feat(tools): rename start_here to tools_documentation with depth control (v2.7.4)

- Renamed start_here_workflow_guide to tools_documentation for clarity
- Added depth parameter to control documentation detail (essentials/full)
- Converted output from JSON to LLM-friendly plain text format
- Added per-tool documentation capability
- Created two-tier documentation system:
  - Essentials: brief info with key parameters and tips
  - Full: comprehensive docs with examples and best practices
- Documented 8 commonly used MCP tools
- Removed 380+ lines of unused getWorkflowGuide method
- Fixed duplicate tool definitions
- Updated all documentation references
- Added test script for tools documentation

BREAKING CHANGE: start_here_workflow_guide renamed to tools_documentation

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

README.md

@@ -2,7 +2,7 @@
 
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![GitHub stars](https://img.shields.io/github/stars/czlonkowski/n8n-mcp?style=social)](https://github.com/czlonkowski/n8n-mcp)
-[![Version](https://img.shields.io/badge/version-2.7.0-blue.svg)](https://github.com/czlonkowski/n8n-mcp)
+[![Version](https://img.shields.io/badge/version-2.7.4-blue.svg)](https://github.com/czlonkowski/n8n-mcp)
 [![Docker](https://img.shields.io/badge/docker-ghcr.io%2Fczlonkowski%2Fn8n--mcp-green.svg)](https://github.com/czlonkowski/n8n-mcp/pkgs/container/n8n-mcp)
 
 A Model Context Protocol (MCP) server that provides AI assistants with comprehensive access to n8n node documentation, properties, and operations. Deploy in minutes to give Claude and other AI assistants deep knowledge about n8n's 525+ workflow automation nodes.
@@ -198,7 +198,7 @@ You are an expert in n8n automation software using n8n-MCP tools. Your role is t
 
 ## Core Workflow Process
 
-1. **ALWAYS start with**: `start_here_workflow_guide()` to understand best practices and available tools.
+1. **ALWAYS start with**: `tools_documentation()` to understand best practices and available tools.
 
 2. **Discovery Phase** - Find the right nodes:
    - `search_nodes({query: 'keyword'})` - Search by functionality
@@ -343,7 +343,7 @@ When Claude, Anthropic's AI assistant, tested n8n-MCP, the results were transfor
 Once connected, Claude can use these powerful tools:
 
 ### Core Tools
-- **`start_here_workflow_guide`** - Essential guide and best practices (START HERE!)
+- **`tools_documentation`** - Get documentation for any MCP tool (START HERE!)
 - **`list_nodes`** - List all n8n nodes with filtering options
 - **`get_node_info`** - Get comprehensive information about a specific node
 - **`get_node_essentials`** - Get only essential properties with examples (10-20 properties instead of 200+)
@@ -502,6 +502,15 @@ Current database coverage (n8n v1.99.1):
 
 ## 🔄 Recent Updates
 
+### v2.7.4 - Self-Documenting MCP Tools
+- ✅ **RENAMED**: `start_here_workflow_guide` → `tools_documentation` for clarity
+- ✅ **NEW**: Depth parameter - Control documentation detail with "essentials" or "full"
+- ✅ **NEW**: Per-tool documentation - Get help for any specific MCP tool by name
+- ✅ **CONCISE**: Essential info by default, comprehensive docs on demand
+- ✅ **LLM-FRIENDLY**: Plain text format instead of JSON for better readability
+- ✅ **QUICK HELP**: Call without parameters for immediate quick reference
+- ✅ **8 TOOLS DOCUMENTED**: Complete documentation for most commonly used tools
+
 ### v2.7.0 - Diff-Based Workflow Editing with Transactional Updates
 - ✅ **NEW**: `n8n_update_partial_workflow` tool - Update workflows using diff operations
 - ✅ **RENAMED**: `n8n_update_workflow` → `n8n_update_full_workflow` for clarity