Vercel Plugin Eval

Plugin Eval

Launch real Claude Code sessions with the plugin installed, monitor debug logs in real-time, and verify every hook fires correctly with proper dedup.

DO NOT (Hard Rules)

• DO NOT use claude --print or -p — hooks don't fire, no files created
• DO NOT use --dangerously-skip-permissions
• DO NOT create projects in /tmp/ — always use ~/dev/vercel-plugin-testing/
• DO NOT manually wire hooks or create settings.local.json — use npx add-plugin
• DO NOT set CLAUDE_PLUGIN_ROOT manually
• DO NOT use bash -c in WezTerm — use /bin/zsh -ic
• DO NOT use full path to claude — use the x alias
• DO NOT write eval scripts — do everything as Bash tool calls in the conversation

Copy the exact commands below. Do not improvise.

Quick Start

Always append a timestamp to directory names so reruns don't overwrite old projects:

# 1. Create test dir & install plugin (with timestamp)
TS=$(date +%Y%m%d-%H%M)
SLUG="my-eval-$TS"
mkdir -p ~/dev/vercel-plugin-testing/$SLUG
cd ~/dev/vercel-plugin-testing/$SLUG
npx add-plugin https://github.com/vercel/vercel-plugin -s project -y

# 2. Launch session via WezTerm
wezterm cli spawn --cwd /Users/johnlindquist/dev/vercel-plugin-testing/$SLUG -- /bin/zsh -ic \
  "unset CLAUDECODE; VERCEL_PLUGIN_LOG_LEVEL=debug x '<PROMPT>' --settings .claude/settings.json; exec zsh"

# 3. Find debug log (wait ~25s for session start)
find ~/.claude/debug -name "*.txt" -mmin -2 -exec grep -l "$SLUG" {} +

What to Monitor

Hook firing (all 8 registered hooks)

LOG=~/.claude/debug/<session-id>.txt

# SessionStart (3 hooks)
grep "SessionStart.*success" "$LOG"

# PreToolUse skill injection
grep -c "executePreToolHooks" "$LOG"        # total calls
grep -c "provided additionalContext" "$LOG"  # injections

# UserPromptSubmit
grep "UserPromptSubmit.*success" "$LOG"

# PostToolUse validate + shadcn font-fix
grep "posttooluse-validate.*provided" "$LOG"
grep "PostToolUse:Bash.*success" "$LOG"

# SessionEnd cleanup
grep "SessionEnd" "$LOG"

Dedup correctness (the key metric)

TMPDIR=$(node -e "import {tmpdir} from 'os'; console.log(tmpdir())" --input-type=module)
CLAIMDIR="$TMPDIR/vercel-plugin-<session-id>-seen-skills.d"

# Claim files = one per skill, atomic O_EXCL
ls "$CLAIMDIR"

# Compare: injections should equal claims
inject_meta=$(grep -c "skillInjection:" "$LOG")
claims=$(ls "$CLAIMDIR" 2>/dev/null | wc -l | tr -d ' ')
echo "Injections: $((inject_meta / 3)) | Claims: $claims"

skillInjection: appears 3x per actual injection in the debug log (initial check, parsed, success). Divide by 3.

PostToolUse validate quality

Look for real catches — API key bypass, outdated models, wrong patterns:

grep "VALIDATION" "$LOG" | head -10

Scenario Design

Describe products and features, never name specific technologies. Let the plugin infer which skills to inject. Always end prompts with: "Link the project to my vercel-labs team so we can deploy it later. Skip any planning and just build it. Get the dev server running."

Coverage targets by scenario type

Scenario Type	Skills Exercised
AI chat app	ai-sdk, ai-gateway, nextjs, ai-elements
Durable workflow	workflow, ai-sdk, vercel-queues
Monorepo	turborepo, turbopack, nextjs
Edge auth + routing	routing-middleware, auth, sign-in-with-vercel
Chat bot (multi-platform)	chat-sdk, ai-sdk, vercel-storage
Feature flags + CRM	vercel-flags, vercel-queues, ai-sdk
Email pipeline	email, satori, ai-sdk, vercel-storage
Marketplace/payments	payments, marketplace, cms
Kitchen sink	micro, ncc, all niche skills

Hard-to-trigger skills (8 of 44)

These need explicit technology references in the prompt because agents don't naturally reach for them:

• ai-elements — say "use the AI Elements component registry"
• v0-dev — say "generate components with v0"
• vercel-firewall — say "use Vercel Firewall for rate limiting"
• marketplace — say "publish to the Vercel Marketplace"
• geist — say "install the geist font package"
• json-render — name files components/chat-*.tsx

Coverage Report

Write results to .notes/COVERAGE.md with:

1. Session index — slug, session ID, unique skills, dedup status
2. Hook coverage matrix — which hooks fired in which sessions
3. Skill injection table — which of the 44 skills triggered
4. Dedup stats — injections vs claims per session
5. Issues found — bugs, pattern gaps, validation findings

Cleanup

rm -rf ~/dev/vercel-plugin-testing