Add deep technical code examples to presentation

[bjacobso]

Summary

Add real DSL and domain code examples from the registry to presentation slides and prompt for deeply technical audiences.

• DAG Workflow DSL: Complete 24-line ETL pipeline with Workflow.make(), demonstrating type-safe workflow orchestration
• Expression Evaluation: CEL integration for production-safe sandboxed expression evaluation in workflow gates
• Schema-Driven Compilation: Multi-target compilation showing one DAG definition → GitHub Actions, AWS Step Functions, Mermaid
• Effect Service Pattern: Dependency injection example without frameworks
• Branded Types & Schema Validation: Compile-time and runtime safety with Effect Schema
• Real Domain Example: Release orchestration workflow showing actual repository patterns

Expanded prompt with technical architecture guidance:

• Deep audience context (algorithms, Effect patterns, trade-offs)
• Complete domain examples (release, ETL, incident response)
• Performance characteristics (O(V+E) validation, topological sort)
• Production trade-offs (CEL vs simple, local vs remote execution)

All code examples pulled from actual registry implementations (effect-dag, effect-expressions, effect-compilers), not pseudo-code.

Test Plan

• View slides.md in Slidev to verify code formatting and progressive disclosure
• Verify all TypeScript examples are syntactically valid (can copy directly from slides)
• Check that code examples reference existing registry implementations
• Confirm prompt.md provides clear technical guidance for presenters
• Review that examples escalate in complexity: simple → compound → real-world

🤖 Generated with Claude Code

[claude]

PR Review: Add Deep Technical Code Examples to Presentation

Summary

This PR significantly enhances the presentation materials by replacing pseudo-code with actual, working code examples from the registry. The additions are well-aligned with the project philosophy and provide deeply technical content suitable for the target audience.

Code Quality & Best Practices ✅

Strengths:

1. Authentic Code Examples: All TypeScript examples are pulled from actual registry implementations:

   • DAG Workflow DSL matches meta-effect/packages/registry/src/effect-dag/dag-workflow.ts:13-39
   • CEL evaluator examples match meta-effect/packages/registry/src/effect-expressions/expr-cel.ts:84-97
   • Multi-target compilation examples match the compiler interfaces
   • Branded types & Schema validation match meta-effect/packages/registry/src/effect-dag/dag-types.ts:35-41, 97-100

2. Accurate Line Counts: The claimed line counts are mostly accurate:

   • ✅ "~80 lines per compiler" - GitHub Actions compiler is 193 lines, Step Functions is 217 lines (slightly higher, but reasonable given complexity)
   • ✅ Mermaid compiler is 81 lines (spot on!)
   • ✅ "60-line CEL wrapper" - expr-cel.ts is 152 lines total, but the core createCELEvaluator function is ~70 lines

3. Progressive Disclosure: Excellent use of Slidev's {all|1-5|7-10} syntax for walking through code step-by-step

4. Consistent Voice: Maintains the "hacker manifesto meets New Yorker cartoon" tone throughout

Potential Issues & Suggestions 🔍

Minor Accuracy Issues

1. Line Count Claims (slides.md:228, 190)

**Write once, run anywhere. ~80 lines per compiler.**
**Sandboxed, production-safe expression evaluation. Copy the 60-line CEL wrapper.**

Issue: The actual line counts are:

• GitHub Actions compiler: 193 lines
• Step Functions compiler: 217 lines
• CEL evaluator: 152 lines total (though core function is ~70 lines)

Suggestion: Either adjust the claims to "~150-200 lines per compiler" or clarify you're referring to the "core logic" rather than full file with types/docs/exports. The philosophy emphasizes transparency, so accuracy matters here.

Documentation & Presentation Quality

2. Example Code Syntax (slides.md:236-237)

// Define service interface
const evaluator = createCELEvaluator()

Issue: The comment "Define service interface" is misleading - this line creates an evaluator instance, not a service interface definition.

Suggestion: Update comment to:

// Create CEL evaluator instance
const evaluator = createCELEvaluator()

3. Release Workflow Example Completeness (slides.md:356-380)

The release workflow example shows Fanout/Fanin patterns, which is great, but the edges definition at slides.md:372-379 shows a complete graph. Consider adding a comment to highlight the parallel execution aspect:

  // Parallel execution branches
  Edge.make("parallel_builds", "build_packages"),
  Edge.make("parallel_builds", "generate_changelog"),

This would better demonstrate the fanout/fanin value proposition.

Performance Considerations ✅

No performance concerns. The presentation materials are static content, and the code examples showcase proper Effect patterns:

• Parallel execution with Effect.all() (slides.md:215-219)
• Service pattern for DI (slides.md:240-261)
• Branded types for compile-time safety (slides.md:276-280)

Security Concerns ✅

Excellent security messaging:

• Correctly emphasizes CEL as "sandboxed, production-safe" (slides.md:190)
• Highlights the trade-off: "Simple evaluator: Fast, zero deps, UNSAFE (use in dev only)" vs "CEL evaluator: Sandboxed, industry standard, safe for prod" (prompt.md:362-363)
• Shows secrets handling in release workflow example (slides.md:370)

Test Coverage 📋

Not applicable - This PR modifies presentation materials only, not executable code. However:

Observation: The PR description mentions a test plan with checkboxes:

• View slides.md in Slidev to verify code formatting
• Verify all TypeScript examples are syntactically valid
• Check that code examples reference existing registry implementations
• Confirm prompt.md provides clear technical guidance

Recommendation: Before merging, ensure you've manually verified these items, especially running Slidev to check formatting with the progressive disclosure syntax.

Alignment with CLAUDE.md ✅

This PR follows the project guidelines excellently:

1. ✅ Effect-First: All examples show Effect patterns
2. ✅ Educational: Code examples teach by demonstration (as required by CLAUDE.md:38)
3. ✅ Zero Magic: Examples are transparent, showing complete workflows
4. ✅ Registry as Product: Emphasizes vendorable components (CLAUDE.md:17-18)
5. ✅ Component Size Discipline: Stays true to ~50-100 line philosophy in messaging

Architecture & Design Decisions ✅

Strengths:

1. Deep technical content appropriate for the "deeply technical developers" audience (prompt.md:285-299)
2. Includes algorithmic complexity notes: "O(V + E) via DFS cycle detection" (prompt.md:345)
3. Shows multi-target compilation pattern clearly (slides.md:197-224)
4. Demonstrates Effect service pattern without frameworks (slides.md:234-268)

Final Recommendations

Must Address Before Merge:

1. Fix the misleading comment on slides.md:236-237 ("Define service interface" → "Create CEL evaluator instance")

Should Address (Lower Priority):

2. Clarify line counts to match actual implementation (or note you're referring to "core logic")
3. Verify test plan checklist - especially Slidev rendering with the {all|1-5|7-10} syntax

Optional Enhancements:

4. Add a comment highlighting parallel execution in the Release Workflow example
5. Consider adding a slide showing the actual file structure of a vendored component (with line numbers visible)

Verdict

✅ Approve with Minor Revisions

This is a high-quality PR that significantly improves the presentation by grounding it in real, working code. The additions are authentic, technically accurate, and well-aligned with the project's philosophy of transparency and education.

The issues identified are minor and mostly about precision in messaging (line counts, comment accuracy). The core contribution—replacing pseudo-code with actual registry code—is exactly what this project needs for technical audiences.

Great work! 🚀

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Review completed by Claude Code following CLAUDE.md guidelines for vendorable components and Effect-first architecture.