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Slack connector reference

Operations, inputs, troubleshooting, and questions for the Slack connection. Policy decides each change before the credential is resolved, and the action record carries the result.

Set up and verify the Slack connection

Choose one task and its account, and match the reads and actions on the overview page to it before granting provider permissions.
Prepare the connection settings from the overview page, connect the provider in Deixic, and choose which tools your agent can use.
Try a small task with a known result, and compare the returned identity and resource with what the account owner expects.
Configure approval for sensitive changes, review the destination and inputs, and check the result in the provider before expanding the workflow.

Information your agent can use

Resource	Record identity	Start with	Page coverage
Auth identity	`team_id` + `user_id`	Top level	None configured
Channels	`id`	Top level	Cursor
Private channels	`id`	Top level	Cursor
Private channel memberships	`name`	Private channels	Cursor
Users	`id`	Top level	Cursor

Record identity: Match on these fields before joining or deduplicating results; where none is specified, check the returned record first.
Start with: Resolve the parent identifier first.
None configured: No page continuation is configured for this resource. Check the response and any provider limits before treating it as a complete inventory.
Cursor: Cursor pagination. Continue from the returned cursor; an initial page is not a complete inventory.

Supported operations

Review the inputs before granting an action to an agent. Required inputs must be supplied, optional inputs narrow the request, and provider permissions apply in addition to Deixic policy.

Action: Can change provider state; review the target and inputs, then retain the result to avoid repeating completed work.
Read: Retrieves information; check the returned scope and identifiers before use.

Operation	Effect	Approval	Provider permissions	Inputs
Reply	Action	By policy	chat:write	3
Post Message	Action	By policy	chat:write	2
Get Permalink	Read	By policy	None named	2
Conversations Open	Action	By policy	im:write	1
Set Thread Status	Action	By policy	chat:write	3
Set Thread Title	Action	By policy	assistant:write	3
Set Suggested Prompts	Action	By policy	assistant:write	4
Post Blocks	Action	By policy	chat:write	4
Unfurl	Action	By policy	links:write	4
Start Stream	Action	By policy	chat:write	6
Append Stream	Action	By policy	chat:write	3
Stop Stream	Action	By policy	chat:write	3
Update Message	Action	By policy	chat:write	4
Delete Message	Action	Approval required	chat:write	2
Add Reaction	Action	By policy	reactions:write	4
Reactions Read	Read	By policy	reactions:read	2
Reactions List	Read	By policy	reactions:read	2
Remove Reaction	Action	By policy	reactions:write	4
Upload File	Action	By policy	files:write, files:read	3
Post Ephemeral	Action	By policy	chat:write	3
Open View	Action	By policy	None named	2
Push View	Action	By policy	None named	2
Update View	Action	By policy	None named	2
Publish Home	Action	By policy	None named	2
Channel Read	Read	By policy	channels:read, channels:history	3
Thread Read	Read	By policy	channels:read, channels:history	3
Messages Search	Read	By policy	search:read.public	4
Channels List	Read	By policy	channels:read, groups:read, im:read, mpim:read	2
Channel Members	Read	By policy	channels:read, groups:read	3
Users List	Read	By policy	users:read	2
User Read	Read	By policy	users:read	1
Files List	Read	By policy	files:read	3
File Read	Read	By policy	files:read	1
Workspace Read	Read	By policy	team:read	None named
Schedule Message	Action	By policy	chat:write	5
Delete Scheduled Message	Action	By policy	chat:write	3
Pending List	Read	By policy	None named	5
Channel Create	Action	By policy	channels:manage	2
Workspace Settings Read	Read	By policy	admin.teams:read	1
Apps Approved List	Read	By policy	admin.apps:read	3
Apps Requests List	Read	By policy	admin.apps:read	3
Workspace Settings Set Name	Action	By policy	admin.teams:write	3
Resources Thread Read	Read	By policy	channels:read, channels:history	3
Resources Channels List	Read	By policy	channels:read, groups:read, im:read, mpim:read	2

Inputs by operation

Reply Action

Inputs for Slack Reply
Input	Requirement	Accepted value
`channel`	Required	stringMinimum characters: 1
`text`	Required	stringMinimum characters: 1
`thread_ts`	Required	stringMinimum characters: 1

