docs: add AGENTS.md specification for developers

AGENTS.md

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+# TrytonMCP Agent Specification
+
+## Overview
+
+TrytonMCP is an MCP (Model Context Protocol) server that enables LLMs to interact with Tryton ERP functionality through RPC calls. It wraps the `sabatron-tryton_rpc_client` library and exposes Tryton models as callable tools.
+
+## Project Structure
+
+```
+TrytonMCP/
+├── src/tryton-mcp/
+│   ├── __init__.py
+│   └── server.py          # Main MCP server with tool definitions
+├── test_rpc.py            # Standalone RPC test script
+└── pyproject.toml         # Project dependencies
+```
+
+## Architecture
+
+### Dependencies
+- **fastmcp[tasks]>=3.1.0** - MCP server framework
+- **sabatron-tryton-rpc-client>=7.4.0** - Tryton RPC client
+
+### Core Components
+
+1. **Client Connection** (`server.py:45-47, 59-61, 73-75`)
+   - Creates a new `Client` instance for each tool call
+   - Credentials are hardcoded in `TRYTON_CREDENTIALS` dict
+
+2. **Tools** - Functions decorated with `@mcp.tool()`:
+   - `create_schedule` (line 32-54) - Creates appointments in Naliia module
+   - `find_service_centers` (line 57-69) - Searches service centers
+   - `find_products_and_services` (line 71-83) - Searches salable products
+
+3. **Context** (`server.py:20-24`) - Dataclass for managing client state (currently unused)
+
+## Adding New Tools
+
+To add a new Tryton model as an MCP tool:
+
+```python
+@mcp.tool()
+def your_tool_name(param1: int, param2: str) -> List[dict]:
+    client = Client(**TRYTON_CREDENTIALS)
+    client.connect()
+    
+    name = "model.your.model.method"
+    args = [params, ...]
+    response = client.call(name, args)
+    
+    return response
+```
+
+## Running the Server
+
+```bash
+# Activate virtual environment
+source .venv/bin/activate
+
+# Run MCP server (stdio mode)
+python -m tryton_mcp.server
+
+# Or use fastmcp CLI
+fastmcp run tryton_mcp.server
+```
+
+## Configuration
+
+Edit `TRYTON_CREDENTIALS` in `server.py:12-17` to change connection settings:
+
+```python
+TRYTON_CREDENTIALS = {
+    "hostname": 'dev.naliia.co',
+    "database": 'capacitacion',
+    "username": 'admin',
+    "password": 'admin' 
+}
+```
+
+## Testing RPC Calls
+
+Use `test_rpc.py` to test Tryton RPC calls independently:
+
+```bash
+python test_rpc.py
+```