Unexpected server error on startup (macOS 26)

[mindofcharles]

Description

(Installed via: brew install anomalyco/tap/opencode)

Problem

OpenCode starts, then immediately exits with:

Error: Unexpected server error. Check server logs for details.
    at <anonymous> (/$bunfs/root/chunk-17ddjttx.js:8:7615)
    at processTicksAndRejections (native:7:39)

Sometimes fragments mentioning MCP / Model Context Protocol servers appear before the crash.

What I already tried

• Uninstalled OpenCode
• Reinstalled OpenCode
• Removed Bun completely
• Removed every obvious file/folder containing "opencode"
• Reinstalled from Homebrew
• Started with --log-level DEBUG

The issue still occurs.

Logs

The log file exists but is empty:

~/.local/share/opencode/log/opencode.log

No useful error is written before the crash.

Additional observation

Running:

opencode --log-level DEBUG

produces normal terminal capability probing sequences (OSC/ANSI escape codes), indicating the TUI starts successfully before the crash.

This suggests:

• OpenCode binary launches successfully
• TUI initializes successfully
• Failure happens after startup, during application initialization or RPC requests

and no useful diagnostic information is written to the log file.

Plugins

No

OpenCode version

1.17.10

Steps to reproduce

I don't know (sorry)

Screenshot and/or share link

No response

Operating System

26.5.1

Terminal

macOS Terminal

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• opencode run exits with "unexpected server error" #33766: Same version (1.17.10), same error message ("Unexpected server error"), same symptom of empty log file after crash — reported the same day
• readFileStringSafe does not catch EISDIR - TUI crashes on every launch with Unexpected server error (exit 133 / SIGTRAP) #32205: Similar crash on macOS via Homebrew with the same error message and empty log file (different root cause identified: EISDIR in config path probe)

Please review those issues to see if they describe your situation before this is investigated further.

[sky5259021]

是的，确实有问题

[mindofcharles]

macOS: 26.5.2
OpenCode: 1.17.13

The same issue exists.

[mindofcharles]

macOS: 26.5.2
OpenCode: 1.18.5

The same issue exists.

[mindofcharles]

The cause of this issue has been identified and documented in #42739, so I am closing this issue.

Other possible causes of the same crash have been explained in #42739 (comment):

Additional Context: Scope of the Issue

Looking closely at the stack trace (Provider.list), this appears to be a general issue in how OpenCode discovers and initializes built-in providers rather than being strictly specific to Cloudflare.

If the initialization loop in Provider.list evaluates environment variables for every built-in provider on startup, any provider that throws a validation error on partial/missing credentials will take down the entire server process.