Kairos
- Software
- Middleware
- Library
Kairos is a temporal and numeric PDDL planner written in C++20, usable as a C++ library, a command-line tool, and a Python module.
Made by PlanSys2.
Source on GitHub: github.com/PlanSys2/kairos (opens in a new tab). Facts read at commit fdada1d (opens in a new tab).
Licenses
- Code
- Apache-2.0 (opens in a new tab)
Read by Robotheca from LICENSE (opens in a new tab) (Apache-2.0) at commit fdada1d (opens in a new tab), on 22 Oct 2026.
- Commercial use
- Yes
What it does
- Covers PDDL 2.1 level 3 with durative actions and numeric fluents, plus derived predicates and timed initial literals.
- Chooses between a fast engine for temporally simple problems and a complete one for required concurrency, based on task analysis.
- Returns the first valid plan quickly and keeps searching, passing each better plan to a callback.
- Validates PDDL domains and problems without planning, reporting errors with file, line and column.
- Has a plan validator independent of the planner and can read plans from other planners.
- Works with PlanSys2 through its POPF plugin, with a native plugin planned for later.
Written by Robotheca from the project's README (opens in a new tab) at commit fdada1d.
Getting started
- Difficulty
- Advanced
- Hardware it needs, as the project states it
- Built with CMake 3.22 or newer and GCC 11 or Clang 17 or newer.
- How to start
- The project's README (opens in a new tab)
Maintenance
- Status
- Active: a commit in the last 90 days
- Newest commit
- 21 Oct 2026 on main
- Latest release
- Kairos 1.0.6 (21 Oct 2026)
Checked on GitHub on 22 Oct 2026.
Links
Robots that can run it
No robot on Robotheca is linked to it yet. Links come from a robot's robot.yaml, from its dependency files read as text, or from Robotheca's editors.
Robotheca lists software as a reference: nothing is hosted or run here, and every fact links to where it was read.