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🤖 Extreme chatops bot for Slack, Discord, Mattermost, IRC 🔧 New contributors welcome 🏗


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A chat bot written in Clojure, at your service.


Slack GitHub Workflow Status Yetibot Outdated dependencies Yetibot on Docker Hub Codecov

You can think of Yetibot as a communal command line. It excels at:

  • teaching: how to run internal automation, language evaluation for JS, Scala, Clojure, and Haskell
  • productivity: automating things around Jenkins, JIRA, running SSH commands on various servers, and interacting with internal APIs via private Yetibot plugins
  • fun: Google image search, gif lookups, meme generation

Features that make Yetibot powerful and great, which is to say fun:

  • Unix-style pipes allow tremendous expressiveness in chaining together complex and flexible commands.
  • Sub-expressions let you embed the output of one command into an outer command. They can be nested as many levels deep as you can imagine (open a PR to add to EXAMPLES if you come up with something crazy!).
  • Aliases let you parameterize complex expressions and give them a name allowing your team to quickly build up idiomatic team-specific Yetibot usages (not just memes!).
  • Per-channel settings let you store arbitrary config at the channel level, which can be used by commands or aliases to change the behavior of commands depending on which channel you're in (e.g. the default JIRA project(s) for a channel).
  • Feature category toggle lets you disable or enable entire categories of commands per-channel; useful for disabling gifs in the work-only channel 😁.

Take a look at the usage examples to see some fun useful things it can do.

This project is supported by:

New contributors

Welcome new contributors!

  • Feel free to tackle any issue
  • Issues labeled good first issue are good for first time Yetibot contributors
  • Ask @devth for help on Slack, GitHub or anywhere else you can find him

Use it right now

Get an invite to the official Yetibot slack at There's Yetibot running on a Droplet generously provided by DigitalOcean that you can play with in Slack.

Getting started

To quickly try out Yetibot with minimal config:

Yetibot users

Already using Yetibot? Please add yourself to the list of Yetibot users!



Road map

Yetibot has been undergoing continuous improvement since its inception. These are the immediate priorities, in addition to any bug fixes. Feedback and contributions are very welcome!

  • Write docs on how to develop Yetibot - See the Dev Guide
  • Dockerize Yetibot. Done! Check out the instructions.
  • Integrate with StackStorm for automation on steriods. Done! Check out yetibot-stackstorm.
  • Create a Heroku deploy button to make it easy to get started
  • Make adapters plugable
  • Create more examples of plugins (e.g. Travis)
  • Run a demo Yetibot instance — you can now talk to a Yetibot on Freenode in the #yetibot channel or join Yetibot Slack!
  • Design & build yetibot.comDone!
  • Flatten the config and obtain it via environ to follow 12 Factor App practices #570


There are a few ways to run Yetibot:

  1. Follow the Docker instructions: the fastest way if you're already using Docker.

  2. yetibot-helm: the official Helm Chart for quickly running Yetibot on Kubernetes.

  3. Clone this repo: this gives you a standard Yetibot installation and provides a git-ignored place to store configuration. Run from the root dir with lein run.

  4. Make your own repo and depend on Yetibot: this gives you ultimate customizability, allowing you to depend on custom Yetibot plugins or define your own commands in-project, and gives you control over where you store your config (manual management, commit to private git repo, etc...)



See Configuration docs.


For more docs see the User Guide.

All commands are prefixed by !.


Output from one command can be piped to another, like Unix pipes.

!complete does IE support | xargs echo %s? No, it is sucky.

does ie support html5? No, it is sucky.
does ie support css3? No, it is sucky.
does ie support svg? No, it is sucky.
does ie support media queries? No, it is sucky.
does ie support ftps? No, it is sucky.
does ie support png? No, it is sucky.
does ie support canvas? No, it is sucky.
does ie support @font-face? No, it is sucky.
does ie support webgl? No, it is sucky.
does ie support ttf? No, it is sucky.


