Slack

Slack Calls API

The Calls API from Slack — 6 operation(s) for calls.

Documentation GitHub OpenAPI

Operations 4

Each operation below carries the questions people ask an LLM about it and the instructions they give an agent to run it. Generated by API Evangelist overlay

POST /calls.end End a call · Slack Post Calls End #

Ask an LLM

“How does my app mark a Slack call as ended?”

“Can I record how long a call lasted when ending it?”

Tell an agent

End call {id}.

End call {id} with a duration of {duration} seconds.

GET /calls.info Get details about a call · Slack Get Calls Info #

Ask an LLM

“What information is available about a registered call?”

“Can I look up a call's participants and join URL?”

Tell an agent

Get the details of call {id}.

Show information about call {id}.

POST /calls.participants.remove Register participants who left a call · Slack Post Calls Participants Remove #

Ask an LLM

“How do I tell Slack that someone left a call?”

“Can several participants be removed from a call at once?”

Tell an agent

Remove users {users} from call {id}.

Register that {users} left call {id}.

POST /calls.update Update a call's title or join links · Slack Post Calls Update #

Ask an LLM

“Can I change a call's title after it started?”

“Is it possible to update the desktop join link for a call?”

Tell an agent

Rename call {id} to {title}.

Set the join URL of call {id} to {join_url}.

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this

find_apisBrowse and filter every API in the catalog.
get_api_artifactsOne API's artifacts, grouped by type.
get_openapiThe primary OpenAPI for this API.
find_similar_apisAPIs that look like this one.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This API

curl "https://apis.io/api/v1/apis/slack:slack-calls-api"

All apis

curl "https://apis.io/api/v1/apis?limit=25"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

OpenAPI Specification

openapi: 3.2.0
info:
  version: '1.0'
  title: Slack Calls API
  description: Slacks Calls API lets apps represent thirdparty voice or video calls inside Slack by creating a call object with a join URL and metadata, so users see a rich call message with a Join button, status, and participant list in channels or DMs.
tags:
- name: Calls
paths:
  /calls.end:
    post:
      tags:
      - Calls
      description: Ends a Call.
      externalDocs:
        description: API method documentation
        url: https://api.slack.com/methods/calls.end
      operationId: calls_end
      parameters:
      - name: token
        in: header
        description: 'Authentication token. Requires scope: `calls:write`'
        required: true
        schema:
          type: string
      requestBody:
        content:
          application/x-www-form-urlencoded:
            schema:
              required:
              - id
              type: object
              properties:
                id:
                  type: string
                  description: '`id` returned when registering the call using the [`calls.add`](/methods/calls.add) method.'
                duration:
                  type: integer
                  description: Call duration in seconds
                  format: int32
          application/json:
            schema:
              required:
              - id
              type: object
              properties:
                id:
                  type: string
                  description: '`id` returned when registering the call using the [`calls.add`](/methods/calls.add) method.'
                duration:
                  type: integer
                  description: Call duration in seconds
                  format: int32
        required: true
      responses:
        '200':
          description: Typical success response
          content:
            application/json:
              schema:
                title: Default success template
                required:
                - ok
                type: object
                properties:
                  ok:
                    $ref: '#/components/schemas/defs_ok_true'
                additionalProperties: true
                description: This method either only returns a brief _OK_ response or a verbose schema is not available for this method.
              example:
                ok: true
        default:
          description: Typical error response
          content:
            application/json:
              schema:
                title: Default error template
                required:
                - ok
                type: object
                properties:
                  ok:
                    $ref: '#/components/schemas/defs_ok_false'
                additionalProperties: true
                description: This method either only returns a brief _not OK_ response or a verbose schema is not available for this method.
              example:
                error: invalid_auth
                ok: false
      security:
      - slackAuth:
        - calls:write
      summary: Slack Post Calls End
      x-api-evangelist-processing:
        GenerateOperationSummariesFromPath: true
        PascalCaseOperationSummaries: true
        PascalCaseOperationTags: true
        ChooseTags: true
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
  /calls.info:
    get:
      tags:
      - Calls
      description: Returns information about a Call.
      externalDocs:
        description: API method documentation
        url: https://api.slack.com/methods/calls.info
      operationId: calls_info
      parameters:
      - name: token
        in: header
        description: 'Authentication token. Requires scope: `calls:read`'
        required: true
        schema:
          type: string
      - name: id
        in: query
        description: '`id` of the Call returned by the [`calls.add`](/methods/calls.add) method.'
        required: true
        schema:
          type: string
      responses:
        '200':
          description: Typical success response
          content:
            application/json:
              schema:
                title: Default success template
                required:
                - ok
                type: object
                properties:
                  ok:
                    $ref: '#/components/schemas/defs_ok_true'
                additionalProperties: true
                description: This method either only returns a brief _OK_ response or a verbose schema is not available for this method.
              example:
                ok: true
        default:
          description: Typical error response
          content:
            application/json:
              schema:
                title: Default error template
                required:
                - ok
                type: object
                properties:
                  ok:
                    $ref: '#/components/schemas/defs_ok_false'
                additionalProperties: true
                description: This method either only returns a brief _not OK_ response or a verbose schema is not available for this method.
              example:
                error: invalid_auth
                ok: false
      security:
      - slackAuth:
        - calls:read
      summary: Slack Get Calls Info
      x-api-evangelist-processing:
        GenerateOperationSummariesFromPath: true
        PascalCaseOperationSummaries: true
        PascalCaseOperationTags: true
        ChooseTags: true
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
  /calls.participants.remove:
    post:
      tags:
      - Calls
      description: Registers participants removed from a Call.
      externalDocs:
        description: API method documentation
        url: https://api.slack.com/methods/calls.participants.remove
      operationId: calls_participants_remove
      parameters:
      - name: token
        in: header
        description: 'Authentication token. Requires scope: `calls:write`'
        required: true
        schema:
          type: string
      requestBody:
        content:
          application/x-www-form-urlencoded:
            schema:
              required:
              - id
              - users
              type: object
              properties:
                id:
                  type: string
                  description: '`id` returned by the [`calls.add`](/methods/calls.add) method.'
                users:
                  type: string
                  description: The list of users to remove as participants in the Call. [Read more on how to specify users here](/apis/calls#users).
          application/json:
            schema:
              required:
              - id
              - users
              type: object
              properties:
                id:
                  type: string
                  description: '`id` returned by the [`calls.add`](/methods/calls.add) method.'
                users:
                  type: string
                  description: The list of users to remove as participants in the Call. [Read more on how to specify users here](/apis/calls#users).
        required: true
      responses:
        '200':
          description: Typical success response
          content:
            application/json:
              schema:
                title: Default success template
                required:
                - ok
                type: object
                properties:
                  ok:
                    $ref: '#/components/schemas/defs_ok_true'
                additionalProperties: true
                description: This method either only returns a brief _OK_ response or a verbose schema is not available for this method.
              example:
                ok: true
        default:
          description: Typical error response
          content:
            application/json:
              schema:
                title: Default error template
                required:
                - ok
                type: object
                properties:
                  ok:
                    $ref: '#/components/schemas/defs_ok_false'
                additionalProperties: true
                description: This method either only returns a brief _not OK_ response or a verbose schema is not available for this method.
              example:
                error: invalid_auth
                ok: false
      security:
      - slackAuth:
        - calls:write
      summary: Slack Post Calls Participants Remove
      x-api-evangelist-processing:
        GenerateOperationSummariesFromPath: true
        PascalCaseOperationSummaries: true
        PascalCaseOperationTags: true
        ChooseTags: true
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
  /calls.update:
    post:
      tags:
      - Calls
      description: Updates information about a Call.
      externalDocs:
        description: API method documentation
        url: https://api.slack.com/methods/calls.update
      operationId: calls_update
      parameters:
      - name: token
        in: header
        description: 'Authentication token. Requires scope: `calls:write`'
        required: true
        schema:
          type: string
      requestBody:
        content:
          application/x-www-form-urlencoded:
            schema:
              required:
              - id
              type: object
              properties:
                id:
                  type: string
                  description: '`id` returned by the [`calls.add`](/methods/calls.add) method.'
                title:
                  type: string
                  description: The name of the Call.
                join_url:
                  type: string
                  description: The URL required for a client to join the Call.
                desktop_app_join_url:
                  type: string
                  description: When supplied, available Slack clients will attempt to directly launch the 3rd-party Call with this URL.
          application/json:
            schema:
              required:
              - id
              type: object
              properties:
                id:
                  type: string
                  description: '`id` returned by the [`calls.add`](/methods/calls.add) method.'
                title:
                  type: string
                  description: The name of the Call.
                join_url:
                  type: string
                  description: The URL required for a client to join the Call.
                desktop_app_join_url:
                  type: string
                  description: When supplied, available Slack clients will attempt to directly launch the 3rd-party Call with this URL.
        required: true
      responses:
        '200':
          description: Typical success response
          content:
            application/json:
              schema:
                title: Default success template
                required:
                - ok
                type: object
                properties:
                  ok:
                    $ref: '#/components/schemas/defs_ok_true'
                additionalProperties: true
                description: This method either only returns a brief _OK_ response or a verbose schema is not available for this method.
              example:
                ok: true
        default:
          description: Typical error response
          content:
            application/json:
              schema:
                title: Default error template
                required:
                - ok
                type: object
                properties:
                  ok:
                    $ref: '#/components/schemas/defs_ok_false'
                additionalProperties: true
                description: This method either only returns a brief _not OK_ response or a verbose schema is not available for this method.
              example:
                error: invalid_auth
                ok: false
      security:
      - slackAuth:
        - calls:write
      summary: Slack Post Calls Update
      x-api-evangelist-processing:
        GenerateOperationSummariesFromPath: true
        PascalCaseOperationSummaries: true
        PascalCaseOperationTags: true
        ChooseTags: true
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK

Slack Calls API

Operations 4

Documentation

Specifications

Schemas & Data

Other Resources

Work with this as data

MCP server

Tools for apis

Call it yourself

Get an API key

OpenAPI Specification