Description
Many opencode-hosted models often emit XML/DSML-like chat content instead of valid tool-call payloads, causing tool execution to fail. E.g.:
<｜DSML｜ parameter name="edit">
<｜DSML｜ parameter name="edits" string="false">[...]</｜DSML｜ parameter>
<｜DSML｜ parameter name="path" string="true">/home/ubuntu/project/src/main.rs</｜DSML｜ parameter>
</｜DSML｜ invoke>
Expected: A valid structured tool call, or a clean rejection/fallback path.
Actual: The output is treated as plain text / malformed structured content, so the tool never runs correctly.
Impact:
- Tool calls fail or are ignored
- Automation breaks
- Models produce “fake” tool attempts that don’t execute
Observed with: DeepSeek v4.1 flash and similar models (happened before but I can't remember the exact models). For DeepSeek v4.1 flash, I started observing this behavior today, and model speed is also a lot slower than a few days ago. Probably means I am now routed to models deployed by opencode instead of official DeepSeek API used when first launched.
Plugins
NA
OpenCode version
NA
Steps to reproduce
Having long session with DeepSeek v4.1.
Screenshot and/or share link
NA
Operating System
Windows 11
Terminal
Windows Terminal
Description
Many opencode-hosted models often emit XML/DSML-like chat content instead of valid tool-call payloads, causing tool execution to fail. E.g.:
Expected: A valid structured tool call, or a clean rejection/fallback path.
Actual: The output is treated as plain text / malformed structured content, so the tool never runs correctly.
Impact:
Observed with: DeepSeek v4.1 flash and similar models (happened before but I can't remember the exact models). For DeepSeek v4.1 flash, I started observing this behavior today, and model speed is also a lot slower than a few days ago. Probably means I am now routed to models deployed by opencode instead of official DeepSeek API used when first launched.
Plugins
NA
OpenCode version
NA
Steps to reproduce
Having long session with DeepSeek v4.1.
Screenshot and/or share link
NA
Operating System
Windows 11
Terminal
Windows Terminal