Slack · OpenAPI Overlay 1.0.0

API Evangelist conversational phrasing for Slack OpenID Connect Authentication API

3 actions 3 updates phrasing extends openapi/slack-authentication-api-openapi.yml

Generated by API Evangelist Written by API Evangelist tooling for Slack's API. It is a proposal applied on top of the contract, not a document Slack publishes.

View Overlay File View on GitHub Overlay Specification

What the actions change

x-apievangelist-phrasing

Targets 3

$.info

$.paths['/openid.connect.token'].post

$.paths['/openid.connect.userInfo'].get

OpenAPI Overlay

# Generated by API Evangelist (build-phrasing.py). Our phrasing, not observed demand.
overlay: 1.0.0
info:
  title: API Evangelist conversational phrasing for Slack OpenID Connect Authentication API
  version: 1.0.0
extends: openapi/slack-authentication-api-openapi.yml
actions:
- target: $.info
  update:
    x-apievangelist-phrasing:
      method: generated
      generated: '2026-09-26'
      generator: build-phrasing.py
      label: Generated by API Evangelist
      operations: 2
- target: $.paths['/openid.connect.token'].post
  update:
    x-apievangelist-phrasing:
      intent: Exchange a code for OpenID Connect tokens
      effect: write
      questions:
      - How does Sign in with Slack turn an authorization code into an ID token?
      - Can I refresh an OpenID Connect token instead of doing the full flow?
      instructions:
      - text: Exchange code {code} for tokens with client {client_id} and secret {client_secret}.
        slots:
          code: requestBody.code
          client_id: requestBody.client_id
          client_secret: requestBody.client_secret
      - text: Exchange code {code} for client {client_id}, secret {client_secret}, redirect {redirect_uri}.
        slots:
          code: requestBody.code
          client_id: requestBody.client_id
          client_secret: requestBody.client_secret
          redirect_uri: requestBody.redirect_uri
      - text: Refresh with {refresh_token} for client {client_id}, secret {client_secret}, code {code}.
        slots:
          refresh_token: requestBody.refresh_token
          client_id: requestBody.client_id
          client_secret: requestBody.client_secret
          code: requestBody.code
      method: generated
      generated: '2026-09-26'
- target: $.paths['/openid.connect.userInfo'].get
  update:
    x-apievangelist-phrasing:
      intent: Get the signed-in user's identity
      effect: read
      questions:
      - What identity details do I get about someone who used Sign in with Slack?
      - Can I look up who a Sign in with Slack token belongs to?
      instructions:
      - text: Get the user info for OpenID token {token}.
        slots:
          token: query.token
      - text: Show who signed in with Slack using this token.
      method: generated
      generated: '2026-09-26'

Work with this as data

Every overlay 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 openapi overlays

4 MCP tools reach this

find_overlaysBrowse and filter every overlay in the catalog.
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 overlay

curl "https://apis.io/api/v1/overlays/slack-authentication-api-phrasing-overlay"

All openapi overlays

curl "https://apis.io/api/v1/overlays?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.