# Alloy Clean Agent Syntax Implementation

This document summarizes the changes made to the Alloy interpreter at `/Users/lydakis/Developer/alloy/alloy_interpreter.py` to support the clean agent syntax from the specification.

## Changes Made

### 1. Lexer Updates (Lines 11-25)

**Added new tokens:**
- `WITH` - for agent tool specification
- `TOOLS` - for agent tool specification

**Added new reserved keywords:**
- `'with': 'WITH'` 
- `'tools': 'TOOLS'`

### 2. Parser Grammar Updates

**New production rules added:**

```python
# Support for tuple assignment (result, error = ...)
def p_tuple_assignment(p):
    '''tuple_assignment : identifier_list EQ expression'''

def p_identifier_list(p):
    '''identifier_list : IDENTIFIER COMMA identifier_list
                       | IDENTIFIER'''

# Support for agent definitions
def p_agent_definition(p):
    '''agent_definition : IDENTIFIER EQ AGENT STRING
                        | IDENTIFIER EQ AGENT STRING WITH TOOLS tool_list'''

def p_tool_list(p):
    '''tool_list : IDENTIFIER COMMA tool_list
                 | IDENTIFIER'''
```

**Updated agent command parsing:**
- Now supports: `agent_ref IDENTIFIER expression` (Commands with data)
- Now supports: `agent_ref IDENTIFIER` (Commands without data)
- Maintains: `agent_ref STRING` (string commands)

**Updated agent reference parsing:**
- Now supports: `IDENTIFIER` (clean agent variable references)
- Maintains: `AGENT STRING` (old syntax)
- Maintains: `ALLOY` (built-in alloy agent)

### 3. Environment Class Updates (Lines 311-319)

**Enhanced agent storage:**
```python
def define_agent(self, name: str, model: str, tools: List[str] = None):
    self.agents[name] = {'model': model, 'tools': tools or []}

def get_agent(self, name: str) -> Dict[str, Any]:
    # Returns dict with 'model' and 'tools' keys
```

### 4. Interpreter Updates

**Added support for new AST node types:**
- `tuple_assign` - handles `result, error = ...` patterns
- `agent_def` - handles agent definition statements

**Enhanced agent command execution:**
- Distinguishes between Commands (capitalized) and tools (lowercase)
- Validates tool availability for agents
- Supports clean agent variable references

## Supported Syntax Examples

### Agent Definitions
```alloy
claude = agent "claude-3.5-sonnet"
researcher = agent "claude-3.5-sonnet" with tools web_search, read_files
```

### Agent Commands
```alloy
# Commands (capitalized)
analysis, error = claude Analyze user_data
summary, error = claude Summarize findings

# String commands (legacy)
result, error = claude "analyze this data"
```

### Tuple Assignment
```alloy
result, error = some_operation()
data, status, message = complex_operation()
```

### Agent References
```alloy
# Clean syntax - reference agent variables
result = claude Summarize data

# Built-in alloy agent
result = alloy "meta command"
```

## Backward Compatibility

All existing syntax continues to work:
- Tool definitions with `tool ... takes ... returns`
- Control flow with `when ... then ... otherwise`
- Agent blocks with `agent { must: ..., should: ... }`
- Original agent command syntax

## Error Handling

The implementation includes:
- Tool validation for agents (checks if agent has required tools)
- Graceful handling of tuple assignment mismatches
- Distinction between Commands and tools based on capitalization
- Support for error tuple patterns `(result, error)`

## Testing

To test the implementation:
1. Use `test_syntax_only.py` for syntax validation
2. Use `test_clean_syntax.py` for full interpreter testing
3. The existing `demo.py` should continue to work for backward compatibility

## Files Modified

- `/Users/lydakis/Developer/alloy/alloy_interpreter.py` - Main interpreter with all syntax updates