Description

When sending a message in the TUI/CLI, OpenCode throws a schema validation error. This has been happening since v1.2.27 and persists in v1.3.0.

schema validation failure stack trace:
      at result6 (/$bunfs/root/src/index.js:107068:20)
      at createUserMessage (/$bunfs/root/src/index.js:252931:35)
schema validation issues: [
  {
    "origin": "string",
    "code": "invalid_format",
    "format": "starts_with",
    "prefix": "prt",
    "path": [
      "id"
    ],
    "message": "Invalid string: must start with \"prt\""
  }
]

Root Cause

The opencode-supermemory plugin generates part IDs with non-compliant prefixes (supermemory-nudge-* and supermemory-context-*) instead of the required prt prefix introduced in v1.2.25 (PR #16966).

The crash path:

1. createUserMessage() in prompt.ts processes parts and assigns valid prt_* IDs via the assign() function
2. Plugin.trigger("chat.message", ...) passes the parts array by reference to plugin hooks
3. The opencode-supermemory plugin pushes new parts with supermemory-nudge-* / supermemory-context-* IDs into the array (dist/index.js lines 14548, 14582)
4. Session.updatePart(part) validates via fn(MessageV2.Part, ...) which runs PartID.zod.parse() (z.string().startsWith("prt")) and throws

While this is a plugin-side bug, the core should protect itself against misbehaving plugins. After Plugin.trigger("chat.message") returns, there is no re-validation or re-assignment of part IDs for parts that plugins may have added or mutated.

Plugins

• opencode-supermemory (primary culprit)
• opencode-antigravity-auth@latest
• opencode-anthropic-oauth

Suggested Fix

Core (defense in depth): After Plugin.trigger("chat.message") in createUserMessage(), sanitize part IDs:

for (const part of parts) {
  if (!part.id || typeof part.id !== "string" || !part.id.startsWith("prt")) {
    (part as any).id = PartID.ascending()
  }
}

Plugin side: There are already multiple open PRs on supermemoryai/opencode-supermemory to fix this.

Immediate workaround: Patch ~/.cache/opencode/node_modules/opencode-supermemory/dist/index.js:

• Line 14548: change supermemory-nudge-${Date.now()} to prt_smnudge_${Date.now()}
• Line 14582: change supermemory-context-${Date.now()} to prt_smctx_${Date.now()}

OpenCode version

1.2.27 - 1.3.0

Steps to reproduce

1. Install opencode-supermemory plugin
2. Send any message in the TUI or CLI
3. The schema validation error is thrown

Screenshot and/or share link

No response

Operating System

Fedora 43

Terminal

Fish