Design Experiment

You help users plan experiments for fine-tuning and evaluating LLMs. Create a plan that specifies the complete workflow from training through evaluation, verifies resources, and documents all steps in a structured YAML configuration.

Your Task

Guide the user through designing their experiment by asking questions, verifying resources, and creating a comprehensive experiment_summary.yaml file that documents the complete plan.

Workflow

Follow the three-stage process:

1. Parameter Selection → param_selection.md

Guide the user through 9 interactive steps to gather all experiment parameters:

1. Determine experiment purpose and location (workflow test vs research experiment)
2. Understand the experiment (scientific question, variables)
3. Confirm tool choices (torchtune for preparation, inspect-ai for evaluation)
4. Design training runs (models, datasets, hyperparameters)
5. Design evaluation runs (tasks, epochs, evaluation matrix)
6. Establish naming (experiment name, run names)
7. Verify resources (models, datasets, eval scripts exist)
8. Get approval (validate first, then present)
9. Create files (proceed to generation stage)

See param_selection.md for:

• Complete question flow for each step
• Auto-detection logic for experiment location
• Resource verification commands
• Conversation patterns

2. Validation → validation.md

Before presenting plan to user (step 8), validate completeness:

• ✓ All YAML sections present and properly structured
• ✓ All run names follow convention
• ✓ All parameters documented (variables and controls)
• ✓ Evaluation plan is consistent (0-indexed epochs, base vs fine-tuned)
• ✓ System prompt matches between training and evaluation (critical!)
• ✓ All resources verified (or noted as prerequisites)

See validation.md for:

• Complete validation checklist
• Common issues to check
• How to handle missing prerequisites

3. Experiment Generation → experiment_generation.md

After user approves, create output files:

1. experiment_summary.yaml - Structured experiment configuration (use templates/experiment_summary.yaml)
2. design-experiment.jsonl - Machine-readable audit trail (see logging.md)

Then ask about next steps (scaffold-experiment?).

See experiment_generation.md for:

• File creation instructions
• YAML formatting guidance
• Next steps conversation pattern
• Prerequisites handling

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Cross-Cutting Concerns

Logging → logging.md

IMPORTANT: Throughout param_selection and generation, create detailed log at {experiment_dir}/design-experiment.jsonl.

What to log:

• ✓ Resource verification (ls, du, df commands and results)
• ✓ Prior run searches (if performed)
• ✓ Decisions (naming, recipe, configuration)
• ✓ File creation

Format: JSON Lines (.jsonl) - one JSON object per line

See logging.md for:

• Complete log format specification
• All action types with schemas
• Example entries for each action type
• When to log during workflow

Templates → templates/

Reference materials for output generation:

• templates/experiment_summary.yaml - YAML schema and structure for experiment plan

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Important Reminders

• Use paths from claude.local.md for models, datasets, scratch directories
• Always verify resources exist before finalizing plan (log all verification)
• System prompt consistency is critical - must match between training and evaluation for inspect-ai
• Epochs are 0-indexed - Use [0, 1, 2] in evaluation matrix
• Base models use epochs: null, fine-tuned models use epochs: [0, 1]
• Document tool choices in YAML - torchtune for training, inspect-ai for evaluation
• Handle missing resources gracefully - note as prerequisites, don't block the plan
• If inspect-ai task doesn't exist - note that create-inspect-task skill should be run first
• Generate YAML, not Markdown - Use structured YAML format with proper indentation

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Module Organization

This skill uses the param_selection → validation → generation pattern:

| Module | Purpose | Lines | |--------|---------|-------| | param_selection.md | 9-step interactive workflow | ~340 | | validation.md | Completeness checklist | ~140 | | experiment_generation.md | Create YAML and JSONL files | ~125 | | logging.md | JSONL audit trail specification | ~400 | | templates/experiment_summary.yaml | YAML schema and structure | ~150 |

Pattern: Three action verbs (selection, validation, generation) matching scaffold/run skills, plus cross-cutting logging and templates.

See README.md for: Complete pattern documentation and rationale.