[Bug] Poe Provider Tool Failure (1.18.18)

Description

[1.18.18 regression] All built-in client tools fail: "Unknown Bedrock client tool" (provider = Poe)

Env: OpenCode 1.18.18, macOS. Model: poe/anthropic/claude-opus-4.8 (provider: Poe).
Fresh instance, freshly re-authed to Poe. No config changes on my side.

Symptom: EVERY built-in tool call — read, write, edit, bash, glob, grep, todowrite,
task, webfetch, etc. — returns verbatim:
Unknown Bedrock client tool
The ONLY tool that works is the server-side native bedrock_agentcore_web_search.

Regression window: worked on 1.18.17; broke on auto-update to 1.18.18.

Plugins

None

OpenCode version

1.18.18

Steps to reproduce

1. Connect Poe.com provider
2. Select Opus 4.8 (or any model)
3. Add prompt that requires tool calling
4. Model fails to access tools.

Screenshot and/or share link

No response

Operating System

MacOS

Terminal

Ghostty - via Herdr

Start by comparing the Poe provider and built-in tool-call handling between OpenCode 1.18.17 and 1.18.18, reproducing with a Poe Opus 4.8 model and a prompt that invokes a tool. Trace why requests return “Unknown Bedrock client tool”; done means the built-in tools work through Poe again while the native web search remains functional.