Slack OAuth fails because redirect URI is not registered

Craft Agents Version

0.13.3

Operating System

macOS (Apple Silicon)

OS Version

macOS 26 (Darwin 25.0.0), Apple Silicon

AI Provider

OpenAI / Codex

Model

GPT-5.6 Sol via OpenAI Codex

Description

Connecting a native Slack API source through the built-in “Sign in with Slack” OAuth flow fails before consent because Slack rejects Craft Agents’ redirect URI.Slack reports:redirect_uri did not match any configured URIs. Passed URI: https://thecraftagents.com/auth/callbackThis blocks account-based Slack authentication. The user does not want to create a separate Slack app or use a manually managed API token.

Steps to Reproduce

1. Create a source with type: "api", provider: "slack", api.baseUrl: "https://slack.com/api/", and api.authType: "oauth".2. Validate the source and trigger source_slack_oauth_trigger.3. Click the Slack sign-in action and select a Slack workspace/account.4. Observe Slack’s redirect URI error before authorization completes.

Expected Behavior

The built-in Slack OAuth flow should open Slack’s consent screen, allow the user to authorize their account/workspace, return through Craft Agents’ callback, and activate the Slack source without requiring the user to create their own Slack app or paste a token.

Actual Behavior

Slack rejects the request with:redirect_uri did not match any configured URIs. Passed URI: https://thecraftagents.com/auth/callbackThe source remains inactive with needs auth. Retrying produces the same result.

Screenshots / Screen Recordings

No response

Debug Logs

Additional Context

The installed release is the latest available version at the time of reporting (v0.13.3). The packaged OAuth relay uses https://thecraftagents.com/auth/callback for UI-started provider OAuth flows. No existing issue matching this exact Slack error was found.Related but not equivalent: #585 covered a Google OAuth redirect mismatch and is already closed. This report is specifically for the built-in Slack OAuth client/redirect registration.