gco-2nd - SKILL.md Agent Skill

name: gco-2nd description: "Get a second opinion from GitHub Copilot CLI on a plan or approach. Use when: (1) Planning phase of /x-as-pr or /x-wt-teams to validate the approach, (2) User says 'gco 2nd', 'copilot 2nd', or 'copilot opinion', (3) Wanting an alternative perspective before committing to a plan." allowed-tools: - Bash(bash ) - Bash(timeout ) - Bash(gtimeout ) - Bash(node )

GCO 2nd Opinion

Get a second opinion from GitHub Copilot CLI on a plan, approach, or codebase exploration.

Process

Step 0: Pre-flight Rate Limit Check

Before doing anything, check if Copilot is currently in degraded mode:

RATE_CHECK=$(node $HOME/.claude/scripts/gco-rate-limit.js check 2>&1)

If the output starts with degraded:, notify the user that Copilot is in low-cost mode (auto-downgraded model) but proceed with Copilot anyway — it is still usable. Do NOT skip.

Step 1: Build Context Prompt

Construct a prompt that includes:

The current plan or approach being considered
Key files or areas of the codebase involved
Specific questions or concerns

You are reviewing a development plan. Provide a second opinion.

## Context
<what the project is, what repo we're in>

## Current Plan
<the plan or approach being considered>

## Questions
1. Are there any risks, edge cases, or issues with this approach?
2. Is there a simpler or better alternative?
3. Are there any files or areas of the codebase that should be considered but aren't mentioned?
4. Any other suggestions or concerns?

Be concise and practical. Focus on actionable feedback. If the plan looks solid, say so briefly — don't invent problems.

Step 2: Run Copilot

LOGDIR=$(node $HOME/.claude/scripts/get-logdir.js)
mkdir -p "$LOGDIR"
DATETIME=$(date +%Y%m%d_%H%M%S)

bash $HOME/.claude/skills/gco/scripts/gco-run.sh \
  "<prompt>" \
  "$LOGDIR/${DATETIME}-gco-2nd.md" \
  "$LOGDIR/${DATETIME}-gco-2nd-stderr.log"

Timeout: 15 minutes.

Step 3: Collect Results

Read the output file
If empty or missing, check stderr log for errors (a 402 no-quota error means Copilot Premium is exhausted — treat it as a failure)
If Copilot timed out, failed, or produced no output, skip — the plan proceeds without the second opinion

Step 4: Return Feedback

Return the Copilot feedback to the caller. The caller decides whether to incorporate it into the plan.

No fallback needed. If Copilot fails, skip — the plan proceeds without the second opinion. This is advisory, not critical.

When Called by /x-as-pr or /x-wt-teams

After forming an initial plan, send it to Copilot for feedback
If useful feedback is returned, update the plan
Optionally re-run with the updated plan (up to 3 iterations total)
Finalize and proceed with implementation

Important Notes

Copilot reads workspace files for context — no need to paste file contents into the prompt
All file writing done by Claude Code, never by Copilot
This is advisory — never block the workflow if Copilot is unresponsive
NEVER use ~ in paths — use $HOME