gopher-guides

Gopher Guides Professional Training

Access official Gopher Guides training materials via API for authoritative Go best practices.

Important: Always Use --variable/--expand-header Syntax

Do NOT use $VAR or ${VAR} shell expansion in curl commands. Environment variable expansion is unreliable in AI coding assistant shell/bash tools (Claude Code, Codex, etc.). Always use curl's built-in --variable % and --expand-header syntax instead.

Requires curl 8.3+. If you get unknown option: --variable, see the fallback note at the bottom.

Step 1: Verify API Key

curl -s --variable %GOPHER_GUIDES_API_KEY \
  --expand-header "Authorization: Bearer {{GOPHER_GUIDES_API_KEY}}" \
  https://gopherguides.com/api/gopher-ai/me

On success: Display a brief confirmation to the user, then proceed to Step 2:

• "✓ Gopher Guides API: Authenticated as {email} ({tier_category} tier)"

On error or missing key: Help the user configure:

1. Get API key at gopherguides.com
2. Add to shell profile (~/.zshrc or ~/.bashrc): export GOPHER_GUIDES_API_KEY="your-key"
3. Restart your terminal/IDE to pick up the new environment variable

Do NOT provide Go advice without a valid, verified API key.

Step 2: Query the API

Use the cache wrapper script for all API calls. It automatically caches responses (24h for practices/examples, 1h for audit/review) to avoid redundant API calls.

The cache wrapper is at ${CLAUDE_PLUGIN_ROOT}/scripts/cache-api.sh.

For "what's the best way to..." questions

"${CLAUDE_PLUGIN_ROOT}/scripts/cache-api.sh" practices '{"topic": "error handling"}'

For code review/audit

"${CLAUDE_PLUGIN_ROOT}/scripts/cache-api.sh" audit '{"code": "<user code here>", "focus": "error-handling"}'

For "show me an example of..."

"${CLAUDE_PLUGIN_ROOT}/scripts/cache-api.sh" examples '{"topic": "table driven tests"}'

For PR/diff review

"${CLAUDE_PLUGIN_ROOT}/scripts/cache-api.sh" review '{"diff": "<diff output>"}'

Direct API calls (bypassing cache)

If you need to bypass the cache, use curl directly:

curl -s -X POST -H "Authorization: Bearer $GOPHER_GUIDES_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"topic": "error handling"}' \
  https://gopherguides.com/api/gopher-ai/practices

Cache Management

• Cache location: .claude/gopher-guides-cache.json
• Clear cache: Use /clear-cache command
• TTL: 24 hours (practices, examples), 1 hour (audit, review)

Response Handling

The API returns JSON with:

• content: Formatted guidance from training materials
• sources: Module references with similarity scores

Present the content to the user with proper attribution to Gopher Guides.

Topics Covered

The training materials cover:

• Fundamentals: Types, functions, packages, errors
• Testing: Table-driven tests, mocks, benchmarks
• Concurrency: Goroutines, channels, sync, context
• Web Development: HTTP handlers, middleware, APIs
• Database: SQL, ORMs, migrations
• Best Practices: Code organization, error handling, interfaces
• Tooling: go mod, go test, linters, profiling

Fallback for curl < 8.3

If --variable is not supported (curl versions before 8.3), use printf to avoid shell expansion issues:

KEY=$(printenv GOPHER_GUIDES_API_KEY) && curl -s -H "Authorization: Bearer $KEY" https://gopherguides.com/api/gopher-ai/me

Check your curl version with curl --version.

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