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| @slack_toolset.tool(name="slack.chat.postMessage") | ||
| def post_message( | ||
| ctx: RunContext[Deps], params: SlackChatPostMessageParams | ||
| ) -> SlackResponse: | ||
| """ | ||
| Use this function to post a message in the specified channel | ||
| """ | ||
| return ctx.deps.client.chat_postMessage(channel=params.channel, text=params.text) |
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[P1] Return SlackResponse from tool prevents serialization
The new post_message tool returns the SlackResponse object directly. When this function is executed via FunctionToolset, the agent has to JSON‑serialize the tool’s output to send it back to the model. SlackResponse carries non‑serializable attributes (e.g., the underlying WebClient and requests.Response), so the agent will raise a TypeError instead of reporting the Slack call result. Consider returning a plain dict/BaseModel such as response.data so the tool output can be encoded.
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