Murmur: An Open-Source Cron Daemon for Automating Claude Code Sessions

Murmur is an open-source cron daemon designed to automate Claude code sessions on a predetermined schedule. You no longer need to manually initiate sessions for routine tasks like checking competitor changelogs or triaging GitHub issues.

Key Details

The setup involves creating a HEARTBEAT.md file that uses YAML frontmatter for configuration, followed by a prompt that outlines the task:

---
name: competitor watch
cron: 0 9 * * MON
agent: claude-code
model: sonnet
timeout: 10m
---
fetch https://competitor.com/changelog.
compare against ~/tracking/competitor-last.md for new entries.
for each new feature, check our issue tracker and think about
whether it makes sense for our product given our roadmap.
only if it genuinely adds value: open an issue with reasoning.
update competitor-last.md. if nothing new, HEARTBEAT_OK.

Murmur reads this configuration file and runs the Claude sessions per the cron schedule. It's not meant to replace CI/CD, but rather it handles tasks where the decision-making is not strictly algorithmic, such as reading, analyzing, and deciding on a course of action.

For installation, you can use the following Homebrew command: brew install t0dorakis/murmur/murmur. Alternatively, set it up with a guided interview using NPX: npx skills add t0dorakis/murmur --skill heartbeat-cron.

Who It's For

Murmur is particularly useful for developers looking to automate routine tasks that require some level of cognitive processing beyond simple scripting.