Tool span reports incorrect latency after timeout

[csh-scl]

Issue

When webfetch times out, its span remains open until the turn ends.

• Configured timeout: 5 seconds
• Reported latency: 18.44 seconds
• Output: undefined

Cause

tool.execute.before starts the span, but tool.execute.after is not emitted on timeout.

OpenCode instead emits message.part.updated with:

• part.type = "tool"
• part.state.status = "error"
• part.state.time.end

The plugin does not handle this error event, so subsequent model processing is included in the tool latency.

Expected

On tool error, the plugin should:

• End the span at part.state.time.end
• Mark it as ERROR
• Record part.state.error

[bezbac]

This should be fixed in the newly released v0.2.0.

You might need to update your OpenCode config to explicitly reference this version if you’ve already used v0.1.0.

"plugin": [
  "@langfuse/opencode-observability-plugin@0.2.0",
]