# TLA+ Specifications

This directory contains TLA+ formal specifications for the GithubWorkflowTool project.

## About TLA+

TLA+ is a formal specification language developed by Leslie Lamport for designing, modeling, documenting, and verifying concurrent systems and algorithms. It's particularly useful for:

- Modeling distributed systems and concurrent processes
- Verifying correctness properties
- Finding subtle bugs in system designs
- Documenting system behavior formally

## Purpose

The TLA+ specifications in this directory formally model key components of the GithubWorkflowTool, including:

- Workflow execution semantics
- Job dependency resolution
- Concurrent job execution
- State transitions in the workflow engine
- Cache and artifact management

## Tools

To work with TLA+ specifications, you'll need:

- **TLA+ Toolbox**: The IDE for TLA+ (https://lamport.azurewebsites.net/tla/toolbox.html)
- **TLC Model Checker**: For checking specifications (included with the Toolbox)
- **TLAPS**: The TLA+ Proof System (optional, for formal proofs)

## File Structure

TLA+ specification files typically have the `.tla` extension. Each specification may include:

- Module definitions
- Constants and variables
- Initial state predicates
- Next-state actions
- Invariants and temporal properties

## Resources

- [TLA+ Homepage](https://lamport.azurewebsites.net/tla/tla.html)
- [Learn TLA+](https://learntla.com/)
- [TLA+ Examples](https://github.com/tlaplus/Examples)
- [Specifying Systems Book](https://lamport.azurewebsites.net/tla/book.html)