feat: replace Claude Code with OpenCode + Vercel AI Gateway

[sweetmantech]

Summary

• Replaces Claude Code with OpenCode as the AI coding assistant in Vercel Sandboxes
• Configures OpenCode to use the Vercel AI Gateway provider for model access
• New installOpenCode.ts installs opencode-ai CLI globally in the sandbox
• New writeOpenCodeConfig.ts writes opencode.json with Vercel AI Gateway provider and anthropic/claude-sonnet-4 model
• Updated runSandboxCommandTask.ts to call new install + config functions

Environment Variables

• New: VERCEL_AI_GATEWAY_API_KEY — must be set in Trigger.dev env vars (get from Vercel dashboard > AI Gateway > API keys)

Test plan

• Set VERCEL_AI_GATEWAY_API_KEY in Trigger.dev environment
• Create a sandbox with a command via POST /api/sandboxes
• Verify OpenCode is installed and opencode.json is written in the sandbox
• Verify the run-sandbox-command task completes successfully
• Verify command output is captured in stdout/stderr

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features
  • Integrated OpenCode CLI installation and configuration into sandbox initialization
  • OpenCode configured to connect with Vercel AI Gateway using Claude Sonnet 4 model
  • Added VERCEL_AI_GATEWAY_API_KEY environment variable requirement for sandbox operations

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📝 Walkthrough

Walkthrough

This pull request introduces two new modules (installOpenCode and writeOpenCodeConfig) that handle installing and configuring the OpenCode CLI within a Vercel sandbox environment, replacing the prior Claude Code integration in the runSandboxCommandTask workflow.

Changes

Cohort / File(s)	Summary
OpenCode Sandbox Installation src/sandboxes/installOpenCode.ts	New module that installs OpenCode CLI globally via privileged npm command with progress logging and error handling.
OpenCode Configuration src/sandboxes/writeOpenCodeConfig.ts	New module that writes OpenCode configuration to sandbox, including API Gateway setup and model mapping using the VERCEL_AI_GATEWAY_API_KEY environment variable.
Sandbox Task Integration src/tasks/runSandboxCommandTask.ts	Updated to import and invoke the new OpenCode modules, replacing Claude Code installation; adds VERCEL_AI_GATEWAY_API_KEY to required environment variables.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• feat: add runSandboxCommand task for background sandbox execution #17: Previously added Claude Code installation helpers and integrated them into runSandboxCommandTask, which this PR replaces with OpenCode equivalents.
• feat: ensure GitHub repo exists in sandbox before command execution #22: Modifies the same runSandboxCommandTask.ts file with GitHub repository and workflow steps, affecting the same sandbox setup orchestration.

Poem

🐰 OpenCode hops into the sandbox pen,
Config written again and again!
With API keys held ever so tight,
Our furry deployment flows just right! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: replacing Claude Code with OpenCode and Vercel AI Gateway integration, which aligns with all three modified files.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch sweetmantech/myc-4161-task-opencode-coding-assistant-add-opencode

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[coderabbitai]

Actionable comments posted: 1

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)

src/tasks/runSandboxCommandTask.ts (1)

36-40: ⚠️ Potential issue | 🟠 Major

VERCEL_AI_GATEWAY_API_KEY is not validated despite being documented as required.

The docstring at Lines 19-20 lists VERCEL_AI_GATEWAY_API_KEY as a required env var, but the guard at Lines 36-40 only checks the other three. This is the natural place to add the check (see Option B in the writeOpenCodeConfig.ts comment).

Proposed fix

     const token = process.env.VERCEL_TOKEN;
     const teamId = process.env.VERCEL_TEAM_ID;
     const projectId = process.env.VERCEL_PROJECT_ID;
+    const aiGatewayKey = process.env.VERCEL_AI_GATEWAY_API_KEY;

-    if (!token || !teamId || !projectId) {
+    if (!token || !teamId || !projectId || !aiGatewayKey) {
       throw new Error(
-        "Missing Vercel credentials. Set VERCEL_TOKEN, VERCEL_TEAM_ID, and VERCEL_PROJECT_ID."
+        "Missing Vercel credentials. Set VERCEL_TOKEN, VERCEL_TEAM_ID, VERCEL_PROJECT_ID, and VERCEL_AI_GATEWAY_API_KEY."
       );
     }

🤖 Fix all issues with AI agents

In `@src/sandboxes/writeOpenCodeConfig.ts`:
- Around line 10-24: The writeOpenCodeConfig function currently sets apiKey:
process.env.VERCEL_AI_GATEWAY_API_KEY which may be undefined and will be dropped
by JSON.stringify; add a fail-fast validation in writeOpenCodeConfig that checks
process.env.VERCEL_AI_GATEWAY_API_KEY (the VERCEL_AI_GATEWAY_API_KEY env var)
and throw a clear Error (or reject) with a descriptive message if missing, so
the missing credential is caught close to usage; alternatively, if you prefer
centralized checks, add the same validation in runSandboxCommandTask alongside
other env var validations.

🧹 Nitpick comments (1)

src/sandboxes/installOpenCode.ts (1)

15-15: Pin opencode-ai to a specific version range instead of @latest.

Using @latest in an automated pipeline means any breaking release will silently break all new sandbox runs. Since the package is currently at 0.6.4, pinning to a caret range (e.g., opencode-ai@^0.6) would allow security patches and minor updates without risking breaking changes.