed
+
+- `mcp` (v1.26.0) - MCP protocol library for Python
+- `httpx` (v0.28.1) - Async HTTP client
+- `pydantic` (v2.12.5) - Data validation (mcp dependency)
+- `Tailscale` (v1.96.3) - VPN/mesh networking via winget
+- Plus ~25 transitive dependencies
+
+---
+
+## Pending/Incomplete Tasks
+
+1. **Dev projects API service + router** - Need `api/services/dev_project_service.py` and `api/routers/dev_projects.py` for CRUD on dev_projects table
+2. **Bidirectional sync logic** - Auto-update TickTick when DB status changes and vice versa
+3. **MCP server testing** - Need to restart Claude Code session to load the TickTick MCP server and test tools
+4. **TickTick folder placement** - API can't place "Dev Projects" list inside the "Guru" folder (no folder API). It appears at top level.
+5. **Existing project backfill** - Could add existing dev projects (like the TickTick integration itself) to track history
+
+---
+
+## Reference
+
+### TickTick API Gotchas
+- No webhooks (must poll for changes)
+- No search endpoint (filter client-side)
+- No folder management API
+- Priority values non-sequential: 0=none, 1=low, 3=medium, 5=high
+- Task update may need POST or PUT (code tries POST first, falls back to PUT)
+- Deletions are permanent via API
+- Date format: ISO 8601 with timezone offset
+
+### Re-authentication
+If tokens expire completely: `python mcp-servers/ticktick/ticktick_auth.py` (run from bash, not PowerShell)
+
+### MCP Tools Available (after session restart)
+All prefixed with `ticktick_`: list_projects, get_project, create_project, update_project, delete_project, create_task, update_task, complete_task, delete_task