When using it in opencode (by directly copying the .opencode directory), an error occurs when executing the /plan command.

[ShineChou1225]

The error is as follows. How can I resolve this issue?

│ Planner Task — Create implementation plan with risk assessment
Tool execution failed: [
{
"origin": "string",
"code": "invalid_format",
"format": "starts_with",
"prefix": "prt",
"path": [
"id"
],
"message": "Invalid string: must start with "prt""
}
]

[affaan-m]

If you are directly copying the raw .opencode directory, you are outside the most reliable install path.

Right now the safer supported routes are:

• use the npm package / packaged plugin path, or
• run OpenCode from the ECC repo itself

The direct-copy route can drift because the OpenCode plugin surface depends on the shipped package/build layout, not just the source tree existing in a folder. We recently tightened the packaging path and added a regression guard specifically so the built .opencode/dist payload is present in the package.

So my recommendation is:

1. stop using a manual partial copy of .opencode
2. switch to the package/install path from the current docs
3. if you still hit the same /plan error on current main, open a fresh bug with your OpenCode version, your opencode.json, and the exact install method you used

That old direct-copy failure mode is real, but it should not be the reference install workflow.