Post Message Action

Inputs for Slack Post Message
Input	Requirement	Accepted value
`channel`	Required	stringMinimum characters: 1
`text`	Required	stringMinimum characters: 1

Get Permalink Read

Inputs for Slack Get Permalink
Input	Requirement	Accepted value
`channel`	Required	stringMinimum characters: 1
`message_ts`	Required	stringMinimum characters: 1

Conversations Open Action

Inputs for Slack Conversations Open
Input	Requirement	Accepted value
`users`	Required	string

Set Thread Status Action

Inputs for Slack Set Thread Status
Input	Requirement	Accepted value
`channel_id`	Required	stringMinimum characters: 1
`status`	Required	string
`thread_ts`	Required	stringMinimum characters: 1

Set Thread Title Action

Inputs for Slack Set Thread Title
Input	Requirement	Accepted value
`channel_id`	Required	stringMinimum characters: 1
`thread_ts`	Required	stringMinimum characters: 1
`title`	Required	stringMinimum characters: 1Maximum characters: 255

Set Suggested Prompts Action

Inputs for Slack Set Suggested Prompts
Input	Requirement	Accepted value
`channel_id`	Required	stringMinimum characters: 1
`prompts`	Required	arrayMinimum items: 1Maximum items: 4
`thread_ts`	Optional	stringMinimum characters: 1
`title`	Optional	stringMinimum characters: 1Maximum characters: 255

Post Blocks Action

Inputs for Slack Post Blocks
Input	Requirement	Accepted value
`blocks`	Required	stringMinimum characters: 1
`channel`	Required	stringMinimum characters: 1
`text`	Required	stringMinimum characters: 1
`thread_ts`	Optional	stringMinimum characters: 1

Unfurl Action

Inputs for Slack Unfurl
Input	Requirement	Accepted value
`channel`	Required	stringMinimum characters: 1
`idempotency_key`	Optional	stringMinimum characters: 1
`ts`	Required	stringMinimum characters: 1
`unfurls`	Required	stringMinimum characters: 1Maximum characters: 16000

Start Stream Action

Inputs for Slack Start Stream
Input	Requirement	Accepted value
`channel`	Required	stringMinimum characters: 1
`markdown_text`	Optional	stringMinimum characters: 1Maximum characters: 12000
`recipient_team_id`	Optional	stringMinimum characters: 1
`recipient_user_id`	Optional	stringMinimum characters: 1
`task_display_mode`	Optional	string; one of: timeline, plan, dense
`thread_ts`	Required	stringMinimum characters: 1

Append Stream Action

Inputs for Slack Append Stream
Input	Requirement	Accepted value
`channel`	Required	stringMinimum characters: 1
`markdown_text`	Required	stringMinimum characters: 1Maximum characters: 12000
`ts`	Required	stringMinimum characters: 1

Stop Stream Action

Inputs for Slack Stop Stream
Input	Requirement	Accepted value
`channel`	Required	stringMinimum characters: 1
`markdown_text`	Optional	stringMinimum characters: 1Maximum characters: 12000
`ts`	Required	stringMinimum characters: 1

Update Message Action

Inputs for Slack Update Message
Input	Requirement	Accepted value
`blocks`	Optional	stringMinimum characters: 1
`channel`	Required	stringMinimum characters: 1
`text`	Required	stringMinimum characters: 1
`ts`	Required	stringMinimum characters: 1

Delete Message Action · approval required

Inputs for Slack Delete Message
Input	Requirement	Accepted value
`channel`	Required	stringMinimum characters: 1
`ts`	Required	stringMinimum characters: 1

Add Reaction Action

Inputs for Slack Add Reaction
Input	Requirement	Accepted value
`channel`	Required	stringMinimum characters: 1
`idempotency_key`	Optional	stringMinimum characters: 1
`name`	Required	stringMinimum characters: 1
`timestamp`	Required	stringMinimum characters: 1

Reactions Read Read

Inputs for Slack Reactions Read
Input	Requirement	Accepted value
`channel`	Required	stringMinimum characters: 1
`timestamp`	Required	stringMinimum characters: 1

