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[Bug]: failed grammer in opencode in combination with docker model runner #465
Description
Describe the bug
I get the error failed grammer from docker model runner when I use the backlog.md mcp server. With other mcp server I don't get this error. I reported this issue also with docker model runner and opencode.
docker/model-runner#534 (comment)
anomalyco/opencode#6104 (comment)
To Reproduce
Steps to reproduce the behavior:
Use opencode with docker model runner as llm host.
~/.config/opencode/opencode.json
{
"$schema": "https://opencode.ai/config.json",
"provider": {
"dms": {
"npm": "@ai-sdk/openai-compatible",
"name": "Docker Model Runner",
"options": {
"baseURL": "http://localhost:13434/engines/v1"
},
"models": {
"ai/qwen3-coder": {
"name": "Qwen3 coder"
}
}
}
}
}~/.config/opencode/opencode.jsonc
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"backlog": {
"type": "local",
"command": [ "backlog",
"mcp",
"start"
],
"enabled": true
}
}
}when asking the question "hi", or any other question, I get the error "failed grammer".
Expected behavior
A clear response from opencode.
Environment
- OS: mac os
- Node version: 22
Activity
MrLesk commentedon Apr 25, 2026
Alex's Agent: Thanks for the report. This looks like an interoperability failure between Backlog.md's MCP schema/tools and opencode + Docker Model Runner, but the current issue does not include the exact MCP request/schema or model-runner error payload. Could you add the opencode debug logs around the rejected tool call, the Backlog.md version, and whether the same config works with a non-Docker-model provider?
MrLesk commentedon Jul 1, 2026
Alex's Agent: Closing this as stale / needs-repro. On April 25, 2026 we asked for the opencode debug logs around the rejected tool call, the Backlog.md version, and whether the same config works with a non-Docker-model provider. There has been no follow-up since then.
The linked Docker Model Runner and opencode threads add useful context, but they still do not provide the exact Backlog MCP schema/request or current Backlog version needed to reproduce a Backlog.md bug. Those upstream threads are also closed, and the available data points to Docker Model Runner / llama grammar parsing interop rather than a confirmed Backlog.md issue.
If this still reproduces, please reopen with the requested logs, the raw MCP tools/list schema or failing request, the Backlog.md version, and the result with a non-Docker model provider.