Backticks provide a lightweight syntax for sub-expressions, but they can't be nested.

!meme grumpy cat: `catfact` / False

Nested sub-expressions

For arbitrarily-nested sub-expressions, use $(expr) syntax, which disambiguates the open and closing of an expressions.

!meme philos: $(complete how does one $(users | random | letters | random) | random)


!echo `repeat 4 echo i don't always repeat myself but | unwords`…StackOverflowError | meme interesting:


You can build your own aliases at runtime. These are stored in the configured database, so upon restart they are restored.

!alias nogrid = repeat 3 echo `repeat 3 meme grumpy: no | join`

Pipes can be used, but the right-hand side must be quoted in order to treat it as a literal instead of being evaluated according to normal pipe behavior.

!alias i5 = "random | echo"

You can specify placeholder arguments on the right-hand side using $s to indicate all arguments, or $n (where n is a 1-based index of which arg).

!alias temp = "weather $s | head 2 | tail"
!temp 98104
=> 33.6 F (0.9 C), Overcast

Adapter config

IRC: Yetibot can listen on any number of channels. You configure channels in config.edn. You can also invite Yetibot to a channel at runtime using the IRC /invite command:

/invite yetibot #whoa

When you invite Yetibot to a new channel, config.edn is overwritten, so next time you restart Yetibot, it will re-join the same channels.

You can also use the !room command to tell yetibot to join or leave a channel.

!help room
room join <room> # join <room>
room leave <room> # leave <room>
room list # list rooms that yetibot is in
room set <key> <value> # configure a setting for the current room
room settings # show all chat settings for this room
room settings <key> # show the value for a single setting

Slack: bots can't join a channel on their own, they must be invited, so room configuration doesn't apply. Instead, /invite @yetibot to any channel that you're in, and /kick @yetibot if you want it to leave. NB: you might need special privileges in order to kick.

Campfire is no longer supported. If you use Campfire, open an issue and we can add it back in!

Other chat platforms: If your chat platform of choice is not supported, open an issue. Adding adapters is quite easy.


If a room has broadcast set to true, Tweets will be posted to that room. By default all rooms have it set to false. To enable:

!room set broadcast true


Yetibot self-documents itself using the docstrings of its various commands. Ask it for !help to get a list of help topics. !help all shows fully expanded command list for each topic.

!help | join ,
Use help <topic> for more details, !, <gen>that, alias, ascii, asciichart,
attack, buffer, catfact, chat, chuck, classnamer, clj, cls, complete, config,
count, curl, ebay, echo, eval, features, gh, giftv, grep, haiku, head, help,
history, horse, hs, http, image, info, jargon, jen, join, js, keys, list, log,
mail, meme, memethat, mustachefact, number, order, poke, poms, random, raw,
react, reload, repeat, rest, reverse, rhyme, scala, scalex, sed, set, sort, source,
split, ssh, status, tail, take, tee, twitter, update, uptime, urban, users,
vals, weather, wiki, wolfram, wordnik, words, xargs, xkcd, zen


Yetibot has a plugin-based architecture. Its core which all plugins depend on is yetibot.core.


Yetibot will load all commands and observers with namespaces on the classpath matching these regexes.

This lets you build any number of independent plugin projects and combine them via standard Leiningen dependencies.

How it works

Curious how the internals of Yetibot works? At a high level:

  1. commands are run through a parser built on InstaParse:
  2. an InstaParse transformer is configured to evaluate expressions through the interpreter, which handles things like nested sub-expressions and piped commands
  3. command namespaces are hooked into the interpreter's handle-cmd function using a cmd-hook macro and triggered via regex prefix matching

Getting help

If the docs or implementation code don't serve you well, please open a pull request and explain why so we can improve the docs. Also feel free to open an issue for feature requests!

Yetibot in the wild


Copyright © 2012-2019 Trevor Hartman. Distributed under the Eclipse Public License 1.0, the same as Clojure.

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