Reactions List Read

Inputs for Slack Reactions List
Input	Requirement	Accepted value
`cursor`	Optional	stringMinimum characters: 1
`limit`	Optional	integerMinimum: 1Maximum: 200

Remove Reaction Action

Inputs for Slack Remove Reaction
Input	Requirement	Accepted value
`channel`	Required	stringMinimum characters: 1
`idempotency_key`	Optional	stringMinimum characters: 1
`name`	Required	stringMinimum characters: 1
`timestamp`	Required	stringMinimum characters: 1

Upload File Action

Inputs for Slack Upload File
Input	Requirement	Accepted value
`channel`	Required	stringMinimum characters: 1
`content`	Required	stringMinimum characters: 1
`filename`	Required	stringMinimum characters: 1

Post Ephemeral Action

Inputs for Slack Post Ephemeral
Input	Requirement	Accepted value
`channel`	Required	stringMinimum characters: 1
`text`	Required	stringMinimum characters: 1
`user`	Required	stringMinimum characters: 1

Open View Action

Inputs for Slack Open View
Input	Requirement	Accepted value
`trigger_id`	Required	stringMinimum characters: 1
`view`	Required	stringMinimum characters: 1

Push View Action

Inputs for Slack Push View
Input	Requirement	Accepted value
`trigger_id`	Required	stringMinimum characters: 1
`view`	Required	stringMinimum characters: 1

Update View Action

Inputs for Slack Update View
Input	Requirement	Accepted value
`view`	Required	stringMinimum characters: 1
`view_id`	Required	stringMinimum characters: 1

Publish Home Action

Inputs for Slack Publish Home
Input	Requirement	Accepted value
`user_id`	Required	stringMinimum characters: 1
`view`	Required	stringMinimum characters: 1

Channel Read Read

Inputs for Slack Channel Read
Input	Requirement	Accepted value
`channel_id`	Required	stringMinimum characters: 1
`limit`	Optional	integerMinimum: 1Maximum: 200
`oldest`	Optional	stringMinimum characters: 1

Thread Read Read

Inputs for Slack Thread Read
Input	Requirement	Accepted value
`channel_id`	Required	stringMinimum characters: 1
`limit`	Optional	integerMinimum: 1Maximum: 200
`thread_ts`	Required	stringMinimum characters: 1

Messages Search Read

Inputs for Slack Messages Search
Input	Requirement	Accepted value
`action_token`	Required	stringMinimum characters: 1Maximum characters: 4096
`cursor`	Optional	stringMinimum characters: 1Maximum characters: 2048
`limit`	Optional	integerMinimum: 1Maximum: 20
`query`	Required	stringMinimum characters: 1Maximum characters: 1024

Channels List Read

Inputs for Slack Channels List
Input	Requirement	Accepted value
`cursor`	Optional	stringMinimum characters: 1Maximum characters: 2048
`limit`	Optional	integerMinimum: 1Maximum: 200

Channel Members Read

Inputs for Slack Channel Members
Input	Requirement	Accepted value
`channel_id`	Required	stringMinimum characters: 1
`cursor`	Optional	stringMinimum characters: 1Maximum characters: 2048
`limit`	Optional	integerMinimum: 1Maximum: 200

Users List Read

Inputs for Slack Users List
Input	Requirement	Accepted value
`cursor`	Optional	stringMinimum characters: 1Maximum characters: 2048
`limit`	Optional	integerMinimum: 1Maximum: 200

User Read Read

Inputs for Slack User Read
Input	Requirement	Accepted value
`user_id`	Required	stringMinimum characters: 1

Files List Read

Inputs for Slack Files List
Input	Requirement	Accepted value
`channel_id`	Optional	stringMinimum characters: 1
`count`	Optional	integerMinimum: 1Maximum: 100
`page`	Optional	integerMinimum: 1Maximum: 100

File Read Read

Inputs for Slack File Read
Input	Requirement	Accepted value
`file_id`	Required	stringMinimum characters: 1

Schedule Message Action

Inputs for Slack Schedule Message
Input	Requirement	Accepted value
`channel`	Required	stringMinimum characters: 1
`idempotency_key`	Optional	stringMinimum characters: 1
`post_at`	Required	integerMinimum: 1000000000Maximum: 4102444800
`text`	Required	stringMinimum characters: 1Maximum characters: 4000
`thread_ts`	Optional	stringMinimum characters: 1

