We improve the Slack platform every day by releasing new features, squashing bugs, and delivering fresh documentation. Here's an account of what's recently happened. This is our
We tweet about most of these updates from @slackapi but we also offer this wonderfully antiquated RSS feed. Slack, the service and product, has its own changelog too.
Recent important updates:
Consult scheduled changes for additional future-looking changes.
Here are the 166 changelog entries logged since November 2015.
APIs Beginning August 21, 2018 the
users:read.email scope is required to retrieve the
email field from user profiles while using user or workspace tokens. Consult our previous announcements on this topic from 2016 and 2017 for migration tips and some historical perspective.
Apps Adding contextual actions lets users send specific messages to your app at will. Here are some amazing things our partners do with actions. This blueprint demonstrates the ineffable synergy of using actions and dialogs together.
APIs We're compiling a humble library of JSON schema about the Events API into a kind of open specification called AsyncAPI.
APIs Newly-issued bot user token strings are a little longer than before. Building for the ages? Plan for token strings containing up to 255 characters.
Preview Apps participating in our developer preview using the Events API will need to subscribe to
message.app_home events for a focused feed of messages between your app and the people who interface with them through the app home. These messages aren't delivered to
message.im subscriptions now. Learn more.
APIs File threads, a replacement for file comments, is on the way! Learn about the changes ahead, some of them may break apps relying on file comments behavior and some apps may need to request additional scopes when working with files.
APIs Measure drop off and send helpful follow ups when users cancel dialogs with these opt-in cancellation notifications.
APIs Have a bot user token you don't need or want to use anymore? Now you can use
xoxb- tokens with
APIs We're tidying up the character limits on the
text field of posted messages. As of today, we'll truncate messages greater than 500,000 characters. We'll begin truncating messages greater than 40,000 characters in August 2018, after gradually lowering the maximum. Learn more.
Preview Your workspace token-based apps in developer preview must now request the
files:write scope to upload & manage files instead of
files:write:user. Existing access grants are backfilled. Know your read & write rights.
Preview Working with workspace token-based apps as part of our preview? Please start using
oauth.access instead of
oauth.token during installation. Read on to learn why and about new features.
APIs Some bots are users too. Now you can find a bot user's
APIs Enhance your dialogs with dynamic form elements "borrowed" from message menus. Learn more.
APIs Rediscover the conversations you're party to with
APIs We corrected and clarified the behavior of
users.profile.set to only allow admins of paid teams to update email address profile fields.
APIs We added a
type field to the requests dispatched to your Options Load URL, used in message menus and— well, it doesn't work anywhere else yet but we'll have a dialog about that one day...
APIs We are continuing to decrease the maximum number of results returned by
members arrays returned in
rtm.start, with the limit currently set to 500 results.
conversations.members provides paginated access instead. Read this October 2017 announcement for detail.
APIs Web API methods will be enhanced with tiered rate limiting beginning March 7, 2018, with most methods gaining greater limits than ever before. Learn more about this week's incremental rollout of rate limit tiers.
APIs Now you can follow up after users submit your dialogs. Use the new
response_url attached to any
dialog_submission to send messages after submission.
APIs Now users can respond to dialog textarea elements with up to 3,000 riveting, carefully-chosen characters.
APIs Events API rate limiting has matured, now allowing apps up to 30,000 event deliveries per workspace per hour. Having trouble keeping up? Event deliveries will only be disabled when apps drop below a 5% successful response rate. Learn more.
users.setActive method was recently rendered irrelevant by our efforts to modernize our message servers. Use
users.setPresence and/or connect via RTM to proclaim a user's presence instead. We'll remove this no-op method entirely on May 8, 2018.
APIs Catch up on recent changes to presence in the RTM and Web APIs and changes to come, including the deprecation of
presence parameter. Read on.
APIs Having trouble connecting to the RTM API lately? WebSocket URIs may contain querystring parameters & some libraries don't like that. Find out more.
Preview Workspace token apps in developer preview now must request the
chat:write scope to post messages. Existing access grants are backfilled. Read on, developer previewers!
APIs Active listening made easier: Subscribe to
app_mention events to exclusively receive messages mentioning your app or bot.
APIs Now shared channels can be made private and the implications are well worth considering, especially if assuming channel IDs beginning with C are public. Read on.
chat.getPermalink to easily exchange a message
ts for a permalink URL.
APIs Why couldn't bot users use
bots.info? We don't know but now they can too.
APIs Help people get back to work by deep linking to your Slack app or directly to a channel.
APIs When a workspace migrates to Enterprise Grid, existing users are given a second global user ID. Now you can bulk convert those with
migration.exchange and turn off your app's translation layer, living the dream of one user ID per user.
APIs Do what you like with this OpenAPI 2.0 specification of our Web API. Relatedly, most methods now contain more helpful response examples. More specs and coverage on the way. Read on about our API spec.
APIs Send JSON when posting to Web API write methods. Gone are the days of perfunctory errors when sending lovingly crafted JSON to
chat.postMessage and other methods. Read on.
APIs We broadened support for presenting your tokens as a "bearer token" in
Authorization HTTP headers with the Web API. Learn more.
APIs We removed the
unread_count_display fields from limited contexts of the new Conversations API. They weren't really supposed to be there. You won't find them spuriously lurking in the shadows again. We don't anticipate any issues but let us know if you find any.
members array found in many Web API methods like
rtm.start is now truncated. We continue to lower the maximum results returned. Please Use
conversations.members to manage memberships instead. Read on to learn more.
Docs Scheduled changes and feature retirements to the Slack platform are now easier to find in our forward-looking calendar of upcoming changes.
APIs The RTM API's
presence_change event requires
presence_sub subscriptions beginning November 15, 2017. Read on.
Apps Ask users for more structured form-based information with Dialogs.
APIs Now you can customize your app's experience by the locale and language preferred by users, channels, and other conversational constructs. Start practicing your Klingon. 🖖 Learn how.
Apps Shared Channels let Slack apps collaborate with users across different organizations.
Apps The Conversations API is a collection of more than 15 Web API methods normalizing the way apps deal with channels, direct messages, and more. Never rely on the first character of a channel ID again.
APIs The role of
@username is changing on the platform but we're making the transition as backwards-compatible as possible. Read on for important updates.
Docs We are clarifying two terms encountered throughout Slack, "team" (the people you talk to in Slack) and "workspace" (the place you do work). You'll find many team references updated to workspace across Slack and API documentation. With artifacts like the
team object, field, and parameters scattered through the platform, you'll often still encounter
team while reading and programming.
APIs No more sad panda 🐼 because we fixed it — Now the outgoing webhook response payload includes a
thread_ts attribute so you know if the message is triggered in a thread!
APIs Get an event when more members join your User Group or when — uh-oh, it loses members with
APIs Do you work with
presence_change events in the RTM API? Learn about new ways to subscribe and consolidate presence events here.
Tools We've compiled a collection of Best Practices around building fantastic Slack app user experiences. Your users will be stoked!
Tools We've turned a light on for you and your development team: App Blueprints are like recipes for building the internal integrations your team needs to succeed.
APIs We've corrected a long-standing bug where user or
@channel-type mentions in code blocks (
```) would trigger notifications. They won't now.
Apps We've made very minor improvements to our OAuth-based installation process. You may notice a shifted pixel here and there but no app-facing functionality has changed.
APIs Just like subscribing to your app's own newsletter: App Events tell the story of your app's lifecycle. Learn when your app is uninstalled with
app_uninstalled, or when user and bot tokens are revoked with
tokens_revoked. Pause and resume activity when teams migrate to Enterprise Grid with
APIs That old
channels.list API method has a new parameter:
exclude_members. Some teams are so big and some channels have so many members that listing them all in a single API response along with every other channel is just outright impractical. Cull unneeded data easily accessed with
channels.info by excluding
APIs We'd like you to stop using
rtm.start and start using
rtm.connect boots quickly and works well with the most gigantic teams and enterprises of the galaxy.
APIs It's spring cleaning time for email. We're winding down the grandfathering introduced for apps using
users:read created before January 4th, 2017. After
August 1st, 2017 your apps must request
users:read.email to gain that access. See this post for more detail. This retirement has been delayed with no date yet rescheduled.
APIs Observe the custom status of team members with
users.profile.get. Update a user's custom status with
users.profile.set. Learn how to sync status with calendars, cubicles, conference calls, and bathroom stalls.
Apps More ways to make messages interactive than before: introducing message menus. Define your options statically, dynamically, even personally — or use our handy conversation, channel, and user pickers. Don't forget your field guide.
APIs As with the humans operating them, user objects change over time. With the new
updated field, decisively learn last time a user object transformed. Look for it in methods including (but not limited to)
users.info. It's an integer value depicting seconds since the epoch.
Apps We're introducing new, multimedia ways for bots and apps to express themselves in the app directory. Follow our new guidelines to make a great impression with potential installers.
Apps Provide users posting links with all the context and interactivity they need, right in Slack. Introducing Slack app unfurling. Here's the announcement!
APIs Beginning March 9, 2017, events transmitted via the Events API will include
event_id is globally unique across all teams while the
event_time is when the event dispatched, in integer-based epoch time. Use these fields as you like, but there's nothing you need to do to prepare for this eventuality.
Apps We made it easier to create and manage your Slack apps. And if you're building internal integrations for your own team, there's a better way to install your app without worrying about the OAuths. Check it out.
APIs Looking for custom integrations? They're documented as legacy now. They still work like you're used to but we'd prefer you built your internal integrations as part of a Slack app instead.
APIs Minor field changes coming to
channels.history file messages and
skype user profile fields. Read all about it.
APIs You have the tools and the talent — now you have the opportunity: Learn how to develop for Slack Enterprise Grid. Here's the announcement for the suits.
APIs Now your app can read, write, and party with message threads. Rolling out to teams over the next few days, message threads are a perfect place to tuck your wonderful workflows. Here's our announcement.
APIs This new year's resolution is a minor slash command revolution: a backwards-compatible, familiar, and decisive means to resolve user IDs, channel IDs, and links from references in slash command invocations. Learn how to turn on this helpful, long-requested feature.
Apps Let's extend a warm welcome to new
app_id fields now appearing in our APIs.
app_id is now found in
bots.info. You'll also find
app_id in the
bot_changed events. What's an
app_id? It's the alphanumeric string found in the URL bar while managing your Slack apps.
APIs We've added a new OAuth permission scope called
users:read.email. Apps created after January 4th, 2017 will need to request this additional scope to gain access to team member
email fields when using
users.info. Existing Slack apps with
users:read are automatically grandfathered to include these fields. Here's even more detail on that.
Docs Now you'll find links to practical tutorials and thoughtful articles displayed beside relevant documentation found here on api.slack.com. Discover new articles or browse them by topic in our new Tutorials hub. Written something great? Tell us about it!
Tools Our developer relations team has renewed Slack's adoption of key open source tooling: Slack Developer Kits. Discover our Python & node.js SDKs in their new home on our community index.
APIs We will soon add an additional
response_metadata node to our JSON responses; we'll put warnings there first and other useful stuff later. More details are available.
APIs Newly issued OAuth token strings are longer than they were before, as we informed you about last month. Let us know if this vexes you.
APIs Now you can use the
users.profile:write OAuth permission scope to reset and upload profile images using
Apps We've dramatically improved the process of submitting a Slack App for inclusion in our Slack App Directory. You'll find a helpful, interactive checklist when first submitting your app. When you're ready to iterate further, you can simply create a secondary beta application. If a core piece of your app's functionality changes (like requesting new OAuth permission scopes), we'll happily review your app again. Read all about it on the platform blog.
Apps Ever needed to send a user to Slack directly from your app? Here's how to deep link and make native Slack clients part of your app's workflow: Open key teams, channels, and conversations. Or, defer to search results using the slack:// URI scheme.
APIs The character length of token strings is getting longer. Find out how long they'll get and how to future-proof yourself for changes in the future.
APIs You may encounter an occasional user ID beginning with the letter
W. We've released a new version of node-slack-sdk to correct a related bug. Read more about these changes.
APIs Introducing the Events API, a new way for Slack apps to receive event types previously available only to the real time messaging API. Subscribe to the events your app needs and have them delivered right to your server as they happen. Build a bot or event-driven app without worrying about websockets, and scale it like a web app. Read more about the Events API in our blog post, Subscribe to the Events API.
APIs Until now, it's been easy to accidentally send messages flush with hundreds of message attachments. We've begun limiting the number of message attachments per message to 100. For approaches like
chat.postMessage, incoming webhooks, and
response_urls you will receive a
too_many_attachments error. Unfortunately, we are unable to serve you an error when sending messages as part of a slash command or message buttons invocation response.
Apps If you're interested in listing your Slack App in our directory, you'll want to review our new Slack App Directory Agreement and consider our Security Review Process. Find these and other policies in our new Slack App developer policy hub.
APIs We've corrected a bug where incoming webhooks could post messages in "#general" even 1) if that channel restricts posts and 2) the user owning the webhook was not allowed to post there. This new behavior will only prevent recently created webhooks from posting to restricted "#general" channels, so if your old webhooks are relying on this quirk, they'll be fine for now.
APIs Now your applications can read and write defined team profile fields for individual team members. The
users.profile:write scope allows you to edit fields with
users.profile:read scope empowers you to discover available fields with
team.profile.get and retrieve user profiles with
Apps Slack apps can now add action-invoking interactive buttons to messages, allowing you to simplify workflows and encourage users to take decisive action from within Slack.
Tools For better readability, syntax highlighting has been added to code blocks throughout our documentation.
APIs We've corrected the behavior of
stars.list so that it only returns stars belonging to the owner of the presented token. The
user parameter may still be used if the provided user ID belongs to the user utilizing the token.
APIs Team administrators may now use tokens with the
admin scope to request information about the billable status of team members using the team.billableInfo API method.
APIs Now that
bot_id appears in the real-time messaging API and Web API, you need a better way to look up bot users. Use the new
bots.info method to query bot/application information by ID. It requires the
APIs Bot user tokens may now use
files.info to look up information about files they have access to by virtue of their channel memberships. Also, very helpful for adapting to upcoming file events changes.
Tools Manage your Slack apps joyously with our updated app edit pages.
APIs File events are changing in the real time messaging API beginning May 16th. Here are details on everything that will change, and the upcoming ability for
files.info to be used by bot users.
APIs As previously announced, we've added a
bot_id field to relevant API responses. Let us know if you run into any issues.
APIs We released a family of API methods to create and manage reminders. Meet reminders.list, reminders.info, reminders.add, reminders.delete, and of course reminders.complete.
Apps We fixed an unfortunate bug where a team member could inadvertently uninstall a whole Slack App from their team by removing a single incoming webhook associated with that instance of the app.
Tools Find out what we're building! Announcing our Platform Roadmap.
Tools Need ideas for building on Slack? Try the Ideaboard.
Tools Another way to keep up with the Slack Platform: Install the API News App to receive occasional, important notifications about the platform.
APIs Your bot users author their own messages, now they can edit them too. Bot user tokens may now use
chat.update, like humans do.
chat.postMessage will better intuit your intent when you don't explicitly specify the
as_user parameter. Let us know if we're guessing wrong!
APIs One day soon our Web API will warn you when something is only slightly wrong with your requests. Read all about API warnings.
Docs Be welcoming. Be kind. Look out for each other. This is the Code of Conduct for the Slack Developer community.
APIs Now bot users can use methods requiring the
dnd:read scope, like
dnd.teamInfo. Your bots'll be more polite than a protocol droid!
Docs Home in on hosting for your app or integration with this collection of hosting providers.
Tools Craft your fancy messages in real time with the new Message Builder!
Apps Users can now rename Bot Users they've installed as Slack Apps. More naming, more claiming. No more terrible twos.
Docs We finally updated the slackhq/slack-api-docs repository, reflecting recently introduced and quite ancient documentation updates and new features.
APIs As of January 4th, 2016, authorization headers are now required for most Web API requests involving file URLs. See this doc and blog post for more information.
url_download are no longer part of file objects
Docs Enjoy our evolving collection of Frequently Asked Questions (and answers!)
APIs Responses to Incoming Webhook requests now include
Apps Make sure you're ready before submitting your Slack App for review by following this Slack App Checklist.
Docs Incoming Webhooks documentation updated to better bait best practices and discourage fishy formatting behavior.
Docs The file object documentation now includes a list of possible file types.