The use case reported at #1259 (comment) has been supported for a long time but it was not by design.

client = WebClient(token="....")
client.chat_postMessage(text="fallback", blocks="{ JSON string here }")

The blocks and attachments arguments for chat.postMessage API etc. are supposed to be Sequence[Block | Attachment | dict] as of today. However, passing the whole blocks/attachments as a single str should be a relatively common use case. In future versions, the use case should be clearly covered in both type hints and its implementation.

Category (place an x in each of the [ ])

• slack_sdk.web.WebClient (sync/async) (Web API client)
• slack_sdk.webhook.WebhookClient (sync/async) (Incoming Webhook, response_url sender)
• slack_sdk.models (UI component builders)
• slack_sdk.oauth (OAuth Flow Utilities)
• slack_sdk.socket_mode (Socket Mode client)
• slack_sdk.audit_logs (Audit Logs API client)
• slack_sdk.scim (SCIM API client)
• slack_sdk.rtm (RTM client)
• slack_sdk.signature (Request Signature Verifier)

Requirements

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