Delete Scheduled Message Action

Inputs for Slack Delete Scheduled Message
Input	Requirement	Accepted value
`channel`	Required	stringMinimum characters: 1
`idempotency_key`	Optional	stringMinimum characters: 1
`scheduled_message_id`	Required	stringMinimum characters: 1

Pending List Read

Inputs for Slack Pending List
Input	Requirement	Accepted value
`channel_id`	Optional	stringMinimum characters: 1
`cursor`	Optional	stringMinimum characters: 1Maximum characters: 2048
`latest`	Optional	stringMinimum characters: 1
`limit`	Optional	integerMinimum: 1Maximum: 200
`oldest`	Optional	stringMinimum characters: 1

Channel Create Action

Inputs for Slack Channel Create
Input	Requirement	Accepted value
`idempotency_key`	Optional	stringMinimum characters: 1
`name`	Required	string

Workspace Settings Read Read

Inputs for Slack Workspace Settings Read
Input	Requirement	Accepted value
`team_id`	Required	stringMinimum characters: 1

Apps Approved List Read

Inputs for Slack Apps Approved List
Input	Requirement	Accepted value
`cursor`	Optional	stringMinimum characters: 1Maximum characters: 2048
`limit`	Optional	integerMinimum: 1Maximum: 200
`team_id`	Required	stringMinimum characters: 1

Apps Requests List Read

Inputs for Slack Apps Requests List
Input	Requirement	Accepted value
`cursor`	Optional	stringMinimum characters: 1Maximum characters: 2048
`limit`	Optional	integerMinimum: 1Maximum: 200
`team_id`	Required	stringMinimum characters: 1

Workspace Settings Set Name Action

Inputs for Slack Workspace Settings Set Name
Input	Requirement	Accepted value
`idempotency_key`	Optional	stringMinimum characters: 1
`name`	Required	stringMinimum characters: 1Maximum characters: 100
`team_id`	Required	stringMinimum characters: 1

Resources Thread Read Read

Inputs for Slack Resources Thread Read
Input	Requirement	Accepted value
`channel_id`	Required	stringMinimum characters: 1Maximum characters: 128
`limit`	Optional	integerMinimum: 1Maximum: 200
`thread_ts`	Required	stringMinimum characters: 1Maximum characters: 64

Resources Channels List Read

Inputs for Slack Resources Channels List
Input	Requirement	Accepted value
`cursor`	Optional	stringMinimum characters: 1Maximum characters: 2048
`limit`	Optional	integerMinimum: 1Maximum: 200

When the Slack task does not produce the expected result

Connected, but the expected data is missing

Check the identity behind the oauth connection and its access to the specific resource; a successful connection does not establish access to every object.

Resolve parent resources first: Private channels. A matching display name is not enough for a child lookup.

The answer covers only part of the data

Check the resource’s page coverage, query filters, and result limit, and have the agent state the account and time window it inspected, so a partial response yields a scoped answer.

The agent keeps doing the same work

Inspect the action history for repeated targets and inputs, keep the successful result’s identifiers with the task, and refresh a lookup only when the information changed.

A change is waiting or failed

Check whether the call awaits approval, was rejected by policy, lacks an input, or failed at the provider, and after a timeout inspect the destination before repeating a write.

See how an action proceeds and how to review an approval.

Questions about the Slack connector

Can I use my existing agent with Slack?

Yes: connect your agent to Deixic through MCP, choose which connected tools it can use, and Deixic checks calls routed through its gateway; Dex is available if your team also wants an agent.

Can an agent change data in Slack?

This connector supports 7 actions, listed on its overview page. Configure a connection and choose the tools and provider permissions your task needs; an available action is not permission for every agent to run it, and Deixic policy and any required approval still apply to calls through the gateway.

What do I need to connect Slack?

Prepare Client ID, Client secret, Access token; the connection uses OAuth, and the connected identity’s provider permissions determine which resources it can access.

Does connecting Slack keep every answer up to date?

No: an earlier answer is still an earlier answer, so for a decision that depends on current state, have the agent refresh the source and retain the lookup time, and save stable instructions separately from facts that can